Oops, 'redo t/c.c' didn't work, because find_do_file() was slightly wrong.

We weren't searching for default.*.do in the subdir when needed.

redo.py

@@ -62,7 +62,8 @@ def _possible_do_files(t):
         basename = '.'.join(l[:i])
         ext = '.'.join(l[i:])
         if ext: ext = '.' + ext
-        yield "default%s.do" % ext, basename, ext
+        yield (os.path.join(dirname, "default%s.do" % ext),
+               os.path.join(dirname, basename), ext)
 
 
 def find_do_file(t):

test.do

@@ -1,2 +1,2 @@
-redo-ifchange t/all
+redo-ifchange t/c.c t/all
 ./wvtestrun "$REDO" runtests >&2