diff --git a/dmd/mtype.h b/dmd/mtype.h
index ebac3854..ccfbd8be 100644
--- a/dmd/mtype.h
+++ b/dmd/mtype.h
@@ -167,7 +167,7 @@ struct Type : Object
     #define tshiftcnt   tint32          // right side of shift expression
 //    #define tboolean  tint32          // result of boolean expression
     #define tboolean    tbool           // result of boolean expression
-    #define tindex      tint32          // array/ptr index
+    #define tindex      tsize_t         // array/ptr index
     static Type *tvoidptr;              // void*
     #define terror      basic[Terror]   // for error recovery
 
diff --git a/dmd/template.c b/dmd/template.c
index 767e7c97..62fc13aa 100644
--- a/dmd/template.c
+++ b/dmd/template.c
@@ -3681,7 +3681,7 @@ void TemplateInstance::semantic(Scope *sc)
     // Give additional context info if error occurred during instantiation
     if (global.errors != errorsave)
     {
-        error("error instantiating");
+        error(loc, "error instantiating");
         if (tinst)
         {   tinst->printInstantiationTrace();
             if (!global.gag)