Type 'String.Index' does not conform protocol 'IntegerLiteralConvertible'

Question

With Beta 3 all worked fine, now I get a strange error, and I have no clue how to fix it. Tried all the solutions for similiar problems.

Here is my code:

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Answer 1

For Swift 2.0

Using the example above:

curPart.substringToIndex(curPart.startIndex.advancedBy(1))