add test for ice 83056 "bad input type for cast"

Fixes #83056

Author: matthiaskrgr

tests/ui/consts/ice-bad-input-type-for-cast-83056.rs

@@ -0,0 +1,6 @@
+// #83056 ICE "bad input type for cast"
+
+struct S([bool; f as usize]);
+fn f() -> T {}
+//~^ ERROR cannot find type `T` in this scope
+pub fn main() {}

tests/ui/consts/ice-bad-input-type-for-cast-83056.stderr

@@ -0,0 +1,20 @@
+error[E0412]: cannot find type `T` in this scope
+  --> $DIR/ice-bad-input-type-for-cast-83056.rs:4:11
+   |
+LL | struct S([bool; f as usize]);
+   | ----------------------------- similarly named struct `S` defined here
+LL | fn f() -> T {}
+   |           ^
+   |
+help: a struct with a similar name exists
+   |
+LL | fn f() -> S {}
+   |           ~
+help: you might be missing a type parameter
+   |
+LL | fn f<T>() -> T {}
+   |     +++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0412`.