tests/ui/lint/issue-17718-const-naming.rs - toolchain/rustc - Git at Google

 #![warn(unused)]
 #![deny(warnings)]

 const foo: isize = 3;
 //~^ ERROR: should have an upper case name
 //~^^ ERROR: constant `foo` is never used

 fn main() {}
	#![warn(unused)]
	#![deny(warnings)]

	const foo: isize = 3;
	//~^ ERROR: should have an upper case name
	//~^^ ERROR: constant `foo` is never used

	fn main() {}