Make hidden type registration opt-in, so that each site can be reviewed on its own and we have the right defaults for trait solvers

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/ui/type-alias-impl-trait/match-unification.rs b/tests/ui/type-alias-impl-trait/match-unification.rs
new file mode 100644
index 00000000000..f5c2abc0efa
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/match-unification.rs
@@ -0,0 +1,14 @@
+use std::fmt::Debug;
+
+// check-pass
+
+fn bar() -> impl Debug {}
+
+fn baz(b: bool) -> Option<impl Debug> {
+    match b {
+        true => baz(false),
+        false => Some(bar()),
+    }
+}
+
+fn main() {}