From 43a08bd29969be0f8b83a525b46cfa9e4b99e863 Mon Sep 17 00:00:00 2001
From: clubby789 <jamie@hill-daniel.co.uk>
Date: Mon, 16 Oct 2023 15:40:32 +0000
Subject: [PATCH] Add test for 113326

---
 .../type-alias-impl-trait/recursive-fn-tait.rs  | 17 +++++++++++++++++
 .../recursive-fn-tait.stderr                    | 14 ++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 tests/ui/type-alias-impl-trait/recursive-fn-tait.rs
 create mode 100644 tests/ui/type-alias-impl-trait/recursive-fn-tait.stderr

diff --git a/tests/ui/type-alias-impl-trait/recursive-fn-tait.rs b/tests/ui/type-alias-impl-trait/recursive-fn-tait.rs
new file mode 100644
index 0000000000000..3d1759097d6b3
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/recursive-fn-tait.rs
@@ -0,0 +1,17 @@
+// test for #113326
+#![feature(type_alias_impl_trait)]
+
+pub type Diff = impl Fn(usize) -> usize;
+
+pub fn lift() -> Diff {
+    |_: usize |loop {}
+}
+
+pub fn add(
+    n: Diff,
+    m: Diff,
+) -> Diff {
+    move |x: usize| m(n(x)) //~ ERROR: concrete type differs
+}
+
+fn main() {}
diff --git a/tests/ui/type-alias-impl-trait/recursive-fn-tait.stderr b/tests/ui/type-alias-impl-trait/recursive-fn-tait.stderr
new file mode 100644
index 0000000000000..b2898a21190ad
--- /dev/null
+++ b/tests/ui/type-alias-impl-trait/recursive-fn-tait.stderr
@@ -0,0 +1,14 @@
+error: concrete type differs from previous defining opaque type use
+  --> $DIR/recursive-fn-tait.rs:14:5
+   |
+LL |     move |x: usize| m(n(x))
+   |     ^^^^^^^^^^^^^^^^^^^^^^^ expected `{closure@$DIR/recursive-fn-tait.rs:7:5: 7:16}`, got `{closure@$DIR/recursive-fn-tait.rs:14:5: 14:20}`
+   |
+note: previous use here
+  --> $DIR/recursive-fn-tait.rs:7:5
+   |
+LL |     |_: usize |loop {}
+   |     ^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+