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A depth-first visitor for expressions.
- Iterate this dsymbol or members of this scoped dsymbol, then call
fpwith the found symbol and
the dsymbol or parent of members to call fp on FP
function pointer to process the iterated symbol. If it returns nonzero, the iteration will be aborted. Params
any parameters passed to fp.Returns:nonzero if the iteration is aborted by the return value of fp, or 0 if it's completed.