C: cast expression as call argument fails to parse

• Type: bug (C frontend / parser) — Track C
• Status: DONE (already fixed since v152; regression test added) — 2026-07-04

Resolution (2026-07-04)

No longer reproduces — fixed incidentally by C-frontend work landed since v152. Verified on current master AND pinned v171: printf("t=%d\n", (int)t), g((int)t), and printf("a=%d b=%d c=%ld\n", (int)x, (int)d(), (long)x) all parse and produce correct values (t=5, a=7 b=3 c=7) — both the vararg and plain-call forms the ticket flagged. Added regression test test/ccast_call_arg.c (cast as vararg + plain call arg) wired into make test (expects v=20 s=22) so it stays fixed.

• Opened: 2026-07-02, found during bug-max-proc-params-32-selfmiscompile (verified identical on pinned v152 — pre-existing).

Symptom

printf("t=%d\n", (int)t); → error: expected C expression. A cast as a direct call argument does not parse; hoisting to a local (int ti = (int)t;) works, and casts elsewhere (initializers, returns: return (int)sum32(...)) work.

May be vararg-call-specific — check both vararg and plain calls.