diff --git a/include/swift/APIDigester/ModuleAnalyzerNodes.h b/include/swift/APIDigester/ModuleAnalyzerNodes.h
index e0e3fb682bba1..ba816dd25722b 100644
--- a/include/swift/APIDigester/ModuleAnalyzerNodes.h
+++ b/include/swift/APIDigester/ModuleAnalyzerNodes.h
@@ -339,6 +339,7 @@ struct PlatformIntroVersion {
 class SDKNodeDecl: public SDKNode {
   DeclKind DKind;
   StringRef Usr;
+  StringRef MangledName;
   SourceLoc Loc;
   StringRef Location;
   StringRef ModuleName;
@@ -463,6 +464,7 @@ class SDKNodeType: public SDKNode {
 
 class SDKNodeTypeNominal : public SDKNodeType {
   StringRef USR;
+  StringRef MangledName;
 public:
   SDKNodeTypeNominal(SDKNodeInitInfo Info);
   // Get the usr of the correspoding nominal type decl.
@@ -583,6 +585,7 @@ class SDKNodeDeclType: public SDKNodeDecl {
 /// in the conformance, thus getName() will give us the name of the protocol.
 class SDKNodeConformance: public SDKNode {
   StringRef Usr;
+  StringRef MangledName;
   SDKNodeDeclType *TypeDecl;
   friend class SDKNodeDeclType;
   bool IsABIPlaceholder;
diff --git a/include/swift/AST/ASTMangler.h b/include/swift/AST/ASTMangler.h
index fc165eea39fa9..08fdac734613d 100644
--- a/include/swift/AST/ASTMangler.h
+++ b/include/swift/AST/ASTMangler.h
@@ -267,6 +267,7 @@ class ASTMangler : public Mangler {
 
   std::string mangleTypeAsContextUSR(const NominalTypeDecl *type);
 
+  std::string mangleAnyDecl(const ValueDecl *Decl, bool prefix);
   std::string mangleDeclAsUSR(const ValueDecl *Decl, StringRef USRPrefix);
 
   std::string mangleAccessorEntityAsUSR(AccessorKind kind,
diff --git a/include/swift/IDE/DigesterEnums.def b/include/swift/IDE/DigesterEnums.def
index b58b49fe0b471..3dd94674f4b12 100644
--- a/include/swift/IDE/DigesterEnums.def
+++ b/include/swift/IDE/DigesterEnums.def
@@ -142,6 +142,7 @@ KEY(kind)
 KEY_STRING(Name, name)
 KEY_STRING(PrintedName, printedName)
 KEY_STRING(Usr, usr)
+KEY_STRING(MangledName, mangledName)
 KEY_STRING(Location, location)
 KEY_STRING(ModuleName, moduleName)
 KEY_STRING(SuperclassUsr, superclassUsr)
diff --git a/lib/APIDigester/ModuleAnalyzerNodes.cpp b/lib/APIDigester/ModuleAnalyzerNodes.cpp
index 4fab30f60ea7d..bd9a7679bf61d 100644
--- a/lib/APIDigester/ModuleAnalyzerNodes.cpp
+++ b/lib/APIDigester/ModuleAnalyzerNodes.cpp
@@ -1,6 +1,7 @@
 #include "llvm/ADT/STLExtras.h"
 #include "swift/Basic/Defer.h"
 #include "swift/SIL/SILDeclRef.h"
+#include "swift/AST/ASTMangler.h"
 #include <swift/APIDigester/ModuleAnalyzerNodes.h>
 #include <algorithm>
 
@@ -98,7 +99,8 @@ SDKNodeRoot::SDKNodeRoot(SDKNodeInitInfo Info): SDKNode(Info, SDKNodeKind::Root)
   JsonFormatVer(Info.JsonFormatVer.hasValue() ? *Info.JsonFormatVer : DIGESTER_JSON_DEFAULT_VERSION) {}
 
 SDKNodeDecl::SDKNodeDecl(SDKNodeInitInfo Info, SDKNodeKind Kind)
-      : SDKNode(Info, Kind), DKind(Info.DKind), Usr(Info.Usr), Loc(Info.Loc),
+      : SDKNode(Info, Kind), DKind(Info.DKind), Usr(Info.Usr),
+        MangledName(Info.MangledName), Loc(Info.Loc),
         Location(Info.Location), ModuleName(Info.ModuleName),
         DeclAttributes(Info.DeclAttrs), IsImplicit(Info.IsImplicit),
         IsStatic(Info.IsStatic), IsDeprecated(Info.IsDeprecated),
@@ -120,7 +122,8 @@ SDKNodeType::SDKNodeType(SDKNodeInitInfo Info, SDKNodeKind Kind):
   ParamValueOwnership(Info.ParamValueOwnership) {}
 
 SDKNodeTypeNominal::SDKNodeTypeNominal(SDKNodeInitInfo Info):
-  SDKNodeType(Info, SDKNodeKind::TypeNominal), USR(Info.Usr) {}
+  SDKNodeType(Info, SDKNodeKind::TypeNominal), USR(Info.Usr),
+  MangledName(Info.MangledName) {}
 
 SDKNodeTypeFunc::SDKNodeTypeFunc(SDKNodeInitInfo Info):
   SDKNodeType(Info, SDKNodeKind::TypeFunc) {}
@@ -139,7 +142,8 @@ SDKNodeDeclType::SDKNodeDeclType(SDKNodeInitInfo Info):
 
 SDKNodeConformance::SDKNodeConformance(SDKNodeInitInfo Info):
   SDKNode(Info, SDKNodeKind::Conformance),
-  Usr(Info.Usr), IsABIPlaceholder(Info.IsABIPlaceholder) {}
+  Usr(Info.Usr), MangledName(Info.MangledName),
+  IsABIPlaceholder(Info.IsABIPlaceholder) {}
 
 SDKNodeTypeWitness::SDKNodeTypeWitness(SDKNodeInitInfo Info):
   SDKNode(Info, SDKNodeKind::TypeWitness) {}
@@ -1036,6 +1040,18 @@ static StringRef calculateUsr(SDKContext &Ctx, ValueDecl *VD) {
   return StringRef();
 }
 
+static StringRef calculateMangledName(SDKContext &Ctx, ValueDecl *VD) {
+  if (isFromClang(VD)) {
+    // Don't mangle clang symbols.
+    return StringRef();
+  }
+  if (auto *attr = VD->getAttrs().getAttribute<SILGenNameAttr>()) {
+    return Ctx.buffer(attr->Name);
+  }
+  Mangle::ASTMangler NewMangler;
+  return Ctx.buffer(NewMangler.mangleAnyDecl(VD, true));
+}
+
 static StringRef calculateLocation(SDKContext &SDKCtx, Decl *D) {
   if (SDKCtx.getOpts().AvoidLocation)
     return StringRef();
@@ -1298,6 +1314,7 @@ SDKNodeInitInfo::SDKNodeInitInfo(SDKContext &Ctx, Type Ty, TypeInitInfo Info) :
   // If this is a nominal type, get its Usr.
   if (auto *ND = Ty->getAnyNominal()) {
     Usr = calculateUsr(Ctx, ND);
+    MangledName = calculateMangledName(Ctx, ND);
   }
 }
 
@@ -1415,6 +1432,7 @@ SDKNodeInitInfo::SDKNodeInitInfo(SDKContext &Ctx, ValueDecl *VD)
   Name = getSimpleName(VD);
   PrintedName = getPrintedName(Ctx, VD);
   Usr = calculateUsr(Ctx, VD);
+  MangledName = calculateMangledName(Ctx, VD);
   IsThrowing = isFuncThrowing(VD);
   IsStatic = VD->isStatic();
   IsOverriding = VD->getOverriddenDecl();
@@ -1970,6 +1988,7 @@ void SDKNodeRoot::jsonize(json::Output &out) {
 void SDKNodeConformance::jsonize(json::Output &out) {
   SDKNode::jsonize(out);
   output(out, KeyKind::KK_usr, Usr);
+  output(out, KeyKind::KK_mangledName, MangledName);
   output(out, KeyKind::KK_isABIPlaceholder, IsABIPlaceholder);
 }
 
