variable does not need to be mutable
.suggestion = remove this `mut`
-borrowck_const_not_used_in_type_alias =
- const parameter `{$ct}` is part of concrete type but not used in parameter list for the `impl Trait` type alias
-
borrowck_var_cannot_escape_closure =
captured variable cannot escape `FnMut` closure body
.note = `FnMut` closures only have access to their captured variables while they are executing...