7f427f86bd
Option::map, for example, looks like this:
option<t>, (t -> u) -> option<u>
This syntax searches all of the HOFs in Rust: traits Fn, FnOnce,
and FnMut, and bare fn primitives.
13 lines
379 B
Rust
13 lines
379 B
Rust
#![feature(never_type)]
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pub struct First<T>(T);
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pub struct Second<T>(T);
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pub struct Third<T>(T);
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pub fn fn_ptr(_: fn (First<u32>) -> !, _: bool) {}
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pub fn fn_once(_: impl FnOnce (Second<u32>) -> !, _: u8) {}
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pub fn fn_mut(_: impl FnMut (Third<u32>) -> !, _: i8) {}
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pub fn fn_(_: impl Fn (u32) -> !, _: char) {}
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pub fn multiple(_: impl Fn(&'static str, &'static str) -> i8) {}
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