X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=tests%2Fui%2Ftraits%2Fnew-solver%2Fprovisional-result-done.rs;fp=tests%2Fui%2Ftraits%2Fnew-solver%2Fprovisional-result-done.rs;h=a3d97927bad2222037e19e1b5baa705e897a2278;hb=e7acd078f443156b95cee11759a735db1cfc796e;hp=0000000000000000000000000000000000000000;hpb=575d424c94e0d4feea8cf4fcf04d47b83f28eaef;p=rust.git

diff --git a/tests/ui/traits/new-solver/provisional-result-done.rs b/tests/ui/traits/new-solver/provisional-result-done.rs
new file mode 100644
index 00000000000..a3d97927bad
--- /dev/null
+++ b/tests/ui/traits/new-solver/provisional-result-done.rs
@@ -0,0 +1,37 @@
+// known-bug: unknown
+// compile-flags: -Ztrait-solver=next
+// failure-status: 101
+// normalize-stderr-test "note: .*\n\n" -> ""
+// normalize-stderr-test "thread 'rustc' panicked.*\n" -> ""
+// rustc-env:RUST_BACKTRACE=0
+
+// This tests checks that we update results in the provisional cache when
+// we pop a goal from the stack.
+#![feature(auto_traits)]
+auto trait Coinductive {}
+struct Foo<T>(T);
+struct Bar<T>(T);
+
+impl<T> Coinductive for Foo<T>
+where
+    Bar<T>: Coinductive
+{}
+
+impl<T> Coinductive for Bar<T>
+where
+    Foo<T>: Coinductive,
+    Bar<T>: ConstrainInfer,
+{}
+
+trait ConstrainInfer {}
+impl ConstrainInfer for Bar<u8> {}
+impl ConstrainInfer for Foo<u16> {}
+
+fn impls<T: Coinductive>() -> T { todo!() }
+
+fn constrain<T: ConstrainInfer>(_: T) {}
+
+fn main() {
+    // This should constrain `_` to `u8`.
+    impls::<Foo<_>>();
+}