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This adds a new filtering option to be used along with the -header-include-format=json option. The existing "only-direct-system" filtering option is missing some things: - It does not show module imports. - It does not show includes of non-system headers. This new "direct-per-file" filtering has a separate entry in the JSON output for each non-system source file, showing the direct includes and imports from that file. You can use this to see uses of non-system headers, and also find the paths through non-system headers that lead up to module imports and system headers. Modules are identified here by their modulemap files.