26 lines
502 B
Rust
26 lines
502 B
Rust
// compile-flags: -Ztrait-solver=next
|
|
// revisions: fallback constrain
|
|
//[constrain] check-pass
|
|
|
|
// Tests that we stall the `{integer}: Foo` obligation until after we
|
|
// constrain the int type (or fallback occurs).
|
|
|
|
#![feature(negative_impls, auto_traits)]
|
|
|
|
auto trait Foo {}
|
|
|
|
impl !Foo for i32 {}
|
|
|
|
fn needs_foo(x: impl Foo) {}
|
|
|
|
fn main() {
|
|
let mut x = 0;
|
|
needs_foo(x);
|
|
//[fallback]~^ ERROR the trait bound `i32: Foo` is not satisfied
|
|
|
|
#[cfg(constrain)]
|
|
{
|
|
x = 1u64;
|
|
}
|
|
}
|