Extraneous `$` in macro by example matcher produces suggestion for nonsensica, syntactically invalid fix

[LunarLambda]

Code

macro_rules! repro {
    ($($e:$expr),*) => {}
}

(note the extraneous `$` in `$e:$expr`)

Current output

error: missing fragment specifier
 --> src/lib.rs:2:11
  |
2 |     ($($e:$expr),*) => {}
  |           ^
  |
  = note: fragment specifiers must be provided
  = help: valid fragment specifiers are `ident`, `block`, `stmt`, `expr`, `pat`, `ty`, `lifetime`, `literal`, `path`, `meta`, `tt`, `item` and `vis`, along with `expr_2021` and `pat_param` for edition compatibility
help: try adding a specifier here
  |
2 |     ($($e:$:specexpr),*) => {}
  |            +++++

Desired output

Rationale and extra context

Ideally I would like the diagnostic to point out the $ as extraneous and simply suggest its removal. Or at the very least, produce something that is syntactically correct Rust. even if it's not the code the user "meant" to write.

Other cases

Rust Version

play.rust-lang.org, stable (1.96.0)

Anything else?

No response