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In the setup phase of the centralised latin.c solver, we start by going over the input grid containing already-placed clue numbers, and calling latin_solver_place to enter each on into the solver's data structure. This has the side effect of ruling out each number from the rest of the row and column, and _also_ checking by assertion that the number being placed is not ruled out. Those are a bad combination, because it means that if you give an obviously inconsistent input grid to latin_solver_alloc (e.g. with two identical numbers in a row already), it will fail an assertion. In that situation, you want the solver run as a whole to return diff_impossible so that the error is reported cleanly. This assertion failure could be provoked by giving either Towers or Group a manually-constructed game description inconsistent in that way, and hitting Solve. Worse, it could be provoked during live play in Unequal, by filling in a number clashing with a clue and then pressing 'h' to get hints.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.