Comments around trait bounds

src/items.rs

@@ -937,11 +937,20 @@ pub fn format_trait(context: &RewriteContext, item: &ast::Item, offset: Indent)
 
         let body_lo = context.codemap.span_after(item.span, "{");
 
-        let shape = Shape::indented(offset + last_line_width(&result), context.config);
+        let shape = Shape::indented(offset, context.config);
         let generics_str =
             rewrite_generics(context, generics, shape, mk_sp(item.span.lo(), body_lo))?;
         result.push_str(&generics_str);
 
+        // FIXME(#2055): rustfmt fails to format when there are comments between trait bounds.
+        if !type_param_bounds.is_empty() {
+            let ident_hi = context.codemap.span_after(item.span, &format!("{}", item.ident));
+            let bound_hi = type_param_bounds.last().unwrap().span().hi();
+            let snippet = context.snippet(mk_sp(ident_hi, bound_hi));
+            if contains_comment(&snippet) {
+                return None;
+            }
+        }
         let trait_bound_str = rewrite_trait_bounds(
             context,
             type_param_bounds,

tests/source/trait.rs

@@ -57,3 +57,11 @@ trait X /* comment */ {}
 trait Y // comment
 {
 }
+
+// #2055
+pub trait Foo:
+// A and C
+A + C
+// and B
+    + B
+{}

tests/target/trait.rs

@@ -84,3 +84,11 @@ trait X /* comment */ {}
 trait Y // comment
 {
 }
+
+// #2055
+pub trait Foo:
+// A and C
+A + C
+// and B
+    + B
+{}