.source_map()
.span_take_while(span, |c| c.is_whitespace() || *c == '&');
if points_at_arg && mutability.is_not() && refs_number > 0 {
+ // If we have a call like foo(&mut buf), then don't suggest foo(&mut mut buf)
+ if snippet
+ .trim_start_matches(|c: char| c.is_whitespace() || c == '&')
+ .starts_with("mut")
+ {
+ return;
+ }
err.span_suggestion_verbose(
sp,
"consider changing this borrow's mutability",
--- /dev/null
+fn main() {
+ let mut buf = [0u8; 50];
+ let mut bref = buf.as_slice();
+ foo(&mut bref);
+ //~^ ERROR 4:9: 4:18: the trait bound `&[u8]: std::io::Write` is not satisfied [E0277]
+}
+
+fn foo(_: &mut impl std::io::Write) {}
--- /dev/null
+error[E0277]: the trait bound `&[u8]: std::io::Write` is not satisfied
+ --> $DIR/issue-105645.rs:4:9
+ |
+LL | foo(&mut bref);
+ | --- ^^^^^^^^^ the trait `std::io::Write` is not implemented for `&[u8]`
+ | |
+ | required by a bound introduced by this call
+ |
+ = help: the trait `std::io::Write` is implemented for `&mut [u8]`
+note: required by a bound in `foo`
+ --> $DIR/issue-105645.rs:8:21
+ |
+LL | fn foo(_: &mut impl std::io::Write) {}
+ | ^^^^^^^^^^^^^^ required by this bound in `foo`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.