rustc confuses missing types with missing type parameters

[Wilfred]

Code

pub fn do_stuff() -> Option<ForgotToImport> {
    None
}

Current output

error[E0412]: cannot find type `ForgotToImport` in this scope
 --> src/lib.rs:1:29
  |
1 | pub fn do_stuff() -> Option<ForgotToImport> {
  |                             ^^^^^^^^^^^^^^ not found in this scope
  |
help: you might be missing a type parameter
  |
1 | pub fn do_stuff<ForgotToImport>() -> Option<ForgotToImport> {
  |                ++++++++++++++++

Desired output

error[E0412]: cannot find type `ForgotToImport` in this scope
 --> src/lib.rs:1:29
  |
1 | pub fn do_stuff() -> Option<ForgotToImport> {
  |                             ^^^^^^^^^^^^^^ not found in this scope

Rationale and extra context

Type parameters are rarely this long, so rustc's guess seems like a poor fit. Could rustc treat longer names as unlikely to be type parameters?

Another option would be to skip this suggestion if the type name is CamelCase.

Other cases

Rust Version

$ rustc --version --verbose
rustc 1.86.0 (05f9846f8 2025-03-31)
binary: rustc
commit-hash: 05f9846f893b09a1be1fc8560e33fc3c815cfecb
commit-date: 2025-03-31
host: x86_64-unknown-linux-gnu
release: 1.86.0
LLVM version: 19.1.7

Anything else?

No response

[Kivooeo]

Hi, would love to take this one, almost finished writing implementation, and will add tests and so on tomorrow and publish it in PR