[E0308] suggests u128::from of a Duration

Code

use std::time::Duration;

fn f(x: Duration, y: Duration, z: u128) {
    x.saturating_sub(y) / z;
}

Current output

error[E0308]: mismatched types
 --> src/lib.rs:4:27
  |
4 |     x.saturating_sub(y) / z;
  |                           ^ expected `u32`, found `u128`
  |
help: you can convert `x.saturating_sub(y)` from `u32` to `u128`, matching the type of `z`
  |
4 |     u128::from(x.saturating_sub(y)) / z;
  |     +++++++++++                   +

Desired output

Rationale and extra context

1. The "expected u32" is suspicous. Is this from the fallback of integer types?
2. The suggested fix results in another error, so that should be removed.

4 |     u128::from(x.saturating_sub(y)) / z;
  |     ^^^^ the trait `From<Duration>` is not implemented for `u128`

It seems like the suggestions only sees the saturating_sub without considering the types of x and y or something like that.

Other cases

Rust Version

rustc 1.96.0 (ac68faa20 2026-05-25)
binary: rustc
commit-hash: ac68faa20c58cbccd01ee7208bf3b6e93a7d7f96
commit-date: 2026-05-25
host: x86_64-unknown-linux-gnu
release: 1.96.0
LLVM version: 22.1.2

Anything else?

Also happens with 1.94.0 and nightly 2026-06-20.