Function rustc_typeck::check::upvar::restrict_capture_precision

fn restrict_capture_precision<'tcx>(
    capture_clause: CaptureBy, 
    place: Place<'tcx>
) -> Place<'tcx>

Truncate projections so that following rules are obeyed by the captured place:

• No projections are applied to raw pointers, since these require unsafe blocks. We capture them completely.
• No Index projections are captured, since arrays are captured completely.
• Deref of a box isn’t captured in move clousres.