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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]
}
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