Set the rcfile for multiprocessing subprocesses

1 files changed, 2 insertions, 1 deletions

diff --git a/coverage/config.py b/coverage/config.py
index 23ec2328..d6f5af0a 100644
--- a/coverage/config.py
+++ b/coverage/config.py
@@ -9,7 +9,7 @@ import re
 import sys
 
 from coverage.backward import configparser, iitems, string_class
-from coverage.misc import CoverageException, isolate_module
+from coverage.misc import contract, CoverageException, isolate_module
 
 os = isolate_module(os)
 
@@ -201,6 +201,7 @@ class CoverageConfig(object):
                     v = [v]
                 setattr(self, k, v)
 
+    @contract(filename=str)
     def from_file(self, filename, section_prefix=""):
         """Read configuration from a .rc file.