C forward enum declaration enum efoo; (GCC extension, common in the wild)

• Type: feature (cparser). Track C.
• Found: 2026-07-06 c-testsuite run.

Failing test

• 00170: enum efoo; before definition, used in prototypes/struct fnptr members before the enum efoo { ... } definition — "unresolved forward: deref_uintptr". Not ISO C but GCC accepts (pedantic warning only); test comment says it happens in real code. (The odd "deref_uintptr" unresolved suggests the enum parse failure derails later function registration too.)

Gate

Drop 00170.c from test/c-conformance/pxx.skip; runner green.

Log

• 2026-07-06 — resolved, commit 6ea9389e.