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-rw-r--r--tests/ui/codegen/mono-impossible-2.rs19
1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/codegen/mono-impossible-2.rs b/tests/ui/codegen/mono-impossible-2.rs
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index 000000000..21eb2c9b2
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+++ b/tests/ui/codegen/mono-impossible-2.rs
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+//compile-flags: --crate-type=lib -Clink-dead-code=on
+// build-pass
+
+// Make sure that we don't monomorphize the impossible method `<() as Visit>::visit`,
+// which does not hold under a reveal-all param env.
+
+pub trait Visit {
+ fn visit() {}
+}
+
+pub trait Array {
+ type Element;
+}
+
+impl<'a> Visit for () where (): Array<Element = &'a ()> {}
+
+impl Array for () {
+ type Element = ();
+}