diff --git a/README.md b/README.md
index ed320e4..95733a1 100644
--- a/README.md
+++ b/README.md
@@ -641,7 +641,6 @@ Fold Functions
   <tr><td><code>mpc_val_t *mpcf_snd_free(int n, mpc_val_t** xs);</code></td><td>Returns second element of <code>xs</code> and calls <code>free</code> on others</td></tr>
   <tr><td><code>mpc_val_t *mpcf_trd_free(int n, mpc_val_t** xs);</code></td><td>Returns third element of <code>xs</code> and calls <code>free</code> on others</td></tr>
   <tr><td><code>mpc_val_t *mpcf_strfold(int n, mpc_val_t** xs);</code></td><td>Concatenates all <code>xs</code> together as strings and returns result </td></tr>
-  <tr><td><code>mpc_val_t *mpcf_maths(int n, mpc_val_t** xs);</code></td><td>Examines second argument as string to see which operator it is, then operators on first and third argument as if they are <code>int*</code>.</td></tr>
 
 </table>
 
diff --git a/examples/doge.c b/examples/doge.c
index f7331fe..597eebc 100644
--- a/examples/doge.c
+++ b/examples/doge.c
@@ -12,7 +12,7 @@ int main(int argc, char **argv) {
     " noun      : \"lisp\" | \"language\" | \"c\" | \"book\" | \"build\"; "
     " phrase    : <adjective> <noun>;                                     "
     " doge      : /^/ <phrase>* /$/;                                      ",
-    Adjective, Noun, Phrase, Doge);
+    Adjective, Noun, Phrase, Doge, NULL);
 
   if (argc > 1) {
     
diff --git a/examples/lispy.c b/examples/lispy.c
index f3977f3..982bf0b 100644
--- a/examples/lispy.c
+++ b/examples/lispy.c
@@ -21,7 +21,7 @@ int main(int argc, char **argv) {
     " expr                : <number>  | <symbol> | <string>    "
     "                     | <comment> | <sexpr>  | <qexpr> ;   "
     " lispy               : /^/ <expr>* /$/ ;                  ",
-    Number, Symbol, String, Comment, Sexpr, Qexpr, Expr, Lispy);
+    Number, Symbol, String, Comment, Sexpr, Qexpr, Expr, Lispy, NULL);
 
   if (argc > 1) {
     
diff --git a/examples/maths.c b/examples/maths.c
index 1366d0a..1bccc36 100644
--- a/examples/maths.c
+++ b/examples/maths.c
@@ -12,7 +12,12 @@ int main(int argc, char **argv) {
     " product : <value>   (('*' | '/')   <value>)*;    "
     " value : /[0-9]+/ | '(' <expression> ')';         "
     " maths : /^/ <expression> /$/;                    ",
-    Expr, Prod, Value, Maths);
+    Expr, Prod, Value, Maths, NULL);
+  
+  mpc_print(Expr);
+  mpc_print(Prod);
+  mpc_print(Value);
+  mpc_print(Maths);
   
   if (argc > 1) {
     
diff --git a/examples/smallc.c b/examples/smallc.c
index d061c2b..ffc6683 100644
--- a/examples/smallc.c
+++ b/examples/smallc.c
@@ -60,7 +60,7 @@ int main(int argc, char **argv) {
     " includes  : (\"#include\" <string>)* ;                           \n"
     " smallc    : /^/ <includes> <decls> <procedure>* <main> /$/ ;     \n",
     Ident, Number, Character, String, Factor, Term, Lexp, Stmt, Exp, 
-    Typeident, Decls, Args, Body, Procedure, Main, Includes, Smallc);
+    Typeident, Decls, Args, Body, Procedure, Main, Includes, Smallc, NULL);
   
   if (err != NULL) {
     mpc_err_print(err);
diff --git a/mpc.c b/mpc.c
index b2b341d..4f9dba9 100644
--- a/mpc.c
+++ b/mpc.c
@@ -157,9 +157,8 @@ char *mpc_err_string(mpc_err_t *x) {
   
   if (x->failure) {
     mpc_err_string_cat(buffer, &pos, &max,
-    "error: %s\n", 
-      x->filename, x->state.row+1, 
-      x->state.col+1, x->failure);
+    "%s: error: %s\n", 
+      x->filename, x->failure);
     return buffer;
   }
   
@@ -2867,6 +2866,7 @@ static mpc_parser_t *mpca_grammar_find_parser(char *x, mpca_grammar_st_t *st) {
     /* Search Existing Parsers */
     for (i = 0; i < st->parsers_num; i++) {
       mpc_parser_t *p = st->parsers[i];
+      if (p == NULL) { return mpc_failf("Unknown Parser '%s'!", x); }
       if (p->name && strcmp(p->name, x) == 0) { return p; }
     }
     
@@ -2879,10 +2879,7 @@ static mpc_parser_t *mpca_grammar_find_parser(char *x, mpca_grammar_st_t *st) {
       st->parsers = realloc(st->parsers, sizeof(mpc_parser_t*) * st->parsers_num);
       st->parsers[st->parsers_num-1] = p;
       
-      if (p == NULL) {
-        return mpc_failf("Unknown Parser '%s'!", x);
-      }
-      
+      if (p == NULL) { return mpc_failf("Unknown Parser '%s'!", x); }
       if (p->name && strcmp(p->name, x) == 0) { return p; }
       
     }