Remove predicate functions from Expression #249
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The package is very much oriented towards using pattern matching, and I feel that these functions go against that idea. We should either do none, or do a lot more (for every node type?).
I'mp pretty sure all these functions (and more helper functions in the package) were meant to help with a very specific use-case in Elm Analyse. In this case, it was https://github.com/stil4m/elm-analyse/blob/701b8b4013a4f057b9382d368e42adc6fe08e14e/src/Analyser/Checks/UnnecessaryParens.elm#L196
I think these helper functions are likely better reimplemented in the usage code.