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-rw-r--r--tests/ui/match/match-ref-mut-let-invariance.rs16
1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/match/match-ref-mut-let-invariance.rs b/tests/ui/match/match-ref-mut-let-invariance.rs
new file mode 100644
index 000000000..a33be09ac
--- /dev/null
+++ b/tests/ui/match/match-ref-mut-let-invariance.rs
@@ -0,0 +1,16 @@
+// Check that when making a ref mut binding with type `&mut T`, the
+// type `T` must match precisely the type `U` of the value being
+// matched, and in particular cannot be some supertype of `U`. Issue
+// #23116. This test focuses on a `let`.
+
+#![allow(dead_code)]
+struct S<'b>(&'b i32);
+impl<'b> S<'b> {
+ fn bar<'a>(&'a mut self) -> &'a mut &'a i32 {
+ let ref mut x = self.0;
+ x
+ //~^ ERROR lifetime may not live long enough
+ }
+}
+
+fn main() {}