09783d1dab
explicit form `Fn<A,B>` and now should use `Fn(A) -> B` or `Fn<A,Output=B>`, but in some cases we get duplicate error reports. This is mildly annoying and arises because of the main error and another error from the projection. Might be worth squashing those, but seems like a separate problem.
47 lines
1.5 KiB
Rust
47 lines
1.5 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test that manual impls of the `Fn` traits are not possible without
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// a feature gate. In fact, the specialized check for these cases
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// never triggers (yet), because they encounter other problems around
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// angle bracket vs parentheses notation.
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#![allow(dead_code)]
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struct Foo;
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impl Fn<()> for Foo {
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//~^ ERROR angle-bracket notation is not stable when used with the `Fn` family of traits
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type Output = ();
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extern "rust-call" fn call(&self, args: ()) -> () {}
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}
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struct Foo1;
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impl Fn() for Foo1 {
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//~^ ERROR associated type bindings are not allowed here
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extern "rust-call" fn call(&self, args: ()) -> () {}
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}
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struct Bar;
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impl FnMut<()> for Bar {
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//~^ ERROR angle-bracket notation is not stable when used with the `Fn` family of traits
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type Output = ();
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extern "rust-call" fn call_mut(&self, args: ()) -> () {}
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}
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struct Baz;
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impl FnOnce<()> for Baz {
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//~^ ERROR angle-bracket notation is not stable when used with the `Fn` family of traits
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type Output = ();
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extern "rust-call" fn call_once(&self, args: ()) -> () {}
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}
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fn main() {}
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