ResourceT: A necessary evil

Alternative title: “ResourceT considered harmful” Summary: ResourceT is a great tool, used to solve real problems when dealing with constrained resources and runtime exceptions. However, in the wild, it is often overused for situations where its full power isn’t needed. If you want more information on ResourceT, check out its README.md. How do you copy a file in Haskell? Let’s ignore the obvious a

[igrep]

みんなResourceT使いすぎだよbracketパターンで大抵いけるよ、sourceDirectoryみたいに動的にリソースを取得したり開放したりするケース以外は使うなよ、という話。