1 #![feature(stmt_expr_attributes)] 2 #![feature(custom_test_frameworks)] 3 main()4fn main() { 5 let _ = #[cfg(unset)] (); 6 //~^ ERROR removing an expression is not supported in this position 7 let _ = 1 + 2 + #[cfg(unset)] 3; 8 //~^ ERROR removing an expression is not supported in this position 9 let _ = [1, 2, 3][#[cfg(unset)] 1]; 10 //~^ ERROR removing an expression is not supported in this position 11 } 12