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-rw-r--r--tests/ui/traits/new-solver/stall-num-var-auto-trait.rs25
1 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/stall-num-var-auto-trait.rs b/tests/ui/traits/new-solver/stall-num-var-auto-trait.rs
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index 000000000..0539c3a42
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+++ b/tests/ui/traits/new-solver/stall-num-var-auto-trait.rs
@@ -0,0 +1,25 @@
+// compile-flags: -Ztrait-solver=next
+// revisions: fallback constrain
+//[constrain] check-pass
+
+// Tests that we stall the `{integer}: Foo` obligation until after we
+// constrain the int type (or fallback occurs).
+
+#![feature(negative_impls, auto_traits)]
+
+auto trait Foo {}
+
+impl !Foo for i32 {}
+
+fn needs_foo(x: impl Foo) {}
+
+fn main() {
+ let mut x = 0;
+ needs_foo(x);
+ //[fallback]~^ ERROR the trait bound `i32: Foo` is not satisfied
+
+ #[cfg(constrain)]
+ {
+ x = 1u64;
+ }
+}