From b71c8b64b5f1609ca68c4a84fb3b28cb17b6f25c Mon Sep 17 00:00:00 2001
From: csmoe <csmoe@msn.com>
Date: Thu, 27 Aug 2020 22:01:52 +0800
Subject: [PATCH] should not try to apply field accessing on enum

---
 src/librustc_typeck/check/expr.rs | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/librustc_typeck/check/expr.rs b/src/librustc_typeck/check/expr.rs
index 82ed8fda8b4..582357273d6 100644
--- a/src/librustc_typeck/check/expr.rs
+++ b/src/librustc_typeck/check/expr.rs
@@ -1545,13 +1545,17 @@ fn suggest_await_on_field_access(
                 normalized_ty.kind,
             );
             if let ty::Adt(def, _) = normalized_ty.kind {
-                if def.non_enum_variant().fields.iter().any(|field| field.ident == field_ident) {
-                    err.span_suggestion_verbose(
-                        base.span.shrink_to_hi(),
-                        "consider awaiting before field access",
-                        ".await".to_string(),
-                        Applicability::MaybeIncorrect,
-                    );
+                // no field access on enum type
+                if !def.is_enum() {
+                    if def.non_enum_variant().fields.iter().any(|field| field.ident == field_ident)
+                    {
+                        err.span_suggestion_verbose(
+                            base.span.shrink_to_hi(),
+                            "consider awaiting before field access",
+                            ".await".to_string(),
+                            Applicability::MaybeIncorrect,
+                        );
+                    }
                 }
             }
         }