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Fix grammar #2639

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Jul 26, 2017
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Fix grammar #2639

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2 changes: 1 addition & 1 deletion docs/control-structures.rst
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Expand Up @@ -383,7 +383,7 @@ state in the current call (and all its sub-calls) and also flag an error to the
The convenience functions ``assert`` and ``require`` can be used to check for conditions and throw an exception
if the condition is not met. The ``assert`` function should only be used to test for internal errors, and to check invariants.
The ``require`` function should be used to ensure valid conditions, such as inputs, or contract state variables are met, or to validate return values from calls to external contracts.
If used properly, analysis tools can evaluate your contract to identify the conditions and function calls which will reach a failing ``assert``. Properly functioning code should never it is reach a failing assert statement, if this happens there is a bug in your contract which you should fix.
If used properly, analysis tools can evaluate your contract to identify the conditions and function calls which will reach a failing ``assert``. Properly functioning code should never reach a failing assert statement; if this happens there is a bug in your contract which you should fix.

There are two other ways to trigger exceptions: The ``revert`` function can be used to flag an error and
revert the current call. In the future it might be possible to also include details about the error
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