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Struct dmd.dfa.fast.structure.DFACommon
The central context for a DFA run.
struct DFACommon;
This structure manages the memory allocator, holds references to global variables (like return values), and tracks the current scope being analyzed.
Performance Note:
It uses a custom DFAAllocator (bump-pointer allocator) to avoid the overhead
of the GC or standard malloc for the thousands of tiny nodes created during analysis.
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