gate the change on style edition 2024

Author: RalfJung

src/visitor.rs

@@ -224,7 +224,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
         self.trim_spaces_after_opening_brace(b, inner_attrs);
 
         // Try to detect comments that refer to the block, not the first statement in the block.
-        if has_braces {
+        if has_braces && self.config.style_edition() >= StyleEdition::Edition2024 {
             let block_line_range = self.psess.lookup_line_range(b.span);
             if block_line_range.lo != block_line_range.hi {
                 // Skipping if a single line block

tests/source/issue-3255.rs

@@ -1,3 +1,5 @@
+// rustfmt-style_edition: 2024
+
 fn foo(){  
     if true {      // Sample comment
                    // second-line comment

tests/target/async_fn.rs

@@ -13,7 +13,8 @@ async unsafe fn foo() {
 }
 
 async unsafe fn rust() {
-    async move { // comment
+    async move {
+        // comment
         Ok(())
     }
 }

tests/target/control-brace-style-always-next-line.rs

@@ -20,7 +20,8 @@ fn main() {
     }
 
     'while_label: while cond
-    { // while comment
+    {
+        // while comment
         ();
     }
 

tests/target/control-brace-style-always-same-line.rs

@@ -15,7 +15,8 @@ fn main() {
         ();
     }
 
-    'while_label: while cond { // while comment
+    'while_label: while cond {
+        // while comment
         ();
     }
 

tests/target/label_break.rs

@@ -19,7 +19,8 @@ fn main() {
             // comment
             break 'block 1;
         }
-        if bar() { /* comment */
+        if bar() {
+            /* comment */
             break 'block 2;
         }
         3

tests/target/match.rs

@@ -7,7 +7,8 @@ fn foo() {
         // Some comment.
         a => foo(),
         b if 0 < 42 => foo(),
-        c => { // Another comment.
+        c => {
+            // Another comment.
             // Comment.
             an_expression;
             foo()