@@ -1977,6 +1996,7 @@ void SDKNodeDecl::jsonize(json::Output &out) {
   SDKNode::jsonize(out);
   out.mapRequired(getKeyContent(Ctx, KeyKind::KK_declKind).data(), DKind);
   output(out, KeyKind::KK_usr, Usr);
+  output(out, KeyKind::KK_mangledName, MangledName);
   output(out, KeyKind::KK_location, Location);
   output(out, KeyKind::KK_moduleName, ModuleName);
   output(out, KeyKind::KK_genericSig, GenericSig);
diff --git a/lib/AST/ASTMangler.cpp b/lib/AST/ASTMangler.cpp
index bc1b0a62e1ff3..5ba426d77a35e 100644
--- a/lib/AST/ASTMangler.cpp
+++ b/lib/AST/ASTMangler.cpp
@@ -742,16 +742,14 @@ std::string ASTMangler::mangleTypeAsUSR(Type Ty) {
   return finalize();
 }
 
-std::string ASTMangler::mangleDeclAsUSR(const ValueDecl *Decl,
-                                        StringRef USRPrefix) {
-#if SWIFT_BUILD_ONLY_SYNTAXPARSERLIB
-  return std::string(); // not needed for the parser library.
-#endif
-
+std::string ASTMangler::mangleAnyDecl(const ValueDecl *Decl, bool prefix) {
   DWARFMangling = true;
-  beginManglingWithoutPrefix();
+  if (prefix) {
+    beginMangling();
+  } else {
+    beginManglingWithoutPrefix();
+  }
   llvm::SaveAndRestore<bool> allowUnnamedRAII(AllowNamelessEntities, true);
-  Buffer << USRPrefix;
 
   auto Sig = Decl->getInnermostDeclContext()->getGenericSignatureOfContext();
   bindGenericParameters(Sig);
@@ -773,10 +771,18 @@ std::string ASTMangler::mangleDeclAsUSR(const ValueDecl *Decl,
   // We have a custom prefix, so finalize() won't verify for us. If we're not
   // in invalid code (coming from an IDE caller) verify manually.
   if (!Decl->isInvalid())
-    verify(Storage.str().drop_front(USRPrefix.size()));
+    verify(Storage.str());
   return finalize();
 }
 
+std::string ASTMangler::mangleDeclAsUSR(const ValueDecl *Decl,
+                                        StringRef USRPrefix) {
+#if SWIFT_BUILD_ONLY_SYNTAXPARSERLIB
+  return std::string(); // not needed for the parser library.
+#endif
+  return (llvm::Twine(USRPrefix) + mangleAnyDecl(Decl, false)).str();
+}
+
 std::string ASTMangler::mangleAccessorEntityAsUSR(AccessorKind kind,
                                                   const AbstractStorageDecl *decl,
                                                   StringRef USRPrefix,
diff --git a/test/api-digester/Inputs/cake.swift b/test/api-digester/Inputs/cake.swift
index b1728b6f61d48..210c7d98ed71b 100644
--- a/test/api-digester/Inputs/cake.swift
+++ b/test/api-digester/Inputs/cake.swift
@@ -142,3 +142,6 @@ extension SwiftObjcClass {
 
