rust/tests/ui/expr/if/attrs/let-chains-attr.rs

//@ check-pass

#![feature(let_chains)]

#[cfg(FALSE)]
fn foo() {
    #[attr]
    if let Some(_) = Some(true) && let Ok(_) = Ok(1) {
    } else if let Some(false) = Some(true) {
    }
}

fn main() {}
Permit attributes on 'if' expressions Previously, attributes on 'if' expressions (e.g. #[attr] if true {}) were disallowed during parsing. This made it impossible for macros to perform any custom handling of such attributes (e.g. stripping them away), since a compilation error would be emitted before they ever had a chance to run. This PR permits attributes on 'if' expressions ('if-attrs' from here on). Both built-in attributes (e.g. `#[allow]`, `#[cfg]`) are supported. We still do not accept attributes on 'other parts' of an if-else chain. That is, the following code snippet still fails to parse: ```rust if true {} #[attr] else if false {} else #[attr] if false {} #[attr] else {} ``` 2020-02-16 00:04:20 +00:00			`//@ check-pass`

Revert let_chains stabilization This reverts commit 326646074940222d602f3683d0559088690830f4. This is the revert against master, the beta revert was already done in #100538. 2022-08-20 18:40:08 +00:00			`#![feature(let_chains)]`

Permit attributes on 'if' expressions Previously, attributes on 'if' expressions (e.g. #[attr] if true {}) were disallowed during parsing. This made it impossible for macros to perform any custom handling of such attributes (e.g. stripping them away), since a compilation error would be emitted before they ever had a chance to run. This PR permits attributes on 'if' expressions ('if-attrs' from here on). Both built-in attributes (e.g. `#[allow]`, `#[cfg]`) are supported. We still do not accept attributes on 'other parts' of an if-else chain. That is, the following code snippet still fails to parse: ```rust if true {} #[attr] else if false {} else #[attr] if false {} #[attr] else {} ``` 2020-02-16 00:04:20 +00:00			`#[cfg(FALSE)]`
			`fn foo() {`
			`#[attr]`
			`if let Some(_) = Some(true) && let Ok(_) = Ok(1) {`
			`} else if let Some(false) = Some(true) {`
			`}`
			`}`

			`fn main() {}`