mirror of https://github.com/rust-lang/rust
33 lines
683 B
Rust
33 lines
683 B
Rust
//@ compile-flags: -Zpolymorphize=on -Zinline-mir=yes -Zmir-opt-level=0
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#![feature(fn_traits, unboxed_closures)]
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struct Foo<T>(T);
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impl<T: Copy> Fn<()> for Foo<T> {
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extern "C" fn call(&self, _: ()) -> T {
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//~^ ERROR method `call` has an incompatible type for trait
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match *self {
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Foo(t) => t,
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}
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}
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}
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impl<T: Copy> FnMut<()> for Foo<T> {
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extern "rust-call" fn call_mut(&mut self, _: ()) -> T {
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self.call(())
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}
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}
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impl<T: Copy> FnOnce<()> for Foo<T> {
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type Output = T;
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extern "rust-call" fn call_once(self, _: ()) -> T {
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self.call(())
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}
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}
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fn main() {
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let t: u8 = 1;
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println!("{}", Foo(t)());
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}
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