 @_alwaysEmitIntoClient
 public func emitIntoClientFunc() {}
+
+@_silgen_name("silgenName")
+public func silgenNamedFunc() {}
diff --git a/test/api-digester/Outputs/cake-abi.json b/test/api-digester/Outputs/cake-abi.json
index 46b2e407e05b2..6fa91fce54507 100644
--- a/test/api-digester/Outputs/cake-abi.json
+++ b/test/api-digester/Outputs/cake-abi.json
@@ -58,6 +58,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2P1PAAE1poiyAaB_pAaB_p_AaB_ptFZ",
+          "mangledName": "$s4cake2P1PAAE1poiyAaB_pAaB_p_AaB_ptFZ",
           "moduleName": "cake",
           "genericSig": "<τ_0_0 where τ_0_0 : cake.P1>",
           "sugared_genericSig": "<Self where Self : cake.P1>",
@@ -67,6 +68,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake2P1P",
+      "mangledName": "$s4cake2P1P",
       "moduleName": "cake"
     },
     {
@@ -75,6 +77,7 @@
       "printedName": "P2",
       "declKind": "Protocol",
       "usr": "s:4cake2P2P",
+      "mangledName": "$s4cake2P2P",
       "moduleName": "cake"
     },
     {
@@ -83,6 +86,7 @@
       "printedName": "P3",
       "declKind": "Protocol",
       "usr": "s:4cake2P3P",
+      "mangledName": "$s4cake2P3P",
       "moduleName": "cake",
       "genericSig": "<τ_0_0 : cake.P1, τ_0_0 : cake.P2>",
       "sugared_genericSig": "<Self : cake.P1, Self : cake.P2>",
@@ -91,13 +95,15 @@
           "kind": "Conformance",
           "name": "P2",
           "printedName": "P2",
-          "usr": "s:4cake2P2P"
+          "usr": "s:4cake2P2P",
+          "mangledName": "$s4cake2P2P"
         },
         {
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         }
       ]
     },
@@ -119,6 +125,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2S1V4foo1yyFZ",
+          "mangledName": "$s4cake2S1V4foo1yyFZ",
           "moduleName": "cake",
           "static": true,
           "funcSelfKind": "NonMutating"
@@ -136,6 +143,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2S1V4foo2yyF",
+          "mangledName": "$s4cake2S1V4foo2yyF",
           "moduleName": "cake",
           "funcSelfKind": "Mutating"
         },
@@ -152,12 +160,14 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2S1V4foo6yyF",
+          "mangledName": "$s4cake2S1V4foo6yyF",
           "moduleName": "cake",
           "funcSelfKind": "NonMutating"
         }
       ],
       "declKind": "Struct",
       "usr": "s:4cake2S1V",
+      "mangledName": "$s4cake2S1V",
       "moduleName": "cake",
       "declAttributes": [
         "Frozen"
@@ -167,19 +177,22 @@
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         },
         {
           "kind": "Conformance",
           "name": "Sendable",
           "printedName": "Sendable",
-          "usr": "s:s8SendableP"
+          "usr": "s:s8SendableP",
+          "mangledName": "$ss8SendableP"
         },
         {
           "kind": "Conformance",
           "name": "P2",
           "printedName": "P2",
-          "usr": "s:4cake2P2P"
+          "usr": "s:4cake2P2P",
+          "mangledName": "$s4cake2P2P"
         }
       ]
     },
@@ -201,6 +214,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2C0CA2A2S1VRszAERs_AERs0_rlE17conditionalFooExtyyF",
+          "mangledName": "$s4cake2C0CA2A2S1VRszAERs_AERs0_rlE17conditionalFooExtyyF",
           "moduleName": "cake",
           "genericSig": "<τ_0_0, τ_0_1, τ_0_2 where τ_0_0 == cake.S1, τ_0_1 == cake.S1, τ_0_2 == cake.S1>",
           "sugared_genericSig": "<T1, T2, T3 where T1 == cake.S1, T2 == cake.S1, T3 == cake.S1>",
@@ -219,6 +233,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2C0C19unconditionalFooExtyyF",
+          "mangledName": "$s4cake2C0C19unconditionalFooExtyyF",
           "moduleName": "cake",
           "genericSig": "<τ_0_0, τ_0_1, τ_0_2>",
           "sugared_genericSig": "<T1, T2, T3>",
@@ -227,6 +242,7 @@
       ],
       "declKind": "Class",
       "usr": "s:4cake2C0C",
+      "mangledName": "$s4cake2C0C",
       "moduleName": "cake",
       "genericSig": "<τ_0_0, τ_0_1, τ_0_2>",
       "sugared_genericSig": "<T1, T2, T3>",
@@ -250,6 +266,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2C1C4foo1yyFZ",
+          "mangledName": "$s4cake2C1C4foo1yyFZ",
           "moduleName": "cake",
           "static": true,
           "funcSelfKind": "NonMutating"
@@ -267,6 +284,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake2C1C3InsACSgvp",
+          "mangledName": "$s4cake2C1C3InsACSgvp",
           "moduleName": "cake",
           "declAttributes": [
             "HasInitialValue",
@@ -299,6 +317,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C3InsACSgvg",
+              "mangledName": "$s4cake2C1C3InsACSgvg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -333,6 +352,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C3InsACSgvs",
+              "mangledName": "$s4cake2C1C3InsACSgvs",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -353,6 +373,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C3InsACSgvM",
+              "mangledName": "$s4cake2C1C3InsACSgvM",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -375,6 +396,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake2C1C4Ins2ACvp",
+          "mangledName": "$s4cake2C1C4Ins2ACvp",
           "moduleName": "cake",
           "declAttributes": [
             "HasInitialValue",
@@ -399,6 +421,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C4Ins2ACvg",
+              "mangledName": "$s4cake2C1C4Ins2ACvg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -425,6 +448,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C4Ins2ACvs",
+              "mangledName": "$s4cake2C1C4Ins2ACvs",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -445,6 +469,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C4Ins2ACvM",
+              "mangledName": "$s4cake2C1C4Ins2ACvM",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -457,6 +482,7 @@
       ],
       "declKind": "Class",
       "usr": "s:4cake2C1C",
+      "mangledName": "$s4cake2C1C",
       "moduleName": "cake",
       "superclassUsr": "s:4cake2C0C",
       "hasMissingDesignatedInitializers": true,
@@ -491,6 +517,7 @@
       ],
       "declKind": "Func",
       "usr": "s:4cake4foo1_1bySi_AA2S1VtF",
+      "mangledName": "$s4cake4foo1_1bySi_AA2S1VtF",
       "moduleName": "cake",
       "funcSelfKind": "NonMutating"
     },
@@ -520,6 +547,7 @@
       ],
       "declKind": "Func",
       "usr": "s:4cake4foo2_1bySi_AA2S1VtF",
+      "mangledName": "$s4cake4foo2_1bySi_AA2S1VtF",
       "moduleName": "cake",
       "funcSelfKind": "NonMutating"
     },
@@ -562,6 +590,7 @@
           ],
           "declKind": "EnumElement",
           "usr": "s:4cake6NumberO3oneyA2CmF",
+          "mangledName": "$s4cake6NumberO3oneyA2CmF",
           "moduleName": "cake",
           "fixedbinaryorder": 0
         },
@@ -593,6 +622,7 @@
           ],
           "declKind": "Constructor",
           "usr": "s:4cake6NumberO8rawValueACSgSi_tcfc",
+          "mangledName": "$s4cake6NumberO8rawValueACSgSi_tcfc",
           "moduleName": "cake",
           "implicit": true,
           "declAttributes": [
@@ -614,6 +644,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake6NumberO8rawValueSivp",
+          "mangledName": "$s4cake6NumberO8rawValueSivp",
           "moduleName": "cake",
           "implicit": true,
           "accessors": [
@@ -631,6 +662,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake6NumberO8rawValueSivg",
+              "mangledName": "$s4cake6NumberO8rawValueSivg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -643,6 +675,7 @@
       ],
       "declKind": "Enum",
       "usr": "s:4cake6NumberO",
+      "mangledName": "$s4cake6NumberO",
       "moduleName": "cake",
       "enumRawTypeName": "Int",
       "isEnumExhaustive": true,
@@ -651,13 +684,15 @@
           "kind": "Conformance",
           "name": "Equatable",
           "printedName": "Equatable",
-          "usr": "s:SQ"
+          "usr": "s:SQ",
+          "mangledName": "$sSQ"
         },
         {
           "kind": "Conformance",
           "name": "Hashable",
           "printedName": "Hashable",
-          "usr": "s:SH"
+          "usr": "s:SH",
+          "mangledName": "$sSH"
         },
         {
           "kind": "Conformance",
@@ -678,7 +713,8 @@
               ]
             }
           ],
-          "usr": "s:SY"
+          "usr": "s:SY",
+          "mangledName": "$sSY"
         }
       ]
     },
@@ -715,6 +751,7 @@
       ],
       "declKind": "Func",
       "usr": "s:4cake4foo3yySDySiSSGF",
+      "mangledName": "$s4cake4foo3yySDySiSSGF",
       "moduleName": "cake",
       "funcSelfKind": "NonMutating"
     },
@@ -737,6 +774,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake17fixedLayoutStructV1aSivp",
+          "mangledName": "$s4cake17fixedLayoutStructV1aSivp",
           "moduleName": "cake",
           "declAttributes": [
             "HasInitialValue",
