Collect occurrences of {} for mismatched braces diagnostic #63904
Description
Many editors helpfully auto close delimiters when writing them down. It is not uncommon for this to cause the following to occur:
fn main() {}
let _ = ();
}
It'd be a good idea for the parser or lexer to keep track of these empty blocks to provide an error closer to
error: unexpected close delimiter: `}`
--> src/main.rs:3:1
|
1 | fn main() {}
| -- this block is empty, you might have not meant to close it
2 | let _ = ();
3 | }
| ^ unexpected close delimiter