tests/ui/enum-discriminant/issue-41394.rs - toolchain/rustc - Git at Google

 enum Foo {
     A = "" + 1
     //~^ ERROR cannot add `{integer}` to `&str`
 }

 enum Bar {
     A = Foo::A as isize
 }

 fn main() {}
	enum Foo {
	A = "" + 1
	//~^ ERROR cannot add `{integer}` to `&str`
	}

	enum Bar {
	A = Foo::A as isize
	}

	fn main() {}