diff --git a/thirdparty/lemon/lemon.c b/thirdparty/lemon/lemon.c
index 54c8946a0d..fb81292d4d 100644
--- a/thirdparty/lemon/lemon.c
+++ b/thirdparty/lemon/lemon.c
@@ -401,7 +401,7 @@ struct lemon {
   struct symbol *errsym;   /* The error symbol */
   struct symbol *wildcard; /* Token that matches anything */
   char *name;              /* Name of the generated parser */
-  char *arg;               /* Declaration of the 3th argument to parser */
+  char *arg;               /* Declaration of the 3rd argument to parser */
   char *ctx;               /* Declaration of 2nd argument to constructor */
   char *tokentype;         /* Type of terminal symbols in the parser stack */
   char *vartype;           /* The default type of non-terminal symbols */
@@ -917,8 +917,11 @@ void FindStates(struct lemon *lemp)
       lemp->errorcnt++;
       sp = lemp->startRule->lhs;
     }
-  }else{
+  }else if( lemp->startRule ){
     sp = lemp->startRule->lhs;
+  }else{
+    ErrorMsg(lemp->filename,0,"Internal error - no start rule\n");
+    exit(1);
   }
 
   /* Make sure the start symbol doesn't occur on the right-hand side of
@@ -1027,7 +1030,7 @@ PRIVATE void buildshifts(struct lemon *lemp, struct state *stp)
   struct symbol *bsp;  /* Symbol following the dot in configuration "bcfp" */
   struct state *newstp; /* A pointer to a successor state */
 
-  /* Each configuration becomes complete after it contibutes to a successor
+  /* Each configuration becomes complete after it contributes to a successor
   ** state.  Initially, all configurations are incomplete */
   for(cfp=stp->cfp; cfp; cfp=cfp->next) cfp->status = INCOMPLETE;
 
@@ -1083,7 +1086,7 @@ void FindLinks(struct lemon *lemp)
   ** which the link is attached. */
   for(i=0; i<lemp->nstate; i++){
     stp = lemp->sorted[i];
-    for(cfp=stp->cfp; cfp; cfp=cfp->next){
+    for(cfp=stp?stp->cfp:0; cfp; cfp=cfp->next){
       cfp->stp = stp;
     }
   }
@@ -1092,7 +1095,7 @@ void FindLinks(struct lemon *lemp)
   ** links are used in the follow-set computation. */
   for(i=0; i<lemp->nstate; i++){
     stp = lemp->sorted[i];
-    for(cfp=stp->cfp; cfp; cfp=cfp->next){
+    for(cfp=stp?stp->cfp:0; cfp; cfp=cfp->next){
       for(plp=cfp->bplp; plp; plp=plp->next){
         other = plp->cfp;
         Plink_add(&other->fplp,cfp);
@@ -1115,6 +1118,7 @@ void FindFollowSets(struct lemon *lemp)
   int change;
 
   for(i=0; i<lemp->nstate; i++){
+    assert( lemp->sorted[i]!=0 );
     for(cfp=lemp->sorted[i]->cfp; cfp; cfp=cfp->next){
       cfp->status = INCOMPLETE;
     }
@@ -1123,6 +1127,7 @@ void FindFollowSets(struct lemon *lemp)
   do{
     progress = 0;
     for(i=0; i<lemp->nstate; i++){
+      assert( lemp->sorted[i]!=0 );
       for(cfp=lemp->sorted[i]->cfp; cfp; cfp=cfp->next){
         if( cfp->status==COMPLETE ) continue;
         for(plp=cfp->fplp; plp; plp=plp->next){
@@ -1172,7 +1177,14 @@ void FindActions(struct lemon *lemp)
   /* Add the accepting token */
   if( lemp->start ){
     sp = Symbol_find(lemp->start);
-    if( sp==0 ) sp = lemp->startRule->lhs;
+    if( sp==0 ){
+      if( lemp->startRule==0 ){
+        fprintf(stderr, "internal error on source line %d: no start rule\n",
+                __LINE__);
+        exit(1);
+      }
+      sp = lemp->startRule->lhs;
+    }
   }else{
     sp = lemp->startRule->lhs;
   }
@@ -1299,21 +1311,7 @@ static struct config **basisend = 0;     /* End of list of basis configs */
 
