`let else` not suggested for refutable let patterns.

Code

fn main() {
    let foo = 0;
    let 1 = foo;
}

Current output

error[E0005]: refutable pattern in local binding
 --> src/main.rs:3:9
  |
3 |     let 1 = foo;
  |         ^ patterns `i32::MIN..=0_i32` and `2_i32..=i32::MAX` not covered
  |
  = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
  = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
  = note: the matched value is of type `i32`
help: you might want to use `if let` to ignore the variants that aren't matched
  |
3 |     if let 1 = foo { todo!() };
  |     ++             +++++++++++
help: alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits
  |
3 |     let _1 = foo;
  |         +

For more information about this error, try `rustc --explain E0005`.
error: could not compile `playground` (bin "playground") due to 1 previous error

Desired output

help: you might want to use `let else`
  |
3 |     let 1 = foo else { todo!() };
  |                 ++++++++++++++++

Rationale and extra context

Should also suggest the use of let else

Other cases

No response

Rust Version

rustc 1.78.0-nightly (3246e7951 2024-02-19)
binary: rustc
commit-hash: 3246e79513cb89ddbfc0f21cb5a877e5b321dcc5
commit-date: 2024-02-19
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0

Anything else?

No response

Start with the reproducer in src/main.rs and inspect the E0005 diagnostic described in the issue, including rustc --explain E0005. Trace where refutable local-binding suggestions are generated and determine how the let-else suggestion should be emitted. Done means the example reports a let else suggestion with the shown replacement without losing existing diagnostics.