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Passing an explicit boolean value (`on`, `off` etc.) appears to work, but actually puts the compiler into an unintended state where unstable _options_ are still forbidden, but unstable values of _some_ stable options are allowed.
36 lines
787 B
Rust
36 lines
787 B
Rust
//@ revisions: ascii unicode
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//@[ascii] compile-flags: --diagnostic-width=40
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//@[unicode] compile-flags: -Zunstable-options --error-format=human-unicode --diagnostic-width=40
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//@ normalize-stderr-test: "long-type-\d+" -> "long-type-hash"
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trait Future {
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type Error;
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}
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impl<T, E> Future for Result<T, E> {
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type Error = E;
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}
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impl<T> Future for Option<T> {
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type Error = ();
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}
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struct Foo;
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fn foo() -> Box<dyn Future<Error=Foo>> {
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Box::new( //[ascii]~ ERROR E0271
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Ok::<_, ()>(
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Err::<(), _>(
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Ok::<_, ()>(
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Err::<(), _>(
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Ok::<_, ()>(
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Err::<(), _>(Some(5))
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)
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)
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)
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)
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)
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)
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}
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fn main() {
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}
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