Minor refactor of better for desugar #23448
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Move the complex guards into the body of the case and use an
ifconditional to handleis better forsor legacy.The list of enumerators is split into a prefix of aliases and suffix of remaining. The guards made this obscure. (Probably the prefix of aliases is not long, so taking the
spanis cheap enough.)Make the duplicated code in the last case a more exact copy. (But don't bother to DRY it out.)