Four cases in extraction.test.ts: a Rust union carrying an
`impl Trait for` edge and owning the impl's method; a named C union
alongside a forward declaration that must NOT mint a node; a
`typedef union` taking the typedef name with no `<anonymous>` twin; a
C++ union with a member function.
Verified they fail without the fix on BOTH extraction paths — the wasm
walker via CODEGRAPH_KERNEL=0 and the kernel with a staged build.
torture.c / torture.rs gain the same shapes. The parity gate compares
the two walkers rather than a snapshot, so the fixtures do not detect
the bug on their own — they pin that the fix stays SYMMETRIC. The
regression tests above are what pin that it is present.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ctype_lab
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