tests/ui/higher-rank-trait-bounds/hrtb-malformed-lifetime-generics.rs

   1 // Test that Fn-family traits with lifetime parameters shouldn't compile and
   2 // we suggest the usage of higher-rank trait bounds instead.
   3
   4 fn fa(_: impl Fn<'a>(&'a str) -> bool) {}
   5 //~^ ERROR `Fn` traits cannot take lifetime parameters
   6
   7 fn fb(_: impl FnMut<'a, 'b>(&'a str, &'b str) -> bool) {}
   8 //~^ ERROR `Fn` traits cannot take lifetime parameters
   9
  10 fn fc(_: impl std::fmt::Display + FnOnce<'a>(&'a str) -> bool + std::fmt::Debug) {}
  11 //~^ ERROR `Fn` traits cannot take lifetime parameters
  12
  13 use std::ops::Fn as AliasedFn;
  14 fn fd(_: impl AliasedFn<'a>(&'a str) -> bool) {}
  15 //~^ ERROR `Fn` traits cannot take lifetime parameters
  16
  17 fn fe<F>(_: F) where F: Fn<'a>(&'a str) -> bool {}
  18 //~^ ERROR `Fn` traits cannot take lifetime parameters
  19
  20 fn main() {}