| Return other if res is Ok , or res .
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| Returns whether res strictly equals value , or false if it is an
Err .
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| Returns whether res strictly equals value , or false if it is an
Ok .
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| Converts res into a Some if it is an Err .
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| Calls f and returns the result as an Ok , or returns an
Err if it throws.
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| Calls f with res , and returns the original res .
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| Calls f with res , and returns the original res .
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| Returns whether res is an Err .
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| Returns whether res is an Ok .
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| Calls f with res , and returns the result.
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| Calls f with res , and returns the result.
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| Converts res into a Some if it is an Ok .
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| Return res if it is an Ok , or other .
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| Returns res if it is an Ok , or throws.
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| Returns res if it is an Ok , or returns default_ .
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