Dont swallow bad input while parsing spaces #6054
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Fix #5939
The problem in this input is not the presence of Unicode characters. It is the presence of a tab character (the larger space in the comment). Remove only that character and roc is happy to run the test without any trouble.
Anyway, the tab error is rightly identified by the parser but was swallowed and converted to
EExpr::DefMissingFinalExpr, leading to that confusing error. Keeping it makes roc print the right error.