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1 error[E0277]: expected a `FnMut<(char,)>` closure, found `u8`
2   --> $DIR/assoc-fn-bound-root-obligation.rs:2:20
3    |
4 LL |     s.strip_suffix(b'\n').unwrap_or(s)
5    |       ------------ ^^^^^ expected an `FnMut<(char,)>` closure, found `u8`
6    |       |
7    |       required by a bound introduced by this call
8    |
9    = help: the trait `FnMut<(char,)>` is not implemented for `u8`
10    = help: the following other types implement trait `Pattern<'a>`:
11              &'b String
12              &'b [char; N]
13              &'b [char]
14              &'b str
15              &'c &'b str
16              [char; N]
17              char
18              pattern::MultiCharEqPattern<C>
19    = note: required because of the requirements on the impl of `Pattern<'_>` for `u8`
20
21 error: aborting due to previous error
22
23 For more information about this error, try `rustc --explain E0277`.