From 9cad4eb91de491e6a03fbd7d1ded7f5aef0a329c Mon Sep 17 00:00:00 2001
From: Calvin Rose <calsrose@gmail.com>
Date: Fri, 3 Aug 2018 19:46:15 -0400
Subject: [PATCH] Change function arity error message.

---
 src/core/vm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/core/vm.c b/src/core/vm.c
index 4999a4d3..303df758 100644
--- a/src/core/vm.c
+++ b/src/core/vm.c
@@ -1195,9 +1195,11 @@ static void *op_lookup[255] = {
     /* Handle function calls with bad arity */
     vm_arity_error:
     {
-        retreg = dst_wrap_string(dst_formatc("calling %V got %d arguments, expected %d",
+        int32_t nargs = fiber->stacktop - fiber->stackstart;
+        retreg = dst_wrap_string(dst_formatc("%V called with %d argument%s, expected %d",
                     dst_wrap_function(func),
-                    fiber->stacktop - fiber->stackstart,
+                    nargs,
+                    nargs == 1 ? "" : "s",
                     func->def->arity));
         signal = DST_SIGNAL_ERROR;
         goto vm_exit;