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As discussed in #173, this PR implements the C++20 modules grammar after the last contributor time restraints. It Closes #174.
Parser states
before:
after:
Implementation
The most complex rules in the grammar are:
Declarations, in turn, can be any one of those discussed in https://en.cppreference.com/w/cpp/language/declarations. Said that, due to the inerent complexity of c++20 modules, I think that the state count can't go much lower than that. I'm open to suggestions tho.