C: calling through an INLINE fn-pointer parameter — "call to undeclared function"

• Type: bug (cparser param declarators). Track C.
• Found: 2026-07-08 game-library ladder, stb_sprintf.h first probe (feature-game-library-candidate-suite); long-known in principle — the crtl qsort comment (lib/crtl/src/stdlib.c) already works around it with a typedef.

Repro

int apply(int (*cb)(int), int x) { return cb(x); }
/* pascal26: error: call to undeclared function: cb */

Typedef'd form works (typedef int (*fn)(int); int apply(fn cb, int x)), so the inline T (*name)(params) PARAM declarator never records its call signature (SymProcSig) the way the typedef path does.

Blocks

• stb_sprintf.h (stbsp__vsprintfcb's callback param, line ~418) — the whole stb single-header family leans on this idiom.
• Any qsort-style API written without a typedef.

Gate

stb probe test/gamelib/stb_sprintf_probe.c compiles+passes; the crtl qsort typedef workaround can be dropped; regression bXXX; c-conformance + corpus green + self-host.

Log

• 2026-07-08 — resolved, commit 0c2a3329.