Add a never type option to make diverging blocks ()
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Previous: ```rust #![rustc_never_type_mode = "fallback_to_unit|..."] ``` New: ```rust #![rustc_never_type_options(fallback = "unit|...")] ``` This allows adding other options for other never-related experiments.
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```rust
#![allow(internal_features)]
#![feature(never_type, rustc_attrs)]
#![rustc_never_type_options(diverging_block_default = "unit")]
fn main() {
let _: u8 = { //~ error: expected `u8`, found `()`
return;
};
}
```
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@bors r+ rollup |
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…iaskrgr Rollup of 11 pull requests Successful merges: - rust-lang#121881 (std::net: adding acceptfilter feature for netbsd/freebsd.) - rust-lang#122817 (Doc Guarantee: BTree(Set|Map): `IntoIter` Iterate in Sorted by key Order) - rust-lang#122826 (Add tests for shortcomings of associated type bounds) - rust-lang#122829 (Implement `FusedIterator` for `gen` block) - rust-lang#122831 (make failure logs less verbose) - rust-lang#122837 (add test for rust-lang#122549) - rust-lang#122838 (Avoid noop rewrite of issues.txt) - rust-lang#122841 (add 2 more tests for issues fixed by rust-lang#122749) - rust-lang#122843 (Add a never type option to make diverging blocks `()`) - rust-lang#122844 (add test for ice "cannot relate region: LUB(ReErased, ReError)") - rust-lang#122845 (Clippy subtree update) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#122843 - WaffleLapkin:semicolon-vs-the-never, r=compiler-errors Add a never type option to make diverging blocks `()` More experiments for ~~the blood god~~ T-lang! Usage example: ```rust #![allow(internal_features)] #![feature(never_type, rustc_attrs)] #![rustc_never_type_options(diverging_block_default = "unit")] fn main() { let _: u8 = { //~ error: expected `u8`, found `()` return; }; } ``` r? compiler-errors I'm not sure how I feel about parsing the attribute every time we create `FnCtxt`. There must be a better way to do this, right?
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…ons, r=compiler-errors Fixup parsing of `rustc_never_type_options` attribute rust-lang#122843 had a copy paste error, which I did not caught when testing. r? `@compiler-errors`
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…ons, r=compiler-errors Fixup parsing of `rustc_never_type_options` attribute rust-lang#122843 had a copy paste error, which I did not caught when testing. r? ``@compiler-errors``
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…ons, r=compiler-errors Fixup parsing of `rustc_never_type_options` attribute rust-lang#122843 had a copy paste error, which I did not caught when testing. r? ```@compiler-errors```
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…s, r=compiler-errors Fixup parsing of `rustc_never_type_options` attribute rust-lang#122843 had a copy paste error, which I did not caught when testing. r? `@compiler-errors`
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More experiments for
the blood godT-lang!Usage example:
r? compiler-errors
I'm not sure how I feel about parsing the attribute every time we create
FnCtxt. There must be a better way to do this, right?