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Struct dmd.dfa.fast.structure.DFAScope
Represents a specific region of code execution (a scope).
struct DFAScope;
As the DFA walks through the code, it pushes and pops scopes.
Each scope holds a table (buckets) of the current state of variables
within that block.
When the analysis branches (e.g., inside an if), a new child scope is
created to track the state changes specific to that branch.
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