diff --git a/src/exec.c b/src/exec.c
index 38b1831..d20d32a 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -14,6 +14,7 @@ ASTNumData exec_exp(AST* ast) {
         case AST_TYPE_CALL: return exec_call(ast);
         case AST_TYPE_NUM:  return *(ASTNumData*)ast->data;
         default:            printf("what\n");
+                            exit(1);
     }
 }
 
diff --git a/src/grammar.y b/src/grammar.y
index 4b2ae93..cc46167 100644
--- a/src/grammar.y
+++ b/src/grammar.y
@@ -61,7 +61,7 @@ exp:
     | LGROUP exp RGROUP { $$ = $2; }
 
     // Variable reference.
-    | WORD
+    //| WORD
 
     // Function call.
     // name(thing, thing)