[PATCH] test: Make gen-threads work with python3

[Jesse Rosenthal]

python3 doesn't allow dictionaries to be initialized with non-string
keywords. This presents problems on systems in which "python" means
"python3". We instead initalize the dictionary using the dict
comprehension and then update it with the values from the tree. This
will work with both python2 and python3.
---
 test/gen-threads.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/gen-threads.py b/test/gen-threads.py
index 9fbb847..70fb1f6 100644
--- a/test/gen-threads.py
+++ b/test/gen-threads.py
@@ -2,7 +2,6 @@
 # argv[1].  Each output line is a thread structure, where the n'th
 # field is either a number giving the parent of message n or "None"
 # for the root.
-
 import sys
 from itertools import chain, combinations
 
@@ -28,6 +27,7 @@ while queue:
     else:
         # Expand node to_expand[0] with each possible set of children
         for children in subsets(free):
-            ntree = dict(tree, **{child: to_expand[0] for child in children})
+            ntree = {child: to_expand[0] for child in children}
+            ntree.update(tree)
             nfree = free.difference(children)
             queue.append((ntree, nfree, to_expand[1:] + tuple(children)))
-- 
2.1.2