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