Suggested replacement for `redundant_closure_for_method_calls` leaves out generic type parameter, leading to error

[ilyvion]

Summary

Title summarizes sufficiently IMO.

Reproducer

I tried this code:

#[warn(clippy::redundant_closure_for_method_calls)]
fn main() {
    let x = Some("42");
    let y = x.map(|x| x.parse::<i16>());
    println!("{y:?}");
}

I expected to see this happen:

4 |     let y = x.map(|x| x.parse::<i16>());
  |                   ^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `str::parse::<i16>`

Instead, this happened:

warning: redundant closure
4 |     let y = x.map(|x| x.parse::<i16>());
  |                   ^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `str::parse`

If you follow this suggestion, you get

error[E0283]: type annotations needed
    --> src/main.rs:4:19
     |
4    |     let y = x.map(str::parse);
     |                   ^^^^^^^^^^ cannot infer type of the type parameter `F` declared on the method `parse`
     |
     = note: cannot satisfy `_: FromStr`

Version

rustc 1.86.0-nightly (bf1b174e7 2025-01-28)
binary: rustc
commit-hash: bf1b174e7d0922fc549071b751ab96fc9ee9f6fe
commit-date: 2025-01-28
host: x86_64-pc-windows-msvc
release: 1.86.0-nightly
LLVM version: 19.1.7

Additional Labels

@rustbot label +I-suggestion-causes-error