src/test/ui/const-generics/bad-const-generic-exprs.rs

   1 struct Wow<const N: usize>;
   2
   3 fn main() {
   4     let _: Wow<if true {}>;
   5     //~^ ERROR invalid const generic expression
   6     //~| HELP expressions must be enclosed in braces to be used as const generic arguments
   7     let _: Wow<|| ()>;
   8     //~^ ERROR invalid const generic expression
   9     //~| HELP expressions must be enclosed in braces to be used as const generic arguments
  10     let _: Wow<A.b>;
  11     //~^ ERROR expected one of
  12     //~| HELP expressions must be enclosed in braces to be used as const generic arguments
  13     let _: Wow<A.0>;
  14     //~^ ERROR expected one of
  15     //~| HELP expressions must be enclosed in braces to be used as const generic arguments
  16
  17     // FIXME(compiler-errors): This one is still unsatisfying,
  18     // and probably a case I could see someone typing by accident..
  19     let _: Wow<[12]>;
  20     //~^ ERROR expected type, found
  21     //~| ERROR type provided when a constant was expected
  22 }