Iterate this dsymbol or members of this scoped dsymbol, then call fp with the found symbol and params.
_apply.d Documentation: https://dlang.org/phobos/dmd_apply.html Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/apply.d
Copyright (C) 1999-2021 by The D Language Foundation, All Rights Reserved
A depth-first visitor for expressions.