 /* Return a pointer to a new configuration */
 PRIVATE struct config *newconfig(void){
-  struct config *newcfg;
-  if( freelist==0 ){
-    int i;
-    int amt = 3;
-    freelist = (struct config *)calloc( amt, sizeof(struct config) );
-    if( freelist==0 ){
-      fprintf(stderr,"Unable to allocate memory for a new configuration.");
-      exit(1);
-    }
-    for(i=0; i<amt-1; i++) freelist[i].next = &freelist[i+1];
-    freelist[amt-1].next = 0;
-  }
-  newcfg = freelist;
-  freelist = freelist->next;
-  return newcfg;
+  return (struct config*)calloc(1, sizeof(struct config));
 }
 
 /* The configuration "old" is no longer used */
@@ -1887,7 +1885,7 @@ static char *merge(
 **
 ** Return Value:
 **   A pointer to the head of a sorted list containing the elements
-**   orginally in list.
+**   originally in list.
 **
 ** Side effects:
 **   The "next" pointers for elements in list are changed.
@@ -1932,8 +1930,12 @@ static FILE *errstream;
 static void errline(int n, int k, FILE *err)
 {
   int spcnt, i;
-  if( g_argv[0] ) fprintf(err,"%s",g_argv[0]);
-  spcnt = lemonStrlen(g_argv[0]) + 1;
+  if( g_argv[0] ){
+    fprintf(err,"%s",g_argv[0]);
+    spcnt = lemonStrlen(g_argv[0]) + 1;
+  }else{
+    spcnt = 0;
+  }
   for(i=1; i<n && g_argv[i]; i++){
     fprintf(err," %s",g_argv[i]);
     spcnt += lemonStrlen(g_argv[i])+1;
@@ -2708,7 +2710,7 @@ static void parseonetoken(struct pstate *psp)
       ** in order to control their assigned integer number.  The number for
       ** each token is assigned when it is first seen.  So by including
       **
-      **     %token ONE TWO THREE
+      **     %token ONE TWO THREE.
       **
       ** early in the grammar file, that assigns small consecutive values
       ** to each of the tokens ONE TWO and THREE.
@@ -3013,6 +3015,7 @@ void Parse(struct lemon *gp)
     }
     if( c=='/' && cp[1]=='*' ){          /* Skip C style comments */
       cp+=2;
+      if( (*cp)=='/' ) cp++;
       while( (c= *cp)!=0 && (c!='/' || cp[-1]!='*') ){
         if( c=='\n' ) lineno++;
         cp++;
@@ -3513,7 +3516,7 @@ void ReportOutput(struct lemon *lemp)
 }
 
