Function rustc_hir_analysis::check::region::record_rvalue_scope_if_borrow_expr

fn record_rvalue_scope_if_borrow_expr<'tcx>(
    visitor: &mut RegionResolutionVisitor<'tcx>,
    expr: &Expr<'_>,
    blk_id: Option<Scope>
)

If expr matches the E& grammar, then records an extended rvalue scope as appropriate:

    E& = & ET
       | StructName { ..., f: E&, ... }
       | [ ..., E&, ... ]
       | ( ..., E&, ... )
       | {...; E&}
       | box E&
       | E& as ...
       | ( E& )