From 607d30dcfa8c40b91d0073a18c5897eee00a4cda Mon Sep 17 00:00:00 2001
From: samlich <1349989+samlich@users.noreply.github.com>
Date: Tue, 29 Sep 2020 19:46:01 +0000
Subject: [PATCH] Add test for issue #74761
---
src/test/ui/type-alias-impl-trait/issue-74761.rs | 16 ++++++++++++++++
.../ui/type-alias-impl-trait/issue-74761.stderr | 15 +++++++++++++++
2 files changed, 31 insertions(+)
create mode 100644 src/test/ui/type-alias-impl-trait/issue-74761.rs
create mode 100644 src/test/ui/type-alias-impl-trait/issue-74761.stderr
diff --git a/src/test/ui/type-alias-impl-trait/issue-74761.rs b/src/test/ui/type-alias-impl-trait/issue-74761.rs
new file mode 100644
index 0000000000000..4345b5d886ee2
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-74761.rs
@@ -0,0 +1,16 @@
+#![feature(member_constraints)]
+#![feature(type_alias_impl_trait)]
+
+pub trait A {
+ type B;
+ fn f(&self) -> Self::B;
+}
+impl<'a, 'b> A for () {
+ //~^ ERROR the lifetime parameter `'a` is not constrained
+ //~| ERROR the lifetime parameter `'b` is not constrained
+ type B = impl core::fmt::Debug;
+
+ fn f(&self) -> Self::B {}
+}
+
+fn main() {}
diff --git a/src/test/ui/type-alias-impl-trait/issue-74761.stderr b/src/test/ui/type-alias-impl-trait/issue-74761.stderr
new file mode 100644
index 0000000000000..3f38fa4de0165
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-74761.stderr
@@ -0,0 +1,15 @@
+error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
+ --> $DIR/issue-74761.rs:8:6
+ |
+LL | impl<'a, 'b> A for () {
+ | ^^ unconstrained lifetime parameter
+
+error[E0207]: the lifetime parameter `'b` is not constrained by the impl trait, self type, or predicates
+ --> $DIR/issue-74761.rs:8:10
+ |
+LL | impl<'a, 'b> A for () {
+ | ^^ unconstrained lifetime parameter
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0207`.