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-rw-r--r--src/test/ui/issues/issue-30438-c.rs21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-30438-c.rs b/src/test/ui/issues/issue-30438-c.rs
new file mode 100644
index 000000000..4cf634245
--- /dev/null
+++ b/src/test/ui/issues/issue-30438-c.rs
@@ -0,0 +1,21 @@
+// Simplified regression test for #30438, inspired by arielb1.
+
+trait Trait { type Out; }
+
+struct Test<'a> { s: &'a str }
+
+fn silly<'y, 'z>(_s: &'y Test<'z>) -> &'y <Test<'z> as Trait>::Out where 'z: 'static {
+ //~^ WARN unnecessary lifetime parameter `'z`
+ let x = Test { s: "this cannot last" };
+ &x
+ //~^ ERROR: cannot return reference to local variable `x`
+}
+
+impl<'b> Trait for Test<'b> { type Out = Test<'b>; }
+
+fn main() {
+ let orig = Test { s: "Hello World" };
+ let r = silly(&orig);
+ println!("{}", orig.s); // OK since `orig` is valid
+ println!("{}", r.s); // Segfault (method does not return a sane value)
+}