implement is_accessible_span

compiler/rustc_errors/src/lib.rs

@@ -1558,7 +1558,7 @@ pub fn add_elided_lifetime_in_path_suggestion(
     insertion_span: Span,
 ) {
     diag.span_label(path_span, format!("expected lifetime parameter{}", pluralize!(n)));
-    if source_map.span_to_snippet(insertion_span).is_err() {
+    if !source_map.is_accessible_span(insertion_span) {
         // Do not try to suggest anything if generated by a proc-macro.
         return;
     }