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kotlinlang

deinspanjer: it looks like a problem with case insensitive file system.
If you have a file Foo.class and then open a file foo.class for writing, it will write to the existing Foo.class

deinspanjer: this is probably what the compiler did in your case. Same happens on Windows with case insensitive FS

‘k, I’m just not used to that being any sort of problem on Mac so it caught me unawares

If the class loader were to open that file you would not even have a problem because of that exact case insensitivity. But loading the class from a jar is case sensitive - bang