mirror of https://github.com/rust-lang/rust
75 lines
1.6 KiB
Rust
75 lines
1.6 KiB
Rust
//@ run-pass
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// Check that tautalogically false bounds are accepted, and are used
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// in type inference.
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#![feature(trivial_bounds)]
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#![allow(unused)]
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pub trait Foo {
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fn test(&self);
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}
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fn generic_function<X: Foo>(x: X) {}
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enum E where i32: Foo { V } //~ WARNING trivial_bounds
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struct S where i32: Foo; //~ WARNING trivial_bounds
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trait T where i32: Foo {} //~ WARNING trivial_bounds
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union U where i32: Foo { f: i32 } //~ WARNING trivial_bounds
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type Y where i32: Foo = ();
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//~^ WARNING type_alias_bounds
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//~| WARNING trivial_bounds
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impl Foo for () where i32: Foo { //~ WARNING trivial_bounds
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fn test(&self) {
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3i32.test();
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Foo::test(&4i32);
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generic_function(5i32);
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}
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}
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fn f() where i32: Foo { //~ WARNING trivial_bounds
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let s = S;
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3i32.test();
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Foo::test(&4i32);
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generic_function(5i32);
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}
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fn g() where &'static str: Foo { //~ WARNING trivial_bounds
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"Foo".test();
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Foo::test(&"Foo");
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generic_function("Foo");
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}
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trait A {}
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impl A for i32 {}
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struct Dst<X: ?Sized> {
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x: X,
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}
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struct TwoStrs(str, str) where str: Sized; //~ WARNING trivial_bounds
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fn unsized_local() where for<'a> Dst<dyn A + 'a>: Sized { //~ WARNING trivial_bounds
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let x: Dst<dyn A> = *(Box::new(Dst { x: 1 }) as Box<Dst<dyn A>>);
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}
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fn return_str() -> str where str: Sized { //~ WARNING trivial_bounds
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*"Sized".to_string().into_boxed_str()
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}
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fn use_op(s: String) -> String where String: ::std::ops::Neg<Output=String> {
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//~^ WARNING trivial_bounds
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-s
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}
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fn use_for() where i32: Iterator { //~ WARNING trivial_bounds
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for _ in 2i32 {}
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}
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fn main() {}
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