src/tools/clippy/tests/ui/modulo_one.rs

   1 #![warn(clippy::modulo_one)]
   2 #![allow(clippy::no_effect, clippy::unnecessary_operation, clippy::identity_op)]
   3
   4 static STATIC_ONE: usize = 2 - 1;
   5 static STATIC_NEG_ONE: i64 = 1 - 2;
   6
   7 fn main() {
   8     10 % 1;
   9     //~^ ERROR: any number modulo 1 will be 0
  10     //~| NOTE: `-D clippy::modulo-one` implied by `-D warnings`
  11     10 % -1;
  12     //~^ ERROR: any number modulo -1 will panic/overflow or result in 0
  13     10 % 2;
  14     // also caught by rustc
  15     i32::MIN % (-1);
  16     //~^ ERROR: this operation will panic at runtime
  17     //~| NOTE: `#[deny(unconditional_panic)]` on by default
  18     //~| ERROR: any number modulo -1 will panic/overflow or result in 0
  19
  20     const ONE: u32 = 1 * 1;
  21     const NEG_ONE: i64 = 1 - 2;
  22     const INT_MIN: i64 = i64::MIN;
  23
  24     2 % ONE;
  25     //~^ ERROR: any number modulo 1 will be 0
  26     // NOT caught by lint
  27     5 % STATIC_ONE;
  28     2 % NEG_ONE;
  29     //~^ ERROR: any number modulo -1 will panic/overflow or result in 0
  30     // NOT caught by lint
  31     5 % STATIC_NEG_ONE;
  32     // also caught by rustc
  33     INT_MIN % NEG_ONE;
  34     //~^ ERROR: this operation will panic at runtime
  35     //~| ERROR: any number modulo -1 will panic/overflow or result in 0
  36     // ONLY caught by rustc
  37     INT_MIN % STATIC_NEG_ONE;
  38     //~^ ERROR: this operation will panic at runtime
  39 }