Unhelpful error message with identifiers named box

[rstk]

The following code, which won't compile because of (edited: #49733) #29641

fn main() {
    let box = Box::new(1);
}

yields an unhelpful error message:

error: expected pattern, found `=`
 --> src/main.rs:2:13
  |
2 |     let box = Box::new(1);
  |             ^ expected pattern

Particularly confusing if your text editor doesn't highlight box! It would be nicer to show some help proposing to rename the variable.

[ChayimFriedman2]

@rustbot claim

[est31]

@rstk FTR you linked to the wrong issue, you should have linked to #29641, as it's a box pattern not a box expression in the case of your snippet.