rustdoc replaces aliases used as trait type parameters

[tspiteri]

use std::os::raw::c_long;

pub struct S(c_long);

impl From<c_long> for S {
    fn from(i: c_long) -> S { S(i) }
}

The documentation for the S trait implementations looks like this:

While the from function itself is documented correctly to take a parameter of type c_long, the From trait has type parameter i64 instead of c_long. I expected it to be impl From<c_long> for S instead.

Meta

rustc +nightly --version:

rustc 1.53.0-nightly (4a20eb6a9 2021-03-28)

[jyn514]

Duplicate of #80557.