Fix already-solved lifetime challenge in anagram #1847
Merged
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This is basically a revert of #1755.
The original "fix" was a reaction to this forum post: https://forum.exercism.org/t/the-function-signature-for-anagrams-in-rust-is-missing-a-lifetime/7677
It seems the exercise instructions, which explicitly mention that this missing lifetime annotation is intentional, went unnoticed.