From 0de5191eaec0321118254673e8f8414228668818 Mon Sep 17 00:00:00 2001
From: Luca Falavigna <dktrkranz@debian.org>
Date: Wed, 10 Mar 2010 13:49:35 +0100
Subject: Imported Upstream version 1.2.0.d20100306

---
 engine/SCons/Environment.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'engine/SCons/Environment.py')

diff --git a/engine/SCons/Environment.py b/engine/SCons/Environment.py
index 23b0719..d3455e0 100644
--- a/engine/SCons/Environment.py
+++ b/engine/SCons/Environment.py
@@ -32,7 +32,7 @@ Environment
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Environment.py 4629 2010/01/17 22:23:21 scons"
+__revision__ = "src/engine/SCons/Environment.py 4691 2010/03/06 16:22:36 bdbaddog"
 
 
 import copy
@@ -152,6 +152,9 @@ def _set_BUILDERS(env, key, value):
     except KeyError:
         bd = BuilderDict(kwbd, env)
         env._dict[key] = bd
+    for k, v in value.items():
+        if not SCons.Builder.is_a_Builder(v):
+            raise SCons.Errors.UserError('%s is not a Builder.' % repr(v))
     bd.update(value)
 
 def _del_SCANNERS(env, key):
-- 
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