fix: do not add commas after ';' in macro args (#6629)

Author: giammirove

src/lists.rs

@@ -288,10 +288,12 @@ where
         let inner_item = item.item.as_ref().or_else(|err| Err(err.clone()))?;
         let first = i == 0;
         let last = iter.peek().is_none();
-        let mut separate = match sep_place {
-            SeparatorPlace::Front => !first,
-            SeparatorPlace::Back => !last || trailing_separator,
-        };
+        let ends_with_semi = inner_item.ends_with(";");
+        let mut separate = !ends_with_semi
+            && match sep_place {
+                SeparatorPlace::Front => !first,
+                SeparatorPlace::Back => !last || trailing_separator,
+            };
         let item_sep_len = if separate { sep_len } else { 0 };
 
         // Item string may be multi-line. Its length (used for block comment alignment)

tests/source/issue-6629.rs

@@ -0,0 +1,9 @@
+macro_rules! reproduce {
+    (type Fail = $ty:ty; arr = $($arr:expr),*) => {
+        ( vec![$($arr),+] )
+    };
+}
+
+fn main() {
+    reproduce!(type Fail = char; arr = 1);
+}

tests/target/issue-6629.rs

@@ -0,0 +1,9 @@
+macro_rules! reproduce {
+    (type Fail = $ty:ty; arr = $($arr:expr),*) => {
+        ( vec![$($arr),+] )
+    };
+}
+
+fn main() {
+    reproduce!(type Fail = char; arr = 1);
+}