Varargs function breaks type patterns

/**********************************************************************
 *
 * SAC bug report: varargs.sacbugreport
 *
 **********************************************************************
 *
 * Automatically generated on wo 18 feb 2026 11:14:36 CET
 *
 * using sac2c 2.1.0-PuurGeluk-211-gdb91
 * built 2026-02-18T11:02:40.
 * by user qc on host pop-os.
 *
 * The compiler was called by
 * /home/qc/sac2c/src/cmake-build-debug/sac2c_d varargs.sac -check p
 *
 * The compiler crashed in
 *  phase: pretp (Preprocessing type patterns)
 *  sub phase: rtpe (Turning type patterns of externals into code)
 *
 * What follows is the contents of varargs.sac.
 *
 **********************************************************************/

external int dots(int[*] unused, ...);

int main() {
    b = dots([1], [2]);
    return 0;
}

I got the following error message.

**  1: Loading SAC program ...
**  2: Preprocessing type patterns ...
/home/qc/sac2c/src/libsac2c/typepattern/type_pattern_resolve.c:1386:17: runtime error: member access within null pointer of type 'struct node'

I think the problem is that the external function has no pragma at all.