From f7150be6745905b83f88c5397b15233f38d2a8be Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Wed, 14 Oct 2020 08:35:32 +0900
Subject: Suggest minimal subset features in `incomplete_features` lint

---
 compiler/rustc_lint/src/builtin.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'compiler/rustc_lint/src')

diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index abd899e8db4..a7db9199665 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -2288,12 +2288,20 @@ impl EarlyLintPass for IncompleteFeatures {
                             n, n,
                         ));
                     }
+                    if HAS_MIN_FEATURES.contains(&name) {
+                        builder.help(&format!(
+                            "consider using `min_{}` instead, which is more stable and complete",
+                            name,
+                        ));
+                    }
                     builder.emit();
                 })
             });
     }
 }
 
+const HAS_MIN_FEATURES: &[Symbol] = &[sym::const_generics, sym::specialization];
+
 declare_lint! {
     /// The `invalid_value` lint detects creating a value that is not valid,
     /// such as a NULL reference.
-- 
cgit 1.4.1-3-g733a5