 /* Search for the file "name" which is in the same directory as
-** the exacutable */
+** the executable */
 PRIVATE char *pathsearch(char *argv0, char *name, int modemask)
 {
   const char *pathlist;
@@ -3571,7 +3574,9 @@ PRIVATE int compute_action(struct lemon *lemp, struct action *ap)
       /* Since a SHIFT is inherient after a prior REDUCE, convert any
       ** SHIFTREDUCE action with a nonterminal on the LHS into a simple
       ** REDUCE action: */
-      if( ap->sp->index>=lemp->nterminal ){
+      if( ap->sp->index>=lemp->nterminal
+       && (lemp->errsym==0 || ap->sp->index!=lemp->errsym->index)
+      ){
         act = lemp->minReduce + ap->x.rp->iRule;
       }else{
         act = lemp->minShiftReduce + ap->x.rp->iRule;
@@ -3868,7 +3873,7 @@ PRIVATE int translate_code(struct lemon *lemp, struct rule *rp){
     lhsdirect = 1;
   }else if( rp->rhsalias[0]==0 ){
     /* The left-most RHS symbol has no value.  LHS direct is ok.  But
-    ** we have to call the distructor on the RHS symbol first. */
+    ** we have to call the destructor on the RHS symbol first. */
     lhsdirect = 1;
     if( has_destructor(rp->rhs[0],lemp) ){
       append_str(0,0,0,0);
@@ -4090,7 +4095,7 @@ void print_stack_union(
   int *plineno,               /* Pointer to the line number */
   int mhflag                  /* True if generating makeheaders output */
 ){
-  int lineno = *plineno;    /* The line number of the output */
+  int lineno;               /* The line number of the output */
   char **types;             /* A hash table of datatypes */
   int arraysize;            /* Size of the "types" array */
   int maxdtlength;          /* Maximum length of any ".datatype" field. */
@@ -4286,7 +4291,6 @@ void ReportTable(
   int sqlFlag     /* Generate the *.sql file too */
 ){
   FILE *out, *in, *sql;
-  char line[LINESIZE];
   int  lineno;
   struct state *stp;
   struct action *ap;
@@ -4761,7 +4765,6 @@ void ReportTable(
   /* Generate a table containing the symbolic name of every symbol
   */
   for(i=0; i<lemp->nsymbol; i++){
-    lemon_sprintf(line,"\"%s\",",lemp->symbols[i]->name);
     fprintf(out,"  /* %4d */ \"%s\",\n",i, lemp->symbols[i]->name); lineno++;
   }
   tplt_xfer(lemp->name,in,out,&lineno);
@@ -4849,7 +4852,7 @@ void ReportTable(
   ** yyRuleInfoNRhs[].
   **
   ** Note: This code depends on the fact that rules are number
-  ** sequentually beginning with 0.
+  ** sequentially beginning with 0.
   */
   for(i=0, rp=lemp->rule; rp; rp=rp->next, i++){
     fprintf(out,"  %4d,  /* (%d) ", rp->lhs->index, i);
@@ -5337,7 +5340,8 @@ int Strsafe_insert(const char *data)
       newnp->from = &(array.ht[h]);
       array.ht[h] = newnp;
     }
-    free(x1a->tbl);
+    /* free(x1a->tbl); // This program was originally for 16-bit machines.
+    ** Don't worry about freeing memory on modern platforms. */
     *x1a = array;
   }
   /* Insert the new data */
@@ -5505,7 +5509,9 @@ int Symbol_insert(struct symbol *data, const char *key)
       newnp->from = &(array.ht[h]);
       array.ht[h] = newnp;
     }
-    free(x2a->tbl);
+    /* free(x2a->tbl); // This program was originally written for 16-bit
+    ** machines.  Don't worry about freeing this trivial amount of memory
+    ** on modern platforms.  Just leak it. */
     *x2a = array;
   }
   /* Insert the new data */
@@ -5841,7 +5847,9 @@ int Configtable_insert(struct config *data)
       newnp->from = &(array.ht[h]);
       array.ht[h] = newnp;
     }
-    free(x4a->tbl);
+    /* free(x4a->tbl); // This code was originall written for 16-bit machines.
+    ** on modern machines, don't worry about freeing this trival amount of
+    ** memory. */
     *x4a = array;
   }
   /* Insert the new data */
diff --git a/thirdparty/lemon/lempar.c b/thirdparty/lemon/lempar.c
index 71a51cf448..8cc57897db 100644
--- a/thirdparty/lemon/lempar.c
+++ b/thirdparty/lemon/lempar.c
@@ -223,9 +223,9 @@ struct yyParser {
 };
 typedef struct yyParser yyParser;
 
+#include <assert.h>
 #ifndef NDEBUG
 #include <stdio.h>
-#include <assert.h>
 static FILE *yyTraceFILE = 0;
 static char *yyTracePrompt = 0;
 #endif /* NDEBUG */
@@ -718,55 +718,6 @@ static YYACTIONTYPE yy_reduce(
   (void)yyLookahead;
   (void)yyLookaheadToken;
   yymsp = yypParser->yytos;
-  assert( yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) );
-#ifndef NDEBUG
-  if( yyTraceFILE ){
-    yysize = yyRuleInfoNRhs[yyruleno];
-    if( yysize ){
-      fprintf(yyTraceFILE, "%sReduce %d [%s]%s, pop back to state %d.\n",
-        yyTracePrompt,
-        yyruleno, yyRuleName[yyruleno],
-        yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action",
-        yymsp[yysize].stateno);
-    }else{
-      fprintf(yyTraceFILE, "%sReduce %d [%s]%s.\n",
-        yyTracePrompt, yyruleno, yyRuleName[yyruleno],
-        yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action");
-    }
-  }
-#endif /* NDEBUG */
-
-  /* Check that the stack is large enough to grow by a single entry
-  ** if the RHS of the rule is empty.  This ensures that there is room
-  ** enough on the stack to push the LHS value */
-  if( yyRuleInfoNRhs[yyruleno]==0 ){
-#ifdef YYTRACKMAXSTACKDEPTH
-    if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
-      yypParser->yyhwm++;
-      assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack));
-    }
-#endif
-#if YYSTACKDEPTH>0 
-    if( yypParser->yytos>=yypParser->yystackEnd ){
-      yyStackOverflow(yypParser);
-      /* The call to yyStackOverflow() above pops the stack until it is
-      ** empty, causing the main parser loop to exit.  So the return value
-      ** is never used and does not matter. */
-      return 0;
-    }
-#else
-    if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz-1] ){
-      if( yyGrowStack(yypParser) ){
-        yyStackOverflow(yypParser);
-        /* The call to yyStackOverflow() above pops the stack until it is
-        ** empty, causing the main parser loop to exit.  So the return value
-        ** is never used and does not matter. */
-        return 0;
-      }
-      yymsp = yypParser->yytos;
-    }
-#endif
-  }
 
