Modelsim仿真时不报错，不出波形“# A time value could not be extracted from the current line”

组合逻辑如果以always段书写，但是没有写敏感表“@ （）”如下图所示：
Modelsim仿真时不报错，不出波形“# A time value could not be extracted from the current line” (1)quartus或者modelsim在编译的时候都不会对这个产生错误或者警告。
（2）modelsim仿真时会一直卡在那里，出现“A time value could not be extracted from the current line”，仿真无波形，如下图所示：
Modelsim仿真时不报错，不出波形“# A time value could not be extracted from the current line”

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