1 files changed, 20 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-23046.rs b/src/test/ui/issues/issue-23046.rs
new file mode 100644
index 000000000..a68369616
--- /dev/null
+++ b/src/test/ui/issues/issue-23046.rs
@@ -0,0 +1,20 @@
+pub enum Expr<'var, VAR> {
+    Let(Box<Expr<'var, VAR>>,
+        Box<dyn for<'v> Fn(Expr<'v, VAR>) -> Expr<'v, VAR> + 'var>)
+}
+
+pub fn add<'var, VAR>
+                      (a: Expr<'var, VAR>, b: Expr<'var, VAR>) -> Expr<'var, VAR> {
+    loop {}
+}
+
+pub fn let_<'var, VAR, F: for<'v> Fn(Expr<'v, VAR>) -> Expr<'v, VAR>>
+                       (a: Expr<'var, VAR>, b: F) -> Expr<'var, VAR> {
+    loop {}
+}
+
+fn main() {
+    let ex = |x| { //~ ERROR type annotations needed
+        let_(add(x,x), |y| {
+            let_(add(x, x), |x|x)})};
+}