Auto merge of #112953 - compiler-errors:interpolated-block-exprs, r=WaffleLapkin

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

0 files changed, 0 insertions, 0 deletions