Add ui test func-pointer-issue-140491

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

Author: xizheyin

tests/ui/cast/func-pointer-issue-140491.rs

@@ -0,0 +1,7 @@
+fn my_fn(event: &Event<'_>) {}
+
+struct Event<'a>(&'a ());
+
+fn main() {
+    const ptr: &fn(&Event<'_>) = &my_fn as _; //~ ERROR non-primitive cast: `&for<'a, 'b> fn(&'a Event<'b>) {my_fn}` as `&for<'a, 'b> fn(&'a Event<'b>)` [E0605]
+}

tests/ui/cast/func-pointer-issue-140491.stderr

@@ -0,0 +1,9 @@
+error[E0605]: non-primitive cast: `&for<'a, 'b> fn(&'a Event<'b>) {my_fn}` as `&for<'a, 'b> fn(&'a Event<'b>)`
+  --> $DIR/func-pointer-issue-140491.rs:6:34
+   |
+LL | ..._>) = &my_fn as _;
+   |          ^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0605`.