Unused variable warning in XCode 6

Question

I see this warning while compiling within the Mixpanel framework used in my project.

It was not showing when I compiled some moment back. Is it a bug in XCode 6? How the variable k is unused here?

Answer 1

You must be compiling with the constant NS_BLOCK_ASSERTIONS set, so those NSAssert() statements are disabled.

From the documentation :

Assertions are disabled if the preprocessor macro NS_BLOCK_ASSERTIONS is defined.