Always test NumAssignRef

build.rs

@@ -10,7 +10,6 @@ fn main() {
 
     ac.emit_expression_cfg("1u32.reverse_bits()", "has_reverse_bits");
     ac.emit_expression_cfg("1u32.trailing_ones()", "has_leading_trailing_ones");
-    ac.emit_expression_cfg("{ let mut x = 1; x += &2; }", "has_int_assignop_ref");
     ac.emit_expression_cfg("1u32.div_euclid(1u32)", "has_div_euclid");
 
     if env::var_os("CARGO_FEATURE_STD").is_some() {

src/lib.rs

@@ -624,7 +624,6 @@ fn check_numassign_ops() {
     assert_eq!(compute(1, 2), 1)
 }
 
-#[cfg(has_int_assignop_ref)]
 #[test]
 fn check_numassignref_ops() {
     fn compute<T: NumAssignRef + Copy>(mut x: T, y: &T) -> T {