From f5db2de696af7e33fdcbcf96f2be577c1e9a52e2 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Thu, 11 Apr 2013 19:24:08 +0200
Subject: improved error message for #291

---
 compiler/semcall.nim | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'compiler')

diff --git a/compiler/semcall.nim b/compiler/semcall.nim
index 46595c1e7..be41299ad 100644
--- a/compiler/semcall.nim
+++ b/compiler/semcall.nim
@@ -174,7 +174,10 @@ proc explicitGenericInstantiation(c: PContext, n: PNode, s: PSym): PNode =
     # common case; check the only candidate has the right
     # number of generic type parameters:
     if safeLen(s.ast.sons[genericParamsPos]) != n.len-1:
-      return explicitGenericInstError(n)
+      let expected = safeLen(s.ast.sons[genericParamsPos])
+      LocalError(n.info, errGenerated, "cannot instantiate: " & renderTree(n) &
+         "; got " & $(n.len-1) & " type(s) but expected " & $expected)
+      return n
     result = explicitGenericSym(c, n, s)
   elif a.kind in {nkClosedSymChoice, nkOpenSymChoice}:
     # choose the generic proc with the proper number of type parameters.
-- 
cgit 1.4.1-2-gfad0