Add test

tests/ui/consts/ice-issue-125873.rs

@@ -0,0 +1,16 @@
+// Test for ICE: cannot convert ReLateParam to a region vid
+// https://github.com/rust-lang/rust/issues/125873
+
+fn foo() {
+    let a = for<'a> |b: &'a ()| -> &'a () {
+    //~^ `for<...>` binders for closures are experimental
+        const {
+            let awd = ();
+            let _: &'a () = &awd;
+            //~^ `awd` does not live long enough
+        };
+        b
+    };
+}
+
+fn main() {}

tests/ui/consts/ice-issue-125873.stderr

@@ -0,0 +1,31 @@
+error[E0658]: `for<...>` binders for closures are experimental
+  --> $DIR/ice-issue-125873.rs:5:13
+   |
+LL |     let a = for<'a> |b: &'a ()| -> &'a () {
+   |             ^^^^^^^
+   |
+   = note: see issue #97362 <https://github.com/rust-lang/rust/issues/97362> for more information
+   = help: add `#![feature(closure_lifetime_binder)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+   = help: consider removing `for<...>`
+
+error[E0597]: `awd` does not live long enough
+  --> $DIR/ice-issue-125873.rs:9:29
+   |
+LL |     let a = for<'a> |b: &'a ()| -> &'a () {
+   |                 -- lifetime `'a` defined here
+...
+LL |             let awd = ();
+   |                 --- binding `awd` declared here
+LL |             let _: &'a () = &awd;
+   |                    ------   ^^^^ borrowed value does not live long enough
+   |                    |
+   |                    type annotation requires that `awd` is borrowed for `'a`
+LL |
+LL |         };
+   |         - `awd` dropped here while still borrowed
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0597, E0658.
+For more information about an error, try `rustc --explain E0597`.