Rollup merge of rust-lang#122251 - jieyouxu:unused-lifetimes-dedup-te…

…st, r=Nadrieril Add test to check unused_lifetimes don't duplicate "parameter is never used" error Closes rust-lang#72587.
jhpratt · Mar 10, 2024 · b1a7bc2 · b1a7bc2
2 parents bb3f082 + ff1459a
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diff --git a/tests/ui/single-use-lifetime/dedup.rs b/tests/ui/single-use-lifetime/dedup.rs
@@ -0,0 +1,9 @@
+// Check that `unused_lifetimes` lint doesn't duplicate a "parameter is never used" error.
+// Fixed in <https://github.com/rust-lang/rust/pull/96833>.
+// Issue: <https://github.com/rust-lang/rust/issues/72587>.
+
+#![warn(unused_lifetimes)]
+struct Foo<'a>;
+//~^ ERROR parameter `'a` is never used
+
+fn main() {}
diff --git a/tests/ui/single-use-lifetime/dedup.stderr b/tests/ui/single-use-lifetime/dedup.stderr
@@ -0,0 +1,11 @@
+error[E0392]: lifetime parameter `'a` is never used
+  --> $DIR/dedup.rs:6:12
+   |
+LL | struct Foo<'a>;
+   |            ^^ unused lifetime parameter
+   |
+   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0392`.