@@ -759,6 +797,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake17fixedLayoutStructV1aSivg",
+              "mangledName": "$s4cake17fixedLayoutStructV1aSivg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -785,6 +824,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake17fixedLayoutStructV1aSivs",
+              "mangledName": "$s4cake17fixedLayoutStructV1aSivs",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -805,6 +845,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake17fixedLayoutStructV1aSivM",
+              "mangledName": "$s4cake17fixedLayoutStructV1aSivM",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -828,6 +869,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake17fixedLayoutStructV1b33_3D8926C30F7417F2EF9A277D0C73FBDBLLSivp",
+          "mangledName": "$s4cake17fixedLayoutStructV1b33_3D8926C30F7417F2EF9A277D0C73FBDBLLSivp",
           "moduleName": "cake",
           "isInternal": true,
           "declAttributes": [
@@ -851,6 +893,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake17fixedLayoutStructV1cSivp",
+          "mangledName": "$s4cake17fixedLayoutStructV1cSivp",
           "moduleName": "cake",
           "isInternal": true,
           "declAttributes": [
@@ -874,6 +917,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake17fixedLayoutStructV19unavailablePropertySivp",
+          "mangledName": "$s4cake17fixedLayoutStructV19unavailablePropertySivp",
           "moduleName": "cake",
           "declAttributes": [
             "HasInitialValue",
@@ -898,6 +942,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake17fixedLayoutStructV19unavailablePropertySivg",
+              "mangledName": "$s4cake17fixedLayoutStructV19unavailablePropertySivg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -910,6 +955,7 @@
       ],
       "declKind": "Struct",
       "usr": "s:4cake17fixedLayoutStructV",
+      "mangledName": "$s4cake17fixedLayoutStructV",
       "moduleName": "cake",
       "declAttributes": [
         "Frozen"
@@ -919,7 +965,8 @@
           "kind": "Conformance",
           "name": "Sendable",
           "printedName": "Sendable",
-          "usr": "s:s8SendableP"
+          "usr": "s:s8SendableP",
+          "mangledName": "$ss8SendableP"
         }
       ]
     },
@@ -934,6 +981,7 @@
           "printedName": "A",
           "declKind": "AssociatedType",
           "usr": "s:4cake21ProWithAssociatedTypeP1AQa",
+          "mangledName": "$s4cake21ProWithAssociatedTypeP1AQa",
           "moduleName": "cake",
           "protocolReq": true
         },
@@ -951,6 +999,7 @@
           ],
           "declKind": "AssociatedType",
           "usr": "s:4cake21ProWithAssociatedTypeP1BQa",
+          "mangledName": "$s4cake21ProWithAssociatedTypeP1BQa",
           "moduleName": "cake",
           "protocolReq": true
         },
@@ -967,6 +1016,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake21ProWithAssociatedTypePAAE10NonReqFuncyyF",
+          "mangledName": "$s4cake21ProWithAssociatedTypePAAE10NonReqFuncyyF",
           "moduleName": "cake",
           "genericSig": "<τ_0_0 where τ_0_0 : cake.ProWithAssociatedType>",
           "sugared_genericSig": "<Self where Self : cake.ProWithAssociatedType>",
@@ -986,6 +1036,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake21ProWithAssociatedTypePAAE9NonReqVarSivp",
+          "mangledName": "$s4cake21ProWithAssociatedTypePAAE9NonReqVarSivp",
           "moduleName": "cake",
           "accessors": [
             {
@@ -1002,6 +1053,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake21ProWithAssociatedTypePAAE9NonReqVarSivg",
+              "mangledName": "$s4cake21ProWithAssociatedTypePAAE9NonReqVarSivg",
               "moduleName": "cake",
               "genericSig": "<τ_0_0 where τ_0_0 : cake.ProWithAssociatedType>",
               "sugared_genericSig": "<Self where Self : cake.ProWithAssociatedType>",
@@ -1012,6 +1064,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake21ProWithAssociatedTypeP",
+      "mangledName": "$s4cake21ProWithAssociatedTypeP",
       "moduleName": "cake"
     },
     {
@@ -1039,6 +1092,7 @@
           ],
           "declKind": "Subscript",
           "usr": "s:4cake13SubsContainerP6getterS2i_tcip",
+          "mangledName": "$s4cake13SubsContainerP6getterS2i_tcip",
           "moduleName": "cake",
           "genericSig": "<τ_0_0 where τ_0_0 : cake.SubsContainer>",
           "sugared_genericSig": "<Self where Self : cake.SubsContainer>",
@@ -1064,6 +1118,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake13SubsContainerP6getterS2i_tcig",
+              "mangledName": "$s4cake13SubsContainerP6getterS2i_tcig",
               "moduleName": "cake",
               "genericSig": "<τ_0_0 where τ_0_0 : cake.SubsContainer>",
               "sugared_genericSig": "<Self where Self : cake.SubsContainer>",
@@ -1093,6 +1148,7 @@
           ],
           "declKind": "Subscript",
           "usr": "s:4cake13SubsContainerP6setterS2i_tcip",
+          "mangledName": "$s4cake13SubsContainerP6setterS2i_tcip",
           "moduleName": "cake",
           "genericSig": "<τ_0_0 where τ_0_0 : cake.SubsContainer>",
           "sugared_genericSig": "<Self where Self : cake.SubsContainer>",
@@ -1118,6 +1174,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake13SubsContainerP6setterS2i_tcig",
+              "mangledName": "$s4cake13SubsContainerP6setterS2i_tcig",
               "moduleName": "cake",
               "genericSig": "<τ_0_0 where τ_0_0 : cake.SubsContainer>",
               "sugared_genericSig": "<Self where Self : cake.SubsContainer>",
@@ -1150,6 +1207,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake13SubsContainerP6setterS2i_tcis",
+              "mangledName": "$s4cake13SubsContainerP6setterS2i_tcis",
               "moduleName": "cake",
               "genericSig": "<τ_0_0 where τ_0_0 : cake.SubsContainer>",
               "sugared_genericSig": "<Self where Self : cake.SubsContainer>",
@@ -1176,6 +1234,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake13SubsContainerP6setterS2i_tciM",
+              "mangledName": "$s4cake13SubsContainerP6setterS2i_tciM",
               "moduleName": "cake",
               "genericSig": "<τ_0_0 where τ_0_0 : cake.SubsContainer>",
               "sugared_genericSig": "<Self where Self : cake.SubsContainer>",
@@ -1189,6 +1248,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake13SubsContainerP",
+      "mangledName": "$s4cake13SubsContainerP",
       "moduleName": "cake"
     },
     {
@@ -1202,6 +1262,7 @@
           "printedName": "T",
           "declKind": "AssociatedType",
           "usr": "s:4cake6PSuperP1TQa",
+          "mangledName": "$s4cake6PSuperP1TQa",
           "moduleName": "cake",
           "protocolReq": true
         },
@@ -1218,6 +1279,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake6PSuperP3fooyyF",
+          "mangledName": "$s4cake6PSuperP3fooyyF",
           "moduleName": "cake",
           "genericSig": "<τ_0_0 where τ_0_0 : cake.PSuper>",
           "sugared_genericSig": "<Self where Self : cake.PSuper>",
@@ -1238,6 +1300,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake6PSuperPAAE9futureFooyyF",
+          "mangledName": "$s4cake6PSuperPAAE9futureFooyyF",
           "moduleName": "cake",
           "genericSig": "<τ_0_0 where τ_0_0 : cake.PSuper>",
           "sugared_genericSig": "<Self where Self : cake.PSuper>",
@@ -1246,6 +1309,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake6PSuperP",
+      "mangledName": "$s4cake6PSuperP",
       "moduleName": "cake"
     },
     {
@@ -1259,6 +1323,7 @@
           "printedName": "T",
           "declKind": "AssociatedType",
           "usr": "s:4cake4PSubP1TQa",
+          "mangledName": "$s4cake4PSubP1TQa",
           "moduleName": "cake",
           "protocolReq": true,
           "overriding": true
@@ -1276,6 +1341,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake4PSubP3fooyyF",
+          "mangledName": "$s4cake4PSubP3fooyyF",
           "moduleName": "cake",
           "genericSig": "<τ_0_0 where τ_0_0 : cake.PSub>",
           "sugared_genericSig": "<Self where Self : cake.PSub>",
@@ -1289,6 +1355,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake4PSubP",
+      "mangledName": "$s4cake4PSubP",
       "moduleName": "cake",
       "genericSig": "<τ_0_0 : cake.PSuper>",
       "sugared_genericSig": "<Self : cake.PSuper>",
@@ -1297,7 +1364,8 @@
           "kind": "Conformance",
           "name": "PSuper",
           "printedName": "PSuper",
-          "usr": "s:4cake6PSuperP"
+          "usr": "s:4cake6PSuperP",
+          "mangledName": "$s4cake6PSuperP"
         }
       ]
     },
@@ -1315,6 +1383,7 @@
       ],
       "declKind": "Var",
       "usr": "s:4cake9GlobalVarSivp",
+      "mangledName": "$s4cake9GlobalVarSivp",
       "moduleName": "cake",
       "declAttributes": [
