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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pycore_optimizer_types.h‎ needs to include stdbool.h","articleBody":"# Bug report\n\n### Bug description:\n\naeb3403 moved some code using the `bool` type from `pycore_optimizer.h‎`, which includes `stdbool.h`, to `pycore_optimizer_types.h‎`, which does not. As a result, depending on the internal details of your libc headers, you can now get a compile error like:\n```\nIn file included from Parser/pegen_errors.c:5:\nIn file included from ./Include/internal/pycore_runtime.h:11:\nIn file included from ./Include/internal/pycore_runtime_structs.h:10:\nIn file included from ./Include/internal/pycore_interp_structs.h:15:\nIn file included from ./Include/internal/pycore_tstate.h:15:\n./Include/internal/pycore_optimizer_types.h:70:5: error: unknown type name 'bool'\n    bool invert;\n    ^\n```\n\n### CPython versions tested on:\n\n3.15\n\n### Operating systems tested on:\n\nmacOS\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-143947\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/jmroot","@type":"Person","name":"jmroot"},"datePublished":"2026-01-16T22:54:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/143943/cpython/issues/143943"}