Fix `impl trait where` without `impl where`

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/14-where-on-trait.rs b/tests/14-where-on-trait.rs
new file mode 100644
index 0000000..56c7a4a
--- /dev/null
+++ b/tests/14-where-on-trait.rs
@@ -0,0 +1,25 @@
+// Checks that the impl trait can have where.
+
+use impl_trait::impl_trait;
+
+struct Foo<T>(T);
+trait Bar<U> {
+}
+
+impl_trait! {
+    impl<T> Foo<T> {
+        impl trait<U> Bar<U> where Self: From<U> {
+        }
+    }
+}
+impl From<()> for Foo<()> {
+    fn from(x: ()) -> Self {
+        Self { 0: x }
+    }
+}
+
+fn static_assert_1<T: Bar<U>, U>(_t: T, _u: U) {}
+
+fn main() {
+    static_assert_1(Foo(()), ());
+}