One practical use of "fix" is emulating Python-like decorators in Haskell: http://web.cecs.pdx.edu/~ntc2/haskell-decorator-paper.pdf http://web.cecs.pdx.edu/~nt

One practical use of "fix" is emulating Python-like decorators in Haskell: http://web.cecs.pdx.edu/~ntc2/haskell-decorator-paper.pdf http://web.cecs.pdx.edu/~ntc2/haskell-decorator-paper.pdf Fixed points are also an important part of the technique described in the paper "Abstracting Definitional Interpreters" https://arxiv.org/pdf/1707.04755.pdf https://arxiv.org/pdf/1707.04755.pdf