         "HasInitialValue",
@@ -1352,6 +1421,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake21UsableFromInlineClassC4Prop33_3D8926C30F7417F2EF9A277D0C73FBDBLLSivp",
+          "mangledName": "$s4cake21UsableFromInlineClassC4Prop33_3D8926C30F7417F2EF9A277D0C73FBDBLLSivp",
           "moduleName": "cake",
           "isInternal": true,
           "declAttributes": [
@@ -1364,6 +1434,7 @@
       ],
       "declKind": "Class",
       "usr": "s:4cake21UsableFromInlineClassC",
+      "mangledName": "$s4cake21UsableFromInlineClassC",
       "moduleName": "cake",
       "declAttributes": [
         "FixedLayout",
@@ -1389,6 +1460,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake15FutureContainerC9futureFooyyF",
+          "mangledName": "$s4cake15FutureContainerC9futureFooyyF",
           "moduleName": "cake",
           "intro_Macosx": "10.15",
           "intro_iOS": "13",
@@ -1415,6 +1487,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake15FutureContainerC12NotfutureFooyyF",
+          "mangledName": "$s4cake15FutureContainerC12NotfutureFooyyF",
           "moduleName": "cake",
           "intro_Macosx": "10.15",
           "declAttributes": [
@@ -1425,6 +1498,7 @@
       ],
       "declKind": "Class",
       "usr": "s:4cake15FutureContainerC",
+      "mangledName": "$s4cake15FutureContainerC",
       "moduleName": "cake",
       "hasMissingDesignatedInitializers": true,
       "conformances": [
@@ -1432,13 +1506,15 @@
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         },
         {
           "kind": "Conformance",
           "name": "P2",
           "printedName": "P2",
-          "usr": "s:4cake2P2P"
+          "usr": "s:4cake2P2P",
+          "mangledName": "$s4cake2P2P"
         }
       ]
     },
@@ -1448,6 +1524,7 @@
       "printedName": "PlatformIntroClass",
       "declKind": "Class",
       "usr": "s:4cake18PlatformIntroClassC",
+      "mangledName": "$s4cake18PlatformIntroClassC",
       "moduleName": "cake",
       "intro_Macosx": "10.1",
       "intro_iOS": "10.2",
@@ -1467,6 +1544,7 @@
       "printedName": "SwiftIntroClass",
       "declKind": "Class",
       "usr": "s:4cake15SwiftIntroClassC",
+      "mangledName": "$s4cake15SwiftIntroClassC",
       "moduleName": "cake",
       "intro_swift": "5",
       "declAttributes": [
@@ -1510,6 +1588,7 @@
           ],
           "declKind": "Func",
           "usr": "c:@M@cake@objc(cs)NewObjCClass(im)ObjCFool:ObjCA:ObjCB:",
+          "mangledName": "$s4cake14SwiftObjcClassC3foo1a1b1cySi_S2itF",
           "moduleName": "cake",
           "objc_name": "ObjCFool:ObjCA:ObjCB:",
           "declAttributes": [
@@ -1520,6 +1599,7 @@
       ],
       "declKind": "Class",
       "usr": "c:@M@cake@objc(cs)NewObjCClass",
+      "mangledName": "$s4cake14SwiftObjcClassC",
       "moduleName": "cake",
       "objc_name": "NewObjCClass",
       "declAttributes": [
@@ -1527,6 +1607,26 @@
       ],
       "hasMissingDesignatedInitializers": true
     },
+    {
+      "kind": "Function",
+      "name": "silgenNamedFunc",
+      "printedName": "silgenNamedFunc()",
+      "children": [
+        {
+          "kind": "TypeNominal",
+          "name": "Void",
+          "printedName": "()"
+        }
+      ],
+      "declKind": "Func",
+      "usr": "s:4cake15silgenNamedFuncyyF",
+      "mangledName": "silgenName",
+      "moduleName": "cake",
+      "declAttributes": [
+        "SILGenName"
+      ],
+      "funcSelfKind": "NonMutating"
+    },
     {
       "kind": "TypeDecl",
       "name": "Int",
@@ -1545,6 +1645,7 @@
           ],
           "declKind": "Func",
           "usr": "s:Si4cakeE3fooyyF",
+          "mangledName": "$sSi4cakeE3fooyyF",
           "moduleName": "cake",
           "funcSelfKind": "NonMutating"
         },
@@ -1561,12 +1662,14 @@
           ],
           "declKind": "Func",
           "usr": "s:Si4cakeE3baryyF",
+          "mangledName": "$sSi4cakeE3baryyF",
           "moduleName": "cake",
           "funcSelfKind": "NonMutating"
         }
       ],
       "declKind": "Struct",
       "usr": "s:Si",
+      "mangledName": "$sSi",
       "moduleName": "Swift",
       "declAttributes": [
         "Frozen"
@@ -1577,19 +1680,22 @@
           "kind": "Conformance",
           "name": "FixedWidthInteger",
           "printedName": "FixedWidthInteger",
-          "usr": "s:s17FixedWidthIntegerP"
+          "usr": "s:s17FixedWidthIntegerP",
+          "mangledName": "$ss17FixedWidthIntegerP"
         },
         {
           "kind": "Conformance",
           "name": "SignedInteger",
           "printedName": "SignedInteger",
-          "usr": "s:SZ"
+          "usr": "s:SZ",
+          "mangledName": "$sSZ"
         },
         {
           "kind": "Conformance",
           "name": "_ExpressibleByBuiltinIntegerLiteral",
           "printedName": "_ExpressibleByBuiltinIntegerLiteral",
-          "usr": "s:s35_ExpressibleByBuiltinIntegerLiteralP"
+          "usr": "s:s35_ExpressibleByBuiltinIntegerLiteralP",
+          "mangledName": "$ss35_ExpressibleByBuiltinIntegerLiteralP"
         },
         {
           "kind": "Conformance",
@@ -1610,19 +1716,22 @@
               ]
             }
           ],
-          "usr": "s:Sz"
+          "usr": "s:Sz",
+          "mangledName": "$sSz"
         },
         {
           "kind": "Conformance",
           "name": "LosslessStringConvertible",
           "printedName": "LosslessStringConvertible",
-          "usr": "s:s25LosslessStringConvertibleP"
+          "usr": "s:s25LosslessStringConvertibleP",
+          "mangledName": "$ss25LosslessStringConvertibleP"
         },
         {
           "kind": "Conformance",
           "name": "SignedNumeric",
           "printedName": "SignedNumeric",
-          "usr": "s:s13SignedNumericP"
+          "usr": "s:s13SignedNumericP",
+          "mangledName": "$ss13SignedNumericP"
         },
         {
           "kind": "Conformance",
@@ -1643,13 +1752,15 @@
               ]
             }
           ],
-          "usr": "s:Sj"
+          "usr": "s:Sj",
+          "mangledName": "$sSj"
         },
         {
           "kind": "Conformance",
           "name": "CustomStringConvertible",
           "printedName": "CustomStringConvertible",
-          "usr": "s:s23CustomStringConvertibleP"
+          "usr": "s:s23CustomStringConvertibleP",
+          "mangledName": "$ss23CustomStringConvertibleP"
         },
         {
           "kind": "Conformance",
@@ -1670,13 +1781,15 @@
               ]
             }
           ],
-          "usr": "s:Sx"
+          "usr": "s:Sx",
+          "mangledName": "$sSx"
         },
         {
           "kind": "Conformance",
           "name": "AdditiveArithmetic",
           "printedName": "AdditiveArithmetic",
-          "usr": "s:s18AdditiveArithmeticP"
+          "usr": "s:s18AdditiveArithmeticP",
+          "mangledName": "$ss18AdditiveArithmeticP"
         },
         {
           "kind": "Conformance",
@@ -1697,79 +1810,92 @@
               ]
             }
           ],
-          "usr": "s:s27ExpressibleByIntegerLiteralP"
+          "usr": "s:s27ExpressibleByIntegerLiteralP",
+          "mangledName": "$ss27ExpressibleByIntegerLiteralP"
         },
         {
           "kind": "Conformance",
           "name": "Comparable",
           "printedName": "Comparable",
-          "usr": "s:SL"
+          "usr": "s:SL",
+          "mangledName": "$sSL"
         },
         {
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         },
         {
           "kind": "Conformance",
           "name": "Encodable",
           "printedName": "Encodable",
-          "usr": "s:SE"
+          "usr": "s:SE",
+          "mangledName": "$sSE"
         },
         {
           "kind": "Conformance",
           "name": "Decodable",
           "printedName": "Decodable",
-          "usr": "s:Se"
+          "usr": "s:Se",
+          "mangledName": "$sSe"
         },
         {
           "kind": "Conformance",
           "name": "CustomReflectable",
           "printedName": "CustomReflectable",
-          "usr": "s:s17CustomReflectableP"
+          "usr": "s:s17CustomReflectableP",
+          "mangledName": "$ss17CustomReflectableP"
         },
         {
           "kind": "Conformance",
           "name": "_CustomPlaygroundQuickLookable",
           "printedName": "_CustomPlaygroundQuickLookable",
-          "usr": "s:s30_CustomPlaygroundQuickLookableP"
+          "usr": "s:s30_CustomPlaygroundQuickLookableP",
+          "mangledName": "$ss30_CustomPlaygroundQuickLookableP"
         },
         {
           "kind": "Conformance",
           "name": "MirrorPath",
           "printedName": "MirrorPath",
-          "usr": "s:s10MirrorPathP"
+          "usr": "s:s10MirrorPathP",
+          "mangledName": "$ss10MirrorPathP"
         },
         {
           "kind": "Conformance",
           "name": "CVarArg",
