What the..

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TomToad

It's how things are being optimized by the compiler. On the last Print statement, the compiler sees that you are converting a literal string to an int, back to a string, then printing. So it optimizes by removing all of the conversion code and printing 23 directly (which is what the value of --23 actually is.). Since you store "--23" in a string variable for the other prints, the compiler can't optimize it and so the conversion is done during run time, and it can't come to grips with the double "--", so the conversion returns 0. You can see this by looking at the .s file the compiler generates.
Now I wonder why the compiler is able to convert "--23" properly, but the runtime modules can't.