Rename `MapInPlace` as `FlatMapInPlace`. After removing the `map_in_place` method, which isn't much use because modifying every element in a collection such as a `Vec` can be done trivially with iteration. r? ``@lqd``
needs_process_obligation
source_span
rustc_data_structures
ref
MapInPlace
FlatMapInPlace
if $c:expr { Some($r:expr) } else { None }
$c.then(|| $r)
uninlined_format_args