error: the operation is ineffective. Consider reducing it to `x` --> $DIR/identity_op.rs:13:5 | 13 | x + 0; | ^^^^^ | = note: `-D identity-op` implied by `-D warnings` error: the operation is ineffective. Consider reducing it to `x` --> $DIR/identity_op.rs:14:5 | 14 | x + (1 - 1); | ^^^^^^^^^^^ error: the operation is ineffective. Consider reducing it to `x` --> $DIR/identity_op.rs:16:5 | 16 | 0 + x; | ^^^^^ error: the operation is ineffective. Consider reducing it to `x` --> $DIR/identity_op.rs:19:5 | 19 | x | (0); | ^^^^^^^ error: the operation is ineffective. Consider reducing it to `x` --> $DIR/identity_op.rs:22:5 | 22 | x * 1; | ^^^^^ error: the operation is ineffective. Consider reducing it to `x` --> $DIR/identity_op.rs:23:5 | 23 | 1 * x; | ^^^^^ error: the operation is ineffective. Consider reducing it to `x` --> $DIR/identity_op.rs:29:5 | 29 | -1 & x; | ^^^^^^ error: the operation is ineffective. Consider reducing it to `u` --> $DIR/identity_op.rs:32:5 | 32 | u & 255; | ^^^^^^^ error: aborting due to 8 previous errors