src/test/ui/issues/issue-41255.rs

   1 // Matching against float literals should result in a linter error
   2
   3 #![feature(exclusive_range_pattern)]
   4 #![feature(half_open_range_patterns)]
   5 #![allow(unused)]
   6 #![forbid(illegal_floating_point_literal_pattern)]
   7
   8 fn main() {
   9     let x = 42.0;
  10     match x {
  11         5.0 => {}, //~ ERROR floating-point types cannot be used in patterns
  12                    //~| WARNING hard error
  13         5.0f32 => {}, //~ ERROR floating-point types cannot be used in patterns
  14                       //~| WARNING hard error
  15         -5.0 => {}, //~ ERROR floating-point types cannot be used in patterns
  16                     //~| WARNING hard error
  17         1.0 .. 33.0 => {}, //~ ERROR floating-point types cannot be used in patterns
  18                            //~| WARNING hard error
  19                            //~| ERROR floating-point types cannot be used in patterns
  20                            //~| WARNING hard error
  21         39.0 ..= 70.0 => {}, //~ ERROR floating-point types cannot be used in patterns
  22                              //~| ERROR floating-point types cannot be used in patterns
  23                              //~| WARNING hard error
  24                              //~| WARNING hard error
  25
  26         ..71.0 => {}
  27         //~^ ERROR floating-point types cannot be used in patterns
  28         //~| WARNING this was previously accepted by the compiler
  29         ..=72.0 => {}
  30         //~^ ERROR floating-point types cannot be used in patterns
  31         //~| WARNING this was previously accepted by the compiler
  32         71.0.. => {}
  33         //~^ ERROR floating-point types cannot be used in patterns
  34         //~| WARNING this was previously accepted by the compiler
  35         _ => {},
  36     };
  37     let y = 5.0;
  38     // Same for tuples
  39     match (x, 5) {
  40         (3.14, 1) => {}, //~ ERROR floating-point types cannot be used
  41                          //~| WARNING hard error
  42         _ => {},
  43     }
  44     // Or structs
  45     struct Foo { x: f32 };
  46     match (Foo { x }) {
  47         Foo { x: 2.0 } => {}, //~ ERROR floating-point types cannot be used
  48                               //~| WARNING hard error
  49         _ => {},
  50     }
  51 }