Test safe_trait_negative_impl_mismatch

Source location: tests/decl_safety.rs:84

#[test]
fn safe_trait_negative_impl_mismatch() {
    FormalityTest::new(crates![crate baguette {
        #![feature(negative_impls)]
        trait Foo {}
        unsafe impl !Foo for u32 {}
    }])
    .rustc_err(expect_test::expect![[r#"
        error[E0198]: negative impls cannot be unsafe
         --> lib.rs
          |
        5 | unsafe impl !Foo for u32 {}
          | ------      -^^^
          | |           |
          | |           negative because of this
          | unsafe because of this

        For more information about this error, try `rustc --explain E0198`.
        error: could not compile `baguette` (lib) due to 1 previous error
    "#]])
    .err(expect_test::expect![[r#"
        the rule "check_neg_trait_impl" at (impls.rs) failed because
          negative impls cannot be unsafe"#]])
}

Rules proved (0)

This test records no positive coverage.

Premises failed (4)

The last column links to the premise’s page when the judgment view counts this failure against that premise. It does not when the premise is read as infallible, or when the failure was blamed inside a multi-line premise that carries no record on its own first line.

Proof trees