Feature request: carry comments in the middle of function bodies down to LLBC

[msprotz]

In the following snippet, I would like a way to retrieve the comment in LLBC.

fn foo() -> u32 {
 // Bar
  0
}

Possible thoughts include:

• looking up the text via span information
• using a rustdoc comment in the hope that it gets attached to an AST node
• ...?

Thanks!

[Nadrieril]

Turns out clippy has a lint that detects // SAFETY comments before unsafe blocks. They do span shenanigans to recover the comments. Code is here for inspiration.

[Nadrieril]

I made a decent attempt here: #358, which is made mostly pointless by #233.

[Nadrieril]

Alright, this now works! Comments on each statement are accessible in comments_before.

The heuristic for where to place comments is quite naive however, so please report back if comments end up in surprising places.