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Update reference.md

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Manish Goregaokar 2015-11-24 11:56:27 +05:30
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@ -649,8 +649,8 @@ apply to the crate as a whole.
```
A crate that contains a `main` function can be compiled to an executable. If a
`main` function is present, its return type must be [`unit`](#tuple-types)
and it must take no arguments.
`main` function is present, its return type must be `()`
("[unit](#tuple-types)") and it must take no arguments.
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