Upgrade to coverage 3.7.1 and have it auto-build itself on first use.

third_party/coverage-3.7.1/coverage/report.py

 """Reporter foundation for Coverage."""
 
 import fnmatch, os
 from coverage.codeunit import code_unit_factory
 from coverage.files import prep_patterns
 from coverage.misc import CoverageException, NoSource, NotPython
 
 class Reporter(object):
     """A base class for all reporters."""
 
@@ skipping 72 matching lines @@
             try:
                 report_fn(cu, self.coverage._analyze(cu))
             except NoSource:
                 if not self.config.ignore_errors:
                     raise
             except NotPython:
                 # Only report errors for .py files, and only if we didn't
                 # explicitly suppress those errors.
                 if cu.should_be_python() and not self.config.ignore_errors:
                     raise