func newCodeBlock(localvars *varNamePool, blabel int, parent *codeBlock, pos ast.PositionHolder) *codeBlock {
bl := &codeBlock{localvars, blabel, parent, false, 0, 0}
if pos != nil {
bl.LineStart = pos.Line()
bl.LastLine = pos.LastLine()
}
return bl
}
func sline(pos ast.PositionHolder) int {
return pos.Line()
}