           "printedName": "CVarArg",
-          "usr": "s:s7CVarArgP"
+          "usr": "s:s7CVarArgP",
+          "mangledName": "$ss7CVarArgP"
         },
         {
           "kind": "Conformance",
           "name": "Hashable",
           "printedName": "Hashable",
-          "usr": "s:SH"
+          "usr": "s:SH",
+          "mangledName": "$sSH"
         },
         {
           "kind": "Conformance",
           "name": "Equatable",
           "printedName": "Equatable",
-          "usr": "s:SQ"
+          "usr": "s:SQ",
+          "mangledName": "$sSQ"
         },
         {
           "kind": "Conformance",
           "name": "_HasCustomAnyHashableRepresentation",
           "printedName": "_HasCustomAnyHashableRepresentation",
-          "usr": "s:s35_HasCustomAnyHashableRepresentationP"
+          "usr": "s:s35_HasCustomAnyHashableRepresentationP",
+          "mangledName": "$ss35_HasCustomAnyHashableRepresentationP"
         },
         {
           "kind": "Conformance",
           "name": "Sendable",
           "printedName": "Sendable",
-          "usr": "s:s8SendableP"
+          "usr": "s:s8SendableP",
+          "mangledName": "$ss8SendableP"
         },
         {
           "kind": "Conformance",
@@ -1868,7 +1994,8 @@
               ]
             }
           ],
-          "usr": "s:s10SIMDScalarP"
+          "usr": "s:s10SIMDScalarP",
+          "mangledName": "$ss10SIMDScalarP"
         }
       ]
     }
diff --git a/test/api-digester/Outputs/cake.json b/test/api-digester/Outputs/cake.json
index e7b79d34b5f72..786f5f6e5ac7f 100644
--- a/test/api-digester/Outputs/cake.json
+++ b/test/api-digester/Outputs/cake.json
@@ -58,6 +58,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2P1PAAE1poiyAaB_pAaB_p_AaB_ptFZ",
+          "mangledName": "$s4cake2P1PAAE1poiyAaB_pAaB_p_AaB_ptFZ",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.P1>",
           "static": true,
@@ -66,6 +67,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake2P1P",
+      "mangledName": "$s4cake2P1P",
       "moduleName": "cake"
     },
     {
@@ -74,6 +76,7 @@
       "printedName": "P2",
       "declKind": "Protocol",
       "usr": "s:4cake2P2P",
+      "mangledName": "$s4cake2P2P",
       "moduleName": "cake"
     },
     {
@@ -82,6 +85,7 @@
       "printedName": "P3",
       "declKind": "Protocol",
       "usr": "s:4cake2P3P",
+      "mangledName": "$s4cake2P3P",
       "moduleName": "cake",
       "genericSig": "<Self : cake.P1, Self : cake.P2>",
       "conformances": [
@@ -89,13 +93,15 @@
           "kind": "Conformance",
           "name": "P2",
           "printedName": "P2",
-          "usr": "s:4cake2P2P"
+          "usr": "s:4cake2P2P",
+          "mangledName": "$s4cake2P2P"
         },
         {
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         }
       ]
     },
@@ -117,6 +123,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2S1V4foo1yyFZ",
+          "mangledName": "$s4cake2S1V4foo1yyFZ",
           "moduleName": "cake",
           "static": true,
           "funcSelfKind": "NonMutating"
@@ -134,6 +141,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2S1V4foo2yyF",
+          "mangledName": "$s4cake2S1V4foo2yyF",
           "moduleName": "cake",
           "funcSelfKind": "Mutating"
         },
@@ -157,12 +165,14 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2S1V4foo6yyF",
+          "mangledName": "$s4cake2S1V4foo6yyF",
           "moduleName": "cake",
           "funcSelfKind": "NonMutating"
         }
       ],
       "declKind": "Struct",
       "usr": "s:4cake2S1V",
+      "mangledName": "$s4cake2S1V",
       "moduleName": "cake",
       "declAttributes": [
         "Frozen"
@@ -172,19 +182,22 @@
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         },
         {
           "kind": "Conformance",
           "name": "Sendable",
           "printedName": "Sendable",
-          "usr": "s:s8SendableP"
+          "usr": "s:s8SendableP",
+          "mangledName": "$ss8SendableP"
         },
         {
           "kind": "Conformance",
           "name": "P2",
           "printedName": "P2",
-          "usr": "s:4cake2P2P"
+          "usr": "s:4cake2P2P",
+          "mangledName": "$s4cake2P2P"
         }
       ]
     },
@@ -206,6 +219,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2C0CA2A2S1VRszAERs_AERs0_rlE17conditionalFooExtyyF",
+          "mangledName": "$s4cake2C0CA2A2S1VRszAERs_AERs0_rlE17conditionalFooExtyyF",
           "moduleName": "cake",
           "genericSig": "<T1, T2, T3 where T1 == cake.S1, T2 == cake.S1, T3 == cake.S1>",
           "funcSelfKind": "NonMutating"
@@ -223,6 +237,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2C0C19unconditionalFooExtyyF",
+          "mangledName": "$s4cake2C0C19unconditionalFooExtyyF",
           "moduleName": "cake",
           "genericSig": "<T1, T2, T3>",
           "funcSelfKind": "NonMutating"
@@ -230,6 +245,7 @@
       ],
       "declKind": "Class",
       "usr": "s:4cake2C0C",
+      "mangledName": "$s4cake2C0C",
       "moduleName": "cake",
       "genericSig": "<T1, T2, T3>",
       "hasMissingDesignatedInitializers": true
@@ -268,6 +284,7 @@
       ],
       "declKind": "TypeAlias",
       "usr": "s:4cake7C0Aliasa",
+      "mangledName": "$s4cake7C0Aliasa",
       "moduleName": "cake"
     },
     {
@@ -288,6 +305,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake2C1C4foo1yyFZ",
+          "mangledName": "$s4cake2C1C4foo1yyFZ",
           "moduleName": "cake",
           "static": true,
           "isOpen": true,
@@ -306,6 +324,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake2C1C3InsACSgvp",
+          "mangledName": "$s4cake2C1C3InsACSgvp",
           "moduleName": "cake",
           "declAttributes": [
             "HasInitialValue",
@@ -337,6 +356,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C3InsACSgvg",
+              "mangledName": "$s4cake2C1C3InsACSgvg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -371,6 +391,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C3InsACSgvs",
+              "mangledName": "$s4cake2C1C3InsACSgvs",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -393,6 +414,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake2C1C4Ins2ACvp",
+          "mangledName": "$s4cake2C1C4Ins2ACvp",
           "moduleName": "cake",
           "declAttributes": [
             "HasInitialValue",
@@ -416,6 +438,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C4Ins2ACvg",
+              "mangledName": "$s4cake2C1C4Ins2ACvg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -442,6 +465,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake2C1C4Ins2ACvs",
+              "mangledName": "$s4cake2C1C4Ins2ACvs",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -454,6 +478,7 @@
       ],
       "declKind": "Class",
       "usr": "s:4cake2C1C",
+      "mangledName": "$s4cake2C1C",
       "moduleName": "cake",
       "superclassUsr": "s:4cake2C0C",
       "hasMissingDesignatedInitializers": true,
@@ -488,6 +513,7 @@
       ],
       "declKind": "Func",
       "usr": "s:4cake4foo1_1bySi_AA2S1VtF",
+      "mangledName": "$s4cake4foo1_1bySi_AA2S1VtF",
       "moduleName": "cake",
       "funcSelfKind": "NonMutating"
     },
@@ -517,6 +543,7 @@
       ],
       "declKind": "Func",
       "usr": "s:4cake4foo2_1bySi_AA2S1VtF",
+      "mangledName": "$s4cake4foo2_1bySi_AA2S1VtF",
       "moduleName": "cake",
       "funcSelfKind": "NonMutating"
     },
@@ -566,6 +593,7 @@
           ],
           "declKind": "EnumElement",
           "usr": "s:4cake6NumberO3oneyA2CmF",
+          "mangledName": "$s4cake6NumberO3oneyA2CmF",
           "moduleName": "cake"
         },
         {
@@ -596,6 +624,7 @@
           ],
           "declKind": "Constructor",
           "usr": "s:4cake6NumberO8rawValueACSgSi_tcfc",
+          "mangledName": "$s4cake6NumberO8rawValueACSgSi_tcfc",
           "moduleName": "cake",
           "implicit": true,
           "declAttributes": [
@@ -617,6 +646,7 @@
           ],
           "declKind": "TypeAlias",
           "usr": "s:4cake6NumberO8RawValuea",
+          "mangledName": "$s4cake6NumberO8RawValuea",
           "moduleName": "cake",
           "implicit": true
         },
@@ -634,6 +664,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake6NumberO8rawValueSivp",
+          "mangledName": "$s4cake6NumberO8rawValueSivp",
           "moduleName": "cake",
           "implicit": true,
           "accessors": [
@@ -651,6 +682,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake6NumberO8rawValueSivg",
+              "mangledName": "$s4cake6NumberO8rawValueSivg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -663,6 +695,7 @@
       ],
       "declKind": "Enum",
       "usr": "s:4cake6NumberO",
+      "mangledName": "$s4cake6NumberO",
       "moduleName": "cake",
       "enumRawTypeName": "Int",
       "isEnumExhaustive": true,
