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1d56e3a6d9
Support interpolated block for `try` and `async` I'm putting this up for T-lang discussion, to decide whether or not they feel like this should be supported. This was raised in #112952, which surprised me. There doesn't seem to be a *technical* reason why we don't support this. ### Precedent: This is supported: ```rust macro_rules! always { ($block:block) => { if true $block } } fn main() { always!({}); } ``` ### Counterpoint: However, for context, this is *not* supported: ```rust macro_rules! unsafe_block { ($block:block) => { unsafe $block } } fn main() { unsafe_block!({}); } ``` If this support for `async` and `try` with interpolated blocks is *not* desirable, then I can convert them to instead the same diagnostic as `unsafe $block` and make this situation a lot less ambiguous. ---- I'll try to write up more before T-lang triage on Tuesday. I couldn't find anything other than #69760 for why something like `unsafe $block` is not supported, and even that PR doesn't have much information. Fixes #112952 |
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