correctly parse trailing commas in record

compiler/can/src/operator.rs

@@ -123,7 +123,16 @@ pub fn desugar_expr<'a>(arena: &'a Bump, loc_expr: &'a Located<Expr<'a>>) -> &'a
                 value,
             })
         }
-        Record { fields, update, trailing_comma } | Nested(Record { fields, update, trailing_comma }) => {
+        Record {
+            fields,
+            update,
+            final_comments,
+        }
+        | Nested(Record {
+            fields,
+            update,
+            final_comments,
+        }) => {
             let mut new_fields = Vec::with_capacity_in(fields.len(), arena);
 
             for field in fields.iter() {
@@ -142,7 +151,7 @@ pub fn desugar_expr<'a>(arena: &'a Bump, loc_expr: &'a Located<Expr<'a>>) -> &'a
                 value: Record {
                     update: *update,
                     fields: new_fields,
-                    trailing_comma: trailing_comma,
+                    final_comments,
                 },
             })
         }