Add 86703

Issue: rust-lang/rust#86703

Author: fanninpm

ices/86703.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+rustc -C link-dead-code - <<'EOF'
+trait Yokeable<'a> {
+    type Output: 'a;
+}
+
+fn project(_: for<'a> fn(<() as Yokeable<'a>>::Output)) {}
+
+impl<'a> Yokeable<'a> for () {
+    type Output = ();
+}
+
+fn crash() {
+    project(|_| {});
+}
+
+fn main() {}
+EOF