Suppress suggestions in derive macro

Author: long-long-float

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -2839,13 +2839,22 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     let msg =
                         format!("{} and panic if the converted value doesn't fit", msg.clone());
                     let mut suggestion = sugg.clone();
-                    suggestion.push((
-                        expr.span.shrink_to_hi(),
-                        format!("{close_paren}.try_into().unwrap()"),
-                    ));
+                    if !expr.span.in_derive_expansion() {
+                        suggestion.push((
+                            expr.span.shrink_to_hi(),
+                            format!("{close_paren}.try_into().unwrap()"),
+                        ));
+                    }
                     (msg, suggestion)
                 };
-                err.multipart_suggestion_verbose(msg, suggestion, Applicability::MachineApplicable);
+
+                if !suggestion.is_empty() {
+                    err.multipart_suggestion_verbose(
+                        msg,
+                        suggestion,
+                        Applicability::MachineApplicable,
+                    );
+                }
             };
 
         let suggest_to_change_suffix_or_into =