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-rw-r--r--src/test/ui/associated-types/associated-types-outlives.rs28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/associated-types-outlives.rs b/src/test/ui/associated-types/associated-types-outlives.rs
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index 000000000..55c276280
--- /dev/null
+++ b/src/test/ui/associated-types/associated-types-outlives.rs
@@ -0,0 +1,28 @@
+// Regression test for issue #24622. The older associated types code
+// was erroneously assuming that all projections outlived the current
+// fn body, causing this (invalid) code to be accepted.
+
+pub trait Foo<'a> {
+ type Bar;
+}
+
+impl<'a, T:'a> Foo<'a> for T {
+ type Bar = &'a T;
+}
+
+fn denormalise<'a, T>(t: &'a T) -> <T as Foo<'a>>::Bar {
+ t
+}
+
+pub fn free_and_use<T: for<'a> Foo<'a>,
+ F: for<'a> FnOnce(<T as Foo<'a>>::Bar)>(x: T, f: F) {
+ let y;
+ 'body: loop { // lifetime annotations added for clarity
+ 's: loop { y = denormalise(&x); break }
+ drop(x); //~ ERROR cannot move out of `x` because it is borrowed
+ return f(y);
+ }
+}
+
+pub fn main() {
+}