1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/lazy-type-alias-impl-trait/branches.rs b/src/test/ui/lazy-type-alias-impl-trait/branches.rs
new file mode 100644
index 000000000..95239e2e3
--- /dev/null
+++ b/src/test/ui/lazy-type-alias-impl-trait/branches.rs
@@ -0,0 +1,25 @@
+#![feature(type_alias_impl_trait)]
+
+type Foo = impl std::fmt::Debug;
+
+fn foo(b: bool) -> Foo {
+    if b {
+        vec![42_i32]
+    } else {
+        std::iter::empty().collect()
+    }
+}
+
+type Bar = impl std::fmt::Debug;
+
+fn bar(b: bool) -> Bar {
+    let x: Bar = if b {
+        vec![42_i32]
+    } else {
+        std::iter::empty().collect()
+        //~^ ERROR  a value of type `Bar` cannot be built from an iterator over elements of type `_`
+    };
+    x
+}
+
+fn main() {}