@@ -671,13 +704,15 @@
           "kind": "Conformance",
           "name": "Equatable",
           "printedName": "Equatable",
-          "usr": "s:SQ"
+          "usr": "s:SQ",
+          "mangledName": "$sSQ"
         },
         {
           "kind": "Conformance",
           "name": "Hashable",
           "printedName": "Hashable",
-          "usr": "s:SH"
+          "usr": "s:SH",
+          "mangledName": "$sSH"
         },
         {
           "kind": "Conformance",
@@ -698,7 +733,8 @@
               ]
             }
           ],
-          "usr": "s:SY"
+          "usr": "s:SY",
+          "mangledName": "$sSY"
         }
       ]
     },
@@ -735,6 +771,7 @@
       ],
       "declKind": "Func",
       "usr": "s:4cake4foo3yySDySiSSGF",
+      "mangledName": "$s4cake4foo3yySDySiSSGF",
       "moduleName": "cake",
       "funcSelfKind": "NonMutating"
     },
@@ -757,6 +794,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake17fixedLayoutStructV1aSivp",
+          "mangledName": "$s4cake17fixedLayoutStructV1aSivp",
           "moduleName": "cake",
           "declAttributes": [
             "HasInitialValue",
@@ -778,6 +816,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake17fixedLayoutStructV1aSivg",
+              "mangledName": "$s4cake17fixedLayoutStructV1aSivg",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -804,6 +843,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake17fixedLayoutStructV1aSivs",
+              "mangledName": "$s4cake17fixedLayoutStructV1aSivs",
               "moduleName": "cake",
               "implicit": true,
               "declAttributes": [
@@ -816,6 +856,7 @@
       ],
       "declKind": "Struct",
       "usr": "s:4cake17fixedLayoutStructV",
+      "mangledName": "$s4cake17fixedLayoutStructV",
       "moduleName": "cake",
       "declAttributes": [
         "Frozen"
@@ -825,7 +866,8 @@
           "kind": "Conformance",
           "name": "Sendable",
           "printedName": "Sendable",
-          "usr": "s:s8SendableP"
+          "usr": "s:s8SendableP",
+          "mangledName": "$ss8SendableP"
         }
       ]
     },
@@ -840,6 +882,7 @@
           "printedName": "A",
           "declKind": "AssociatedType",
           "usr": "s:4cake21ProWithAssociatedTypeP1AQa",
+          "mangledName": "$s4cake21ProWithAssociatedTypeP1AQa",
           "moduleName": "cake",
           "protocolReq": true
         },
@@ -857,6 +900,7 @@
           ],
           "declKind": "AssociatedType",
           "usr": "s:4cake21ProWithAssociatedTypeP1BQa",
+          "mangledName": "$s4cake21ProWithAssociatedTypeP1BQa",
           "moduleName": "cake",
           "protocolReq": true
         },
@@ -873,6 +917,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake21ProWithAssociatedTypePAAE10NonReqFuncyyF",
+          "mangledName": "$s4cake21ProWithAssociatedTypePAAE10NonReqFuncyyF",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.ProWithAssociatedType>",
           "funcSelfKind": "NonMutating"
@@ -891,6 +936,7 @@
           ],
           "declKind": "Var",
           "usr": "s:4cake21ProWithAssociatedTypePAAE9NonReqVarSivp",
+          "mangledName": "$s4cake21ProWithAssociatedTypePAAE9NonReqVarSivp",
           "moduleName": "cake",
           "accessors": [
             {
@@ -907,6 +953,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake21ProWithAssociatedTypePAAE9NonReqVarSivg",
+              "mangledName": "$s4cake21ProWithAssociatedTypePAAE9NonReqVarSivg",
               "moduleName": "cake",
               "genericSig": "<Self where Self : cake.ProWithAssociatedType>",
               "accessorKind": "get"
@@ -927,12 +974,14 @@
           ],
           "declKind": "TypeAlias",
           "usr": "s:4cake21ProWithAssociatedTypePAAE11NonReqAliasa",
+          "mangledName": "$s4cake21ProWithAssociatedTypePAAE11NonReqAliasa",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.ProWithAssociatedType>"
         }
       ],
       "declKind": "Protocol",
       "usr": "s:4cake21ProWithAssociatedTypeP",
+      "mangledName": "$s4cake21ProWithAssociatedTypeP",
       "moduleName": "cake"
     },
     {
@@ -960,6 +1009,7 @@
           ],
           "declKind": "Subscript",
           "usr": "s:4cake13SubsContainerP6getterS2i_tcip",
+          "mangledName": "$s4cake13SubsContainerP6getterS2i_tcip",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.SubsContainer>",
           "protocolReq": true,
@@ -984,6 +1034,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake13SubsContainerP6getterS2i_tcig",
+              "mangledName": "$s4cake13SubsContainerP6getterS2i_tcig",
               "moduleName": "cake",
               "genericSig": "<Self where Self : cake.SubsContainer>",
               "protocolReq": true,
@@ -1012,6 +1063,7 @@
           ],
           "declKind": "Subscript",
           "usr": "s:4cake13SubsContainerP6setterS2i_tcip",
+          "mangledName": "$s4cake13SubsContainerP6setterS2i_tcip",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.SubsContainer>",
           "protocolReq": true,
@@ -1036,6 +1088,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake13SubsContainerP6setterS2i_tcig",
+              "mangledName": "$s4cake13SubsContainerP6setterS2i_tcig",
               "moduleName": "cake",
               "genericSig": "<Self where Self : cake.SubsContainer>",
               "protocolReq": true,
@@ -1067,6 +1120,7 @@
               ],
               "declKind": "Accessor",
               "usr": "s:4cake13SubsContainerP6setterS2i_tcis",
+              "mangledName": "$s4cake13SubsContainerP6setterS2i_tcis",
               "moduleName": "cake",
               "genericSig": "<Self where Self : cake.SubsContainer>",
               "protocolReq": true,
@@ -1078,6 +1132,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake13SubsContainerP",
+      "mangledName": "$s4cake13SubsContainerP",
       "moduleName": "cake"
     },
     {
@@ -1091,6 +1146,7 @@
           "printedName": "T",
           "declKind": "AssociatedType",
           "usr": "s:4cake6PSuperP1TQa",
+          "mangledName": "$s4cake6PSuperP1TQa",
           "moduleName": "cake",
           "protocolReq": true
         },
@@ -1107,6 +1163,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake6PSuperP3fooyyF",
+          "mangledName": "$s4cake6PSuperP3fooyyF",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.PSuper>",
           "protocolReq": true,
@@ -1126,6 +1183,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake6PSuperPAAE9futureFooyyF",
+          "mangledName": "$s4cake6PSuperPAAE9futureFooyyF",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.PSuper>",
           "funcSelfKind": "NonMutating"
@@ -1133,6 +1191,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake6PSuperP",
+      "mangledName": "$s4cake6PSuperP",
       "moduleName": "cake"
     },
     {
@@ -1146,6 +1205,7 @@
           "printedName": "T",
           "declKind": "AssociatedType",
           "usr": "s:4cake4PSubP1TQa",
+          "mangledName": "$s4cake4PSubP1TQa",
           "moduleName": "cake",
           "protocolReq": true,
           "overriding": true
@@ -1163,6 +1223,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake4PSubP3fooyyF",
+          "mangledName": "$s4cake4PSubP3fooyyF",
           "moduleName": "cake",
           "genericSig": "<Self where Self : cake.PSub>",
           "protocolReq": true,
@@ -1175,6 +1236,7 @@
       ],
       "declKind": "Protocol",
       "usr": "s:4cake4PSubP",
+      "mangledName": "$s4cake4PSubP",
       "moduleName": "cake",
       "genericSig": "<Self : cake.PSuper>",
       "conformances": [
@@ -1182,7 +1244,8 @@
           "kind": "Conformance",
           "name": "PSuper",
           "printedName": "PSuper",
-          "usr": "s:4cake6PSuperP"
+          "usr": "s:4cake6PSuperP",
+          "mangledName": "$s4cake6PSuperP"
         }
       ]
     },
@@ -1200,6 +1263,7 @@
       ],
       "declKind": "Var",
       "usr": "s:4cake9GlobalVarSivp",
+      "mangledName": "$s4cake9GlobalVarSivp",
       "moduleName": "cake",
       "declAttributes": [
         "HasInitialValue",
@@ -1236,6 +1300,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake15FutureContainerC9futureFooyyF",
+          "mangledName": "$s4cake15FutureContainerC9futureFooyyF",
           "moduleName": "cake",
           "intro_Macosx": "10.15",
           "intro_iOS": "13",
@@ -1262,6 +1327,7 @@
           ],
           "declKind": "Func",
           "usr": "s:4cake15FutureContainerC12NotfutureFooyyF",
+          "mangledName": "$s4cake15FutureContainerC12NotfutureFooyyF",
           "moduleName": "cake",
           "intro_Macosx": "10.15",
           "declAttributes": [
@@ -1272,6 +1338,7 @@
       ],
       "declKind": "Class",
       "usr": "s:4cake15FutureContainerC",
+      "mangledName": "$s4cake15FutureContainerC",
       "moduleName": "cake",
