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funset_nil文件中的声明libats/ML/SATS/funset.sats如下:
funset_nil
libats/ML/SATS/funset.sats
fun{} funset_nil{a:t0p} ():<> set(a)
是什么:<>意思?
:<>
这表明该函数是纯的。不会发生任何影响。请参阅https://github.com/githwxi/ATS-Postiats/wiki/effects。