mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 06:51:58 +00:00
24 lines
563 B
Rust
24 lines
563 B
Rust
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]
|
|
}
|