rust/compiler/rustc_parse
Matthias Krüger d752721636
Rollup merge of #138435 - eholk:prefix-yield, r=oli-obk
Add support for postfix yield expressions

We've been having a discussion about whether we want postfix yield, or want to stick with prefix yield, or have both. I figured it's easy enough to support both for now and let us play around with them while the feature is still experimental.

This PR treats `yield x` and `x.yield` as semantically equivalent. There was a suggestion to make `yield x` have a `()` type (so it only works in coroutines with `Resume = ()`. I think that'd be worth trying, either in a later PR, or before this one merges, depending on people's opinions.

#43122
2025-03-20 15:36:15 +01:00
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