`redundant_as_str` misses chained method calls

Summary

The lint currently does not trigger for .as_str().len() even though the .as_str() call is unnecessary.

Reproducer: https://rust.godbolt.org/z/5s563YbP3

Lint Name

redundant_as_str

Reproducer

I tried this code:

fn issue16979(s: String) -> usize {
    s.as_str().len()
}

I expected to see this happen:

warning: this `as_str` is redundant and can be removed as the method immediately following exists on `String` too
 --> <source>:5:7
  |
5 |     s.as_str().len()
  |       ^^^^^^^^^^^^^^^^^ help: try: `len`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_as_str

Or something similar indicating that the .as_str() call can be removed.

Instead, this happened:

No lint ouput

Version

clippy 0.1.97 (fb0a5a5a9c 2026-05-08)