Correctness fixes #243
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Correctness fixes #243
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hashmap_node_new() allocates both the node and key via arena_alloc(HASHMAP_ARENA). Calling free(node) when key allocation fails is incorrect because the arena owns lifetime. Remove the invalid free to avoid mixing allocators.
This commit prevents token_str overflow by checking bounds when building preprocessor directives, identifiers, and numeric literals.
This prevents overflow during lexing and extends robust string-escape cases.
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