Write a tool to check for modularity violations in Tor's codebase
It's easy to find out which C files look at symbols from which other C files. If we combine that with the ability to know which C files belong to which modules, and which functions should move to other C files, we'll be in good shape for a low-impact redividing of our source code into well-considered modules, to further simplify our modulewise callgraph.
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