| fn t7p<A, B, C>(f: impl Fn(B) -> C, g: impl Fn(A) -> B) -> impl Fn(A) -> C { | |
| move |a: A| -> C { f(g(a)) } | |
| } | |
| fn t8n<A, B, C>(f: impl Fn(A) -> B, g: impl Fn(A) -> C) -> impl Fn(A) -> (B, C) | |
| where | |
| A: Copy, | |
| { | |
| move |a: A| -> (B, C) { | |
| let b = a; | |
| let fa = f(a); | |
| let ga = g(b); | |
| (fa, ga) | |
| } | |
| } | |
| fn main() { | |
| let f = |(_, _)| {}; | |
| let g = |(a, _)| a; | |
| let t7 = |env| |a| |b| t7p(f, g)(((env, a), b)); | |
| let t8 = t8n(t7, t7p(f, g)); | |
| //~^ ERROR: expected a `Fn(_)` closure, found `impl Fn(((_, _), _))` [E0277] | |
| } |