# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 2015-11-22 06:28:01
# Node ID 4e554a7df1e977735cf4143c590d768a9fb69b39
# Parent  9eeca021a80337e04734c608241e85557c0b1ecf

demandimport: don't enable when running under PyPy

On demand importing doesn't work with PyPy for some reason. Don't honor
requests to enable demand importing when running under PyPy.

diff --git a/mercurial/demandimport.py b/mercurial/demandimport.py
--- a/mercurial/demandimport.py
+++ b/mercurial/demandimport.py
@@ -245,6 +245,10 @@ def isenabled():
 
 def enable():
     "enable global demand-loading of modules"
+    # PyPy doesn't work with demand import.
+    if '__pypy__' in sys.builtin_module_names:
+        return
+
     if os.environ.get('HGDEMANDIMPORT') != 'disable':
         builtins.__import__ = _demandimport