error: methods called `to_*` usually take self by reference
  --> $DIR/wrong_self_conventions_mut.rs:15:24
   |
LL |         pub fn to_many(&mut self) -> Option<&mut [T]> {
   |                        ^^^^^^^^^
   |
   = note: `-D clippy::wrong-self-convention` implied by `-D warnings`
   = help: consider choosing a less ambiguous name

error: methods called like this: (`to_*` and `*_mut`) usually take self by mutable reference
  --> $DIR/wrong_self_conventions_mut.rs:23:28
   |
LL |         pub fn to_many_mut(&self) -> Option<&[T]> {
   |                            ^^^^^
   |
   = help: consider choosing a less ambiguous name

error: aborting due to 2 previous errors