   switch( yyruleno ){
   /* Beginning here are the reduction cases.  A typical example
@@ -925,12 +876,56 @@ void Parse(
   }
 #endif
 
-  do{
+  while(1){ /* Exit by "break" */
+    assert( yypParser->yytos>=yypParser->yystack );
     assert( yyact==yypParser->yytos->stateno );
     yyact = yy_find_shift_action((YYCODETYPE)yymajor,yyact);
     if( yyact >= YY_MIN_REDUCE ){
-      yyact = yy_reduce(yypParser,yyact-YY_MIN_REDUCE,yymajor,
-                        yyminor ParseCTX_PARAM);
+      unsigned int yyruleno = yyact - YY_MIN_REDUCE; /* Reduce by this rule */
+#ifndef NDEBUG
+      assert( yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) );
+      if( yyTraceFILE ){
+        int yysize = yyRuleInfoNRhs[yyruleno];
+        if( yysize ){
+          fprintf(yyTraceFILE, "%sReduce %d [%s]%s, pop back to state %d.\n",
+            yyTracePrompt,
+            yyruleno, yyRuleName[yyruleno],
+            yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action",
+            yypParser->yytos[yysize].stateno);
+        }else{
+          fprintf(yyTraceFILE, "%sReduce %d [%s]%s.\n",
+            yyTracePrompt, yyruleno, yyRuleName[yyruleno],
+            yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action");
+        }
+      }
+#endif /* NDEBUG */
+
+      /* Check that the stack is large enough to grow by a single entry
+      ** if the RHS of the rule is empty.  This ensures that there is room
+      ** enough on the stack to push the LHS value */
+      if( yyRuleInfoNRhs[yyruleno]==0 ){
+#ifdef YYTRACKMAXSTACKDEPTH
+        if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
+          yypParser->yyhwm++;
+          assert( yypParser->yyhwm ==
+                  (int)(yypParser->yytos - yypParser->yystack));
+        }
+#endif
+#if YYSTACKDEPTH>0 
+        if( yypParser->yytos>=yypParser->yystackEnd ){
+          yyStackOverflow(yypParser);
+          break;
+        }
+#else
+        if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz-1] ){
+          if( yyGrowStack(yypParser) ){
+            yyStackOverflow(yypParser);
+            break;
+          }
+        }
+#endif
+      }
+      yyact = yy_reduce(yypParser,yyruleno,yymajor,yyminor ParseCTX_PARAM);
     }else if( yyact <= YY_MAX_SHIFTREDUCE ){
       yy_shift(yypParser,yyact,(YYCODETYPE)yymajor,yyminor);
 #ifndef YYNOERRORRECOVERY
@@ -986,14 +981,13 @@ void Parse(
         yy_destructor(yypParser, (YYCODETYPE)yymajor, &yyminorunion);
         yymajor = YYNOCODE;
       }else{
-        while( yypParser->yytos >= yypParser->yystack
-            && (yyact = yy_find_reduce_action(
-                        yypParser->yytos->stateno,
-                        YYERRORSYMBOL)) > YY_MAX_SHIFTREDUCE
-        ){
+        while( yypParser->yytos > yypParser->yystack ){
+          yyact = yy_find_reduce_action(yypParser->yytos->stateno,
+                                        YYERRORSYMBOL);
+          if( yyact<=YY_MAX_SHIFTREDUCE ) break;
           yy_pop_parser_stack(yypParser);
         }
-        if( yypParser->yytos < yypParser->yystack || yymajor==0 ){
+        if( yypParser->yytos <= yypParser->yystack || yymajor==0 ){
           yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
           yy_parse_failed(yypParser);
 #ifndef YYNOERRORRECOVERY
@@ -1043,7 +1037,7 @@ void Parse(
       break;
 #endif
     }
-  }while( yypParser->yytos>yypParser->yystack );
+  }
 #ifndef NDEBUG
   if( yyTraceFILE ){
     yyStackEntry *i;