Crash from jbreak when only 1 debug frame on stack

Author: HenryHRich

jsrc/cx.c

@@ -76,7 +76,8 @@
 // sure that all assignments-in-place have had the usercount fully restored
 #define parseline(z,popstmt,asgstmt) {tcesx=CWTCESX2(cwsent,ic); if((UI)jt->tnextpushp!=(UI)old){popstmt} S attnval=__atomic_load_n((S*)JT(jt,adbreakr),__ATOMIC_ACQUIRE); A *queue=&cwsent[(tcesx>>32)&TCESXSXMSK]; I m=(tcesx-(tcesx>>32))&TCESXSXMSK; \
  SETTRACK \
- if(likely(!(attnval+(NPGpysfmtdl&128+16))))z=parsea(queue,m);else {if(jt->sitop)jt->sitop->dclnk->dcix=~ic; z=parsex(queue,m,CWSOURCE(cwsent,CNSTOREDCW,ic),(NPGpysfmtdl&128+16)?jt->sitop->dclnk:0); if(!(jt->uflags.trace&TRACEDB))NPGpysfmtdl&=~2;} \
+ if(likely(!(attnval+(NPGpysfmtdl&128+16))))z=parsea(queue,m); \
+ else {if(jt->sitop&&jt->sitop->dclnk&&jt->sitop->dclnk->dctype==DCCALL)jt->sitop->dclnk->dcix=~ic; z=parsex(queue,m,CWSOURCE(cwsent,CNSTOREDCW,ic),(NPGpysfmtdl&128+16)?jt->sitop->dclnk:0); if(!(jt->uflags.trace&TRACEDB))NPGpysfmtdl&=~2;} \
  {asgstmt} if(likely(z!=0)){I zasgn=PARSERASGN(z); z=PARSERVALUE(z); if(unlikely(!((AT(z)|zasgn)&NOUN))){if(!(NPGpysfmtdl&8)||(tcesx&TCESXCECANT)) \
    if(jtdeprecmsg(jt,~7,"(007) noun result was required\n")==0)NOUNERR(z,ic,0); \
  }} /* puns that ASGN flag is a NOUN type.  Err if can't be result, or if this is not a modifier */ \