src/test/ui/issues/issue-59494.rs

   1 fn t7p<A, B, C>(f: impl Fn(B) -> C, g: impl Fn(A) -> B) -> impl Fn(A) -> C {
   2     move |a: A| -> C { f(g(a)) }
   3 }
   4
   5 fn t8n<A, B, C>(f: impl Fn(A) -> B, g: impl Fn(A) -> C) -> impl Fn(A) -> (B, C)
   6 where
   7     A: Copy,
   8 {
   9     move |a: A| -> (B, C) {
  10         let b = a;
  11         let fa = f(a);
  12         let ga = g(b);
  13         (fa, ga)
  14     }
  15 }
  16
  17 fn main() {
  18     let f = |(_, _)| {};
  19     let g = |(a, _)| a;
  20     let t7 = |env| |a| |b| t7p(f, g)(((env, a), b));
  21     let t8 = t8n(t7, t7p(f, g));
  22     //~^ ERROR: expected a `Fn<(_,)>` closure, found `impl Fn(((_, _), _))` [E0277]
  23 }