Credence.Pattern.PreferStringSliceForTrimLastChar (credence v0.8.0)

Detects the verbose case String.graphemes(str) idiom for removing the last character from a string, and rewrites it to the idiomatic String.slice(str, 0..-2//1).

Bad

case String.graphemes(str) do
  [] -> ""
  [_last] -> ""
  [_head | _tail] -> String.slice(str, 0, String.length(str) - 1)
end

Good

String.slice(str, 0..-2//1)