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Now midend.c directly tests the returned pointer for equality to this value, instead of checking whether it's the empty string. A minor effect of this is that games may now return a dynamically allocated empty string from interpret_move() and treat it as just another legal move description. But I don't expect anyone to be perverse enough to actually do that! The main purpose is that it avoids returning a string literal from a function whose return type is a pointer to _non-const_ char, i.e. we are now one step closer to being able to make this code base clean under -Wwrite-strings.
This subdirectory contains puzzle implementations which are half-written, fundamentally flawed, or in other ways unready to be shipped as part of the polished Puzzles collection. Those puzzles which have .R files can be built as part of the Puzzles collection by symlinking their source files into the parent directory and re-running mkfiles.pl. Anything without a .R file isn't even finished enough to do that, and you should read the source file itself to find out the status.