本文探讨了InparseStmt中存在的if-else分支匹配问题及其潜在风险，并提出了一种利用运行时系统进行类型检查的改进方案，即通过多态性来避免运行时错误。
In parseStmt, there is a big if-else branching part to match the stmt to the right alternative. This is very error-prone, becuase we rely on the programmer to set the alternative number to identify the subtype. If a wrong alt. num is set, boom, type error during runtime. A better solution is to have the run time system to take care of type-checking, instead of checking type number during runtime by the programmer, so use polymorphism.
CP5: Using polymorphism
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