internal/core/export: fix bytes printing bug

Change-Id: If8c7e78805c5f21b188cf28bc4c58d12b67842c0
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/7847
Reviewed-by: CUE cueckoo <[email protected]>
Reviewed-by: Marcel van Lohuizen <[email protected]>

Author: mpvl

internal/core/export/testdata/adt.txtar

@@ -12,6 +12,8 @@ d2: C="foo\(bar)": {
     foo: C.name
 }
 
+bytes: '\xeb \x1a\xf5\xaa\xf0\xd6\x06)'
+
 c1: mystrings.Contains("aa", "a")
 
 s1: """
@@ -95,8 +97,9 @@ d2: {
 		foo:  C.name
 	}
 }
-c1: mystrings.Contains("aa", "a")
-s1: """
+bytes: '\xeb \x1a\xf5\xaa\xf0\xd6\x06)'
+c1:    mystrings.Contains("aa", "a")
+s1:    """
 		multi
 		\(bar)
 		line
@@ -153,6 +156,7 @@ y1: {
 [d2 foobar]
 [d2 foobar name]
 [d2 foobar foo]
+[bytes]
 [c1]
 [s1]
 [l1]

internal/core/export/value.go

@@ -257,7 +257,7 @@ func (e *exporter) bytes(n *adt.Bytes, orig []adt.Conjunct) *ast.BasicLit {
 	if b := extractBasic(orig); b != nil {
 		return b
 	}
-	s := literal.String.WithOptionalTabIndent(len(e.stack)).Quote(string(n.B))
+	s := literal.Bytes.WithOptionalTabIndent(len(e.stack)).Quote(string(n.B))
 	return &ast.BasicLit{
 		Kind:  token.STRING,
 		Value: s,