add test for dead code caused by enum variants shadowing an associated function

Author: jdonszelmann

tests/ui/enum/dead-code-associated-function.rs

@@ -0,0 +1,16 @@
+//@ check-pass
+#![warn(dead_code)]
+
+enum E {
+    V(),
+}
+
+impl E {
+    #[expect(non_snake_case)]
+    fn V() {}
+    //~^ WARN: associated function `V` is never used
+}
+
+fn main() {
+    let _: E = E::V();
+}

tests/ui/enum/dead-code-associated-function.stderr

@@ -0,0 +1,17 @@
+warning: associated function `V` is never used
+  --> $DIR/dead-code-associated-function.rs:10:8
+   |
+LL | impl E {
+   | ------ associated function in this implementation
+LL |     #[expect(non_snake_case)]
+LL |     fn V() {}
+   |        ^
+   |
+note: the lint level is defined here
+  --> $DIR/dead-code-associated-function.rs:2:9
+   |
+LL | #![warn(dead_code)]
+   |         ^^^^^^^^^
+
+warning: 1 warning emitted
+