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Update index.md (#35035) 

Grammar, one word removed ("ever"), to reflect more typical phrasing.
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Mike Bottom 2019-02-07 07:16:04 -08:00 committed by Christopher McCormack
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guide/english/cplusplus/casting/index.md
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@ -14,7 +14,7 @@ Static cast is used for implicit conversions between primitives and type-overloa
### const_cast
Const cast can be used to cast away const-ness. This is useful when there is a desire to mutate a constant value. This should be used sparingly, instead, one should consider making parameters/functions non-const in cases where a const-cast is used.
Const cast can also result in undefined behaviour. The only application of const cast should ever be to remove const-ness from a value that was passed to a function and marked const. If the value is truly const, that is, it is marked const at compile time and assigned a value, const cast and mutation of the variable will result in undefined behaviour.
Const cast can also result in undefined behaviour. The only application of const cast should be to remove const-ness from a value that was passed to a function and marked const. If the value is truly const, that is, it is marked const at compile time and assigned a value, const cast and mutation of the variable will result in undefined behaviour.
```
const int y = 10; // y is set to 10.