X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_lint%2Fsrc%2Flints.rs;h=2e447b900e1174b79ed142bb3c1cbf0d664e34ba;hb=00efb0cb960e4b89a80cad7d44fa0eefd223f513;hp=0c1019545f382f8a5ce425a871a5aa1cc225f149;hpb=d94698cb378feb86e1309eb913bad603cf2089e8;p=rust.git

diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs
index 0c1019545f3..2e447b900e1 100644
--- a/compiler/rustc_lint/src/lints.rs
+++ b/compiler/rustc_lint/src/lints.rs
@@ -1402,6 +1402,21 @@ pub struct UnusedDef<'a, 'b> {
     pub cx: &'a LateContext<'b>,
     pub def_id: DefId,
     pub note: Option<Symbol>,
+    pub suggestion: Option<UnusedDefSuggestion>,
+}
+
+#[derive(Subdiagnostic)]
+pub enum UnusedDefSuggestion {
+    #[suggestion(
+        suggestion,
+        style = "verbose",
+        code = "let _ = ",
+        applicability = "machine-applicable"
+    )]
+    Default {
+        #[primary_span]
+        span: Span,
+    },
 }
 
 // Needed because of def_path_str
@@ -1417,6 +1432,9 @@ fn decorate_lint<'b>(
         if let Some(note) = self.note {
             diag.note(note.as_str());
         }
+        if let Some(sugg) = self.suggestion {
+            diag.subdiagnostic(sugg);
+        }
         diag
     }