From bc29f43bbd0758ff258b79dda40e7f45c4574ea8 Mon Sep 17 00:00:00 2001
From: Bob Nystrom <robert@stuffwithstuff.com>
Date: Mon, 27 Jun 2016 07:08:08 -0700
Subject: [PATCH] Allow hosts with no module loader to still load optional
 modules.

If the host doesn't set a loadModuleFn at all in the config, it should
still be able to load random, meta, etc.
---
 src/vm/wren_vm.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/vm/wren_vm.c b/src/vm/wren_vm.c
index 4163cf0f..6bad8bc1 100644
--- a/src/vm/wren_vm.c
+++ b/src/vm/wren_vm.c
@@ -1339,10 +1339,15 @@ Value wrenImportModule(WrenVM* vm, Value name)
 {
   // If the module is already loaded, we don't need to do anything.
   if (!IS_UNDEFINED(wrenMapGet(vm->modules, name))) return NULL_VAL;
-  
-  // Load the module's source code from the host.
-  const char* source = vm->config.loadModuleFn(vm, AS_CSTRING(name));
-  
+
+  const char* source = NULL;
+
+  // Let the host try to provide the module.
+  if (vm->config.loadModuleFn != NULL)
+  {
+    source = vm->config.loadModuleFn(vm, AS_CSTRING(name));
+  }
+
   // If the host didn't provide it, see if it's a built in optional module.
   if (source == NULL)
   {