       "hasMissingDesignatedInitializers": true,
       "conformances": [
@@ -1279,13 +1346,15 @@
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         },
         {
           "kind": "Conformance",
           "name": "P2",
           "printedName": "P2",
-          "usr": "s:4cake2P2P"
+          "usr": "s:4cake2P2P",
+          "mangledName": "$s4cake2P2P"
         }
       ]
     },
@@ -1295,6 +1364,7 @@
       "printedName": "PlatformIntroClass",
       "declKind": "Class",
       "usr": "s:4cake18PlatformIntroClassC",
+      "mangledName": "$s4cake18PlatformIntroClassC",
       "moduleName": "cake",
       "intro_Macosx": "10.1",
       "intro_iOS": "10.2",
@@ -1314,6 +1384,7 @@
       "printedName": "SwiftIntroClass",
       "declKind": "Class",
       "usr": "s:4cake15SwiftIntroClassC",
+      "mangledName": "$s4cake15SwiftIntroClassC",
       "moduleName": "cake",
       "intro_swift": "5",
       "declAttributes": [
@@ -1357,6 +1428,7 @@
           ],
           "declKind": "Func",
           "usr": "c:@M@cake@objc(cs)NewObjCClass(im)ObjCFool:ObjCA:ObjCB:",
+          "mangledName": "$s4cake14SwiftObjcClassC3foo1a1b1cySi_S2itF",
           "moduleName": "cake",
           "objc_name": "ObjCFool:ObjCA:ObjCB:",
           "declAttributes": [
@@ -1367,6 +1439,7 @@
       ],
       "declKind": "Class",
       "usr": "c:@M@cake@objc(cs)NewObjCClass",
+      "mangledName": "$s4cake14SwiftObjcClassC",
       "moduleName": "cake",
       "objc_name": "NewObjCClass",
       "declAttributes": [
@@ -1387,12 +1460,33 @@
       ],
       "declKind": "Func",
       "usr": "s:4cake18emitIntoClientFuncyyF",
+      "mangledName": "$s4cake18emitIntoClientFuncyyF",
       "moduleName": "cake",
       "declAttributes": [
         "AlwaysEmitIntoClient"
       ],
       "funcSelfKind": "NonMutating"
     },
+    {
+      "kind": "Function",
+      "name": "silgenNamedFunc",
+      "printedName": "silgenNamedFunc()",
+      "children": [
+        {
+          "kind": "TypeNominal",
+          "name": "Void",
+          "printedName": "()"
+        }
+      ],
+      "declKind": "Func",
+      "usr": "s:4cake15silgenNamedFuncyyF",
+      "mangledName": "silgenName",
+      "moduleName": "cake",
+      "declAttributes": [
+        "SILGenName"
+      ],
+      "funcSelfKind": "NonMutating"
+    },
     {
       "kind": "TypeDecl",
       "name": "Int",
@@ -1411,6 +1505,7 @@
           ],
           "declKind": "Func",
           "usr": "s:Si4cakeE3fooyyF",
+          "mangledName": "$sSi4cakeE3fooyyF",
           "moduleName": "cake",
           "funcSelfKind": "NonMutating"
         },
@@ -1427,12 +1522,14 @@
           ],
           "declKind": "Func",
           "usr": "s:Si4cakeE3baryyF",
+          "mangledName": "$sSi4cakeE3baryyF",
           "moduleName": "cake",
           "funcSelfKind": "NonMutating"
         }
       ],
       "declKind": "Struct",
       "usr": "s:Si",
+      "mangledName": "$sSi",
       "moduleName": "Swift",
       "declAttributes": [
         "Frozen"
@@ -1443,13 +1540,15 @@
           "kind": "Conformance",
           "name": "FixedWidthInteger",
           "printedName": "FixedWidthInteger",
-          "usr": "s:s17FixedWidthIntegerP"
+          "usr": "s:s17FixedWidthIntegerP",
+          "mangledName": "$ss17FixedWidthIntegerP"
         },
         {
           "kind": "Conformance",
           "name": "SignedInteger",
           "printedName": "SignedInteger",
-          "usr": "s:SZ"
+          "usr": "s:SZ",
+          "mangledName": "$sSZ"
         },
         {
           "kind": "Conformance",
@@ -1470,19 +1569,22 @@
               ]
             }
           ],
-          "usr": "s:Sz"
+          "usr": "s:Sz",
+          "mangledName": "$sSz"
         },
         {
           "kind": "Conformance",
           "name": "LosslessStringConvertible",
           "printedName": "LosslessStringConvertible",
-          "usr": "s:s25LosslessStringConvertibleP"
+          "usr": "s:s25LosslessStringConvertibleP",
+          "mangledName": "$ss25LosslessStringConvertibleP"
         },
         {
           "kind": "Conformance",
           "name": "SignedNumeric",
           "printedName": "SignedNumeric",
-          "usr": "s:s13SignedNumericP"
+          "usr": "s:s13SignedNumericP",
+          "mangledName": "$ss13SignedNumericP"
         },
         {
           "kind": "Conformance",
@@ -1510,13 +1612,15 @@
               ]
             }
           ],
-          "usr": "s:Sj"
+          "usr": "s:Sj",
+          "mangledName": "$sSj"
         },
         {
           "kind": "Conformance",
           "name": "CustomStringConvertible",
           "printedName": "CustomStringConvertible",
-          "usr": "s:s23CustomStringConvertibleP"
+          "usr": "s:s23CustomStringConvertibleP",
+          "mangledName": "$ss23CustomStringConvertibleP"
         },
         {
           "kind": "Conformance",
@@ -1537,13 +1641,15 @@
               ]
             }
           ],
-          "usr": "s:Sx"
+          "usr": "s:Sx",
+          "mangledName": "$sSx"
         },
         {
           "kind": "Conformance",
           "name": "AdditiveArithmetic",
           "printedName": "AdditiveArithmetic",
-          "usr": "s:s18AdditiveArithmeticP"
+          "usr": "s:s18AdditiveArithmeticP",
+          "mangledName": "$ss18AdditiveArithmeticP"
         },
         {
           "kind": "Conformance",
@@ -1571,67 +1677,78 @@
               ]
             }
           ],
-          "usr": "s:s27ExpressibleByIntegerLiteralP"
+          "usr": "s:s27ExpressibleByIntegerLiteralP",
+          "mangledName": "$ss27ExpressibleByIntegerLiteralP"
         },
         {
           "kind": "Conformance",
           "name": "Comparable",
           "printedName": "Comparable",
-          "usr": "s:SL"
+          "usr": "s:SL",
+          "mangledName": "$sSL"
         },
         {
           "kind": "Conformance",
           "name": "P1",
           "printedName": "P1",
-          "usr": "s:4cake2P1P"
+          "usr": "s:4cake2P1P",
+          "mangledName": "$s4cake2P1P"
         },
         {
           "kind": "Conformance",
           "name": "Encodable",
           "printedName": "Encodable",
-          "usr": "s:SE"
+          "usr": "s:SE",
+          "mangledName": "$sSE"
         },
         {
           "kind": "Conformance",
           "name": "Decodable",
           "printedName": "Decodable",
-          "usr": "s:Se"
+          "usr": "s:Se",
+          "mangledName": "$sSe"
         },
         {
           "kind": "Conformance",
           "name": "CustomReflectable",
           "printedName": "CustomReflectable",
-          "usr": "s:s17CustomReflectableP"
+          "usr": "s:s17CustomReflectableP",
+          "mangledName": "$ss17CustomReflectableP"
         },
         {
           "kind": "Conformance",
           "name": "MirrorPath",
           "printedName": "MirrorPath",
-          "usr": "s:s10MirrorPathP"
+          "usr": "s:s10MirrorPathP",
+          "mangledName": "$ss10MirrorPathP"
         },
         {
           "kind": "Conformance",
           "name": "CVarArg",
           "printedName": "CVarArg",
-          "usr": "s:s7CVarArgP"
+          "usr": "s:s7CVarArgP",
+          "mangledName": "$ss7CVarArgP"
         },
         {
           "kind": "Conformance",
           "name": "Hashable",
           "printedName": "Hashable",
-          "usr": "s:SH"
+          "usr": "s:SH",
+          "mangledName": "$sSH"
         },
         {
           "kind": "Conformance",
           "name": "Equatable",
           "printedName": "Equatable",
-          "usr": "s:SQ"
+          "usr": "s:SQ",
+          "mangledName": "$sSQ"
         },
         {
           "kind": "Conformance",
           "name": "Sendable",
           "printedName": "Sendable",
-          "usr": "s:s8SendableP"
+          "usr": "s:s8SendableP",
+          "mangledName": "$ss8SendableP"
         },
         {
           "kind": "Conformance",
@@ -1737,7 +1854,8 @@
               ]
             }
           ],
-          "usr": "s:s10SIMDScalarP"
+          "usr": "s:s10SIMDScalarP",
+          "mangledName": "$ss10SIMDScalarP"
         }
       ]
     }
diff --git a/test/api-digester/internal-extension.swift b/test/api-digester/internal-extension.swift
index 76c9ebb385d85..4d49473acb353 100644
--- a/test/api-digester/internal-extension.swift
+++ b/test/api-digester/internal-extension.swift
@@ -31,7 +31,8 @@ internal extension S1 {
 // CHECK-NEXT:     "kind": "Conformance",
 // CHECK-NEXT:     "name": "PublicProto",
 // CHECK-NEXT:     "printedName": "PublicProto",
-// CHECK-NEXT:     "usr": "s:4main11PublicProtoP"
+// CHECK-NEXT:     "usr": "s:4main11PublicProtoP",
+// CHECK-NEXT:     "mangledName": "$s4main11PublicProtoP"
 // CHECK-NEXT:   }
 // CHECK-NEXT: ]
 extension C0: InternalProto {