1 files changed, 24 insertions, 2 deletions
diff --git a/src/tools/clippy/tests/ui/inherent_to_string.rs b/src/tools/clippy/tests/ui/inherent_to_string.rs
index aeb0a0c1e..adb0389a0 100644
--- a/src/tools/clippy/tests/ui/inherent_to_string.rs
+++ b/src/tools/clippy/tests/ui/inherent_to_string.rs
@@ -1,5 +1,4 @@
-#![warn(clippy::inherent_to_string)]
-#![deny(clippy::inherent_to_string_shadow_display)]
+#![allow(improper_ctypes_definitions)]
 
 use std::fmt;
 
@@ -14,6 +13,9 @@ struct D;
 struct E;
 struct F;
 struct G;
+struct H;
+struct I;
+struct J;
 
 impl A {
     // Should be detected; emit warning
@@ -80,6 +82,26 @@ impl G {
     }
 }
 
+// Issue #11201
+
+impl H {
+    unsafe fn to_string(&self) -> String {
+        "G.to_string()".to_string()
+    }
+}
+
+impl I {
+    extern "C" fn to_string(&self) -> String {
+        "G.to_string()".to_string()
+    }
+}
+
+impl J {
+    unsafe extern "C" fn to_string(&self) -> String {
+        "G.to_string()".to_string()
+    }
+}
+
 fn main() {
     let a = A;
     a.to_string();