Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/ui/chalkify/type_inference.rs b/tests/ui/chalkify/type_inference.rs
new file mode 100644
index 000000000..d7167d0dc
--- /dev/null
+++ b/tests/ui/chalkify/type_inference.rs
@@ -0,0 +1,28 @@
+// compile-flags: -Z trait-solver=chalk
+
+trait Foo { }
+impl Foo for i32 { }
+
+trait Bar { }
+impl Bar for i32 { }
+impl Bar for u32 { }
+
+fn only_foo<T: Foo>(_x: T) { }
+
+fn only_bar<T: Bar>(_x: T) { }
+
+fn main() {
+    let x = 5.0;
+
+    // The only type which implements `Foo` is `i32`, so the chalk trait solver
+    // is expecting a variable of type `i32`. This behavior differs from the
+    // old-style trait solver. I guess this will change, that's why I'm
+    // adding that test.
+    // FIXME(chalk): order of these two errors is non-deterministic,
+    // so let's just hide one for now
+    //only_foo(x); // ERROR the trait bound `f64: Foo` is not satisfied
+
+    // Here we have two solutions so we get back the behavior of the old-style
+    // trait solver.
+    only_bar(x); //~ ERROR the trait bound `{float}: Bar` is not satisfied
+}