44 lines
1.8 KiB
Rust
44 lines
1.8 KiB
Rust
// 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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#![feature(fn_traits)]
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struct Foo;
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impl Fn<()> for Foo {
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//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
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//~| ERROR manual implementations of `Fn` are experimental
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//~| ERROR expected a `FnMut()` closure, found `Foo`
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extern "rust-call" fn call(self, args: ()) -> () {}
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//~^ ERROR rust-call ABI is subject to change
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//~| ERROR `call` has an incompatible type for trait
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}
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struct Foo1;
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impl FnOnce() for Foo1 {
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//~^ ERROR associated item constraints are not allowed here
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//~| ERROR manual implementations of `FnOnce` are experimental
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//~| ERROR not all trait items implemented
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extern "rust-call" fn call_once(self, args: ()) -> () {}
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//~^ ERROR rust-call ABI is subject to change
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}
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struct Bar;
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impl FnMut<()> for Bar {
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//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
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//~| ERROR manual implementations of `FnMut` are experimental
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//~| ERROR expected a `FnOnce()` closure, found `Bar`
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extern "rust-call" fn call_mut(&self, args: ()) -> () {}
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//~^ ERROR rust-call ABI is subject to change
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//~| ERROR incompatible type for trait
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}
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struct Baz;
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impl FnOnce<()> for Baz {
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//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
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//~| ERROR manual implementations of `FnOnce` are experimental
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//~| ERROR not all trait items implemented
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extern "rust-call" fn call_once(&self, args: ()) -> () {}
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//~^ ERROR rust-call ABI is subject to change
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}
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fn main() {}
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