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@ -196,7 +196,7 @@ class Ref(
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raise PatternError('as_pattern() must be given a pattern or library.')
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raise PatternError('as_pattern() must be given a pattern or library.')
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if pattern is None and self.target is None:
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if pattern is None and self.target is None:
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return None
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return None
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if self.target not in library:
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if library is not None and self.target not in library:
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raise PatternError(f'get_bounds() called on dangling reference to "{self.target}"')
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raise PatternError(f'get_bounds() called on dangling reference to "{self.target}"')
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return self.as_pattern(pattern=pattern, library=library).get_bounds()
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return self.as_pattern(pattern=pattern, library=library).get_bounds()
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