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Lexing from \u{ until the closing } works for valid documents, but if
you forget the closing }, it will go also past the closing " and create
very puzzling errors. So limit what we parse to hex digits then, and
report the errors slightly differently.
14 lines
335 B
Text
14 lines
335 B
Text
f"This f-string is not closed.{0 0}"
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# output:
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stdin:1:34
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╷
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1 │ f"This f-string is not closed.{0 0}"
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╵ ^
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Error: Expected '}' here to close format string hole.
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stdin:1:31
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╷
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1 │ f"This f-string is not closed.{0 0}"
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╵ ^
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Note: Unmatched '{' opened here.
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