dup() public

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static VALUE
proc_dup(VALUE self)
    VALUE procval = rb_proc_alloc(rb_cProc);
    rb_proc_t *src, *dst;
    GetProcPtr(self, src);
    GetProcPtr(procval, dst);

    dst->block = src->block;
    dst->block.proc = procval;
    dst->envval = src->envval;
    dst->safe_level = src->safe_level;
    dst->is_lambda = src->is_lambda;

    return procval;
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