The conflict between append and parallel should take the config file into account.

1 files changed, 4 insertions, 4 deletions

diff --git a/coverage/cmdline.py b/coverage/cmdline.py
index 413fbba..9f64f01 100644
--- a/coverage/cmdline.py
+++ b/coverage/cmdline.py
@@ -548,15 +548,15 @@ class CoverageScript(object):
             self.help_fn("Nothing to do.")
             return False
 
-        if options.append and options.parallel_mode:
-            self.help_fn("Can't append to data files in parallel mode.")
-            return False
-
         return True
 
     def do_run(self, options, args):
         """Implementation of 'coverage run'."""
 
+        if options.append and self.coverage.get_option("run:parallel"):
+            self.help_fn("Can't append to data files in parallel mode.")
+            return ERR
+
         if not self.coverage.get_option("run:parallel"):
             if not options.append:
                 self.coverage.erase()