info_formatter shouldn't assume it gets a list

2 files changed, 5 insertions, 0 deletions

diff --git a/coverage/debug.py b/coverage/debug.py
index 6e7af242..c441dffd 100644
--- a/coverage/debug.py
+++ b/coverage/debug.py
@@ -41,6 +41,7 @@ def info_formatter(info):
     nicely formatted, ready to print.
 
     """
+    info = list(info)
     label_len = max(len(l) for l, _d in info)
     for label, data in info:
         if data == []:
diff --git a/tests/test_debug.py b/tests/test_debug.py
index 33bca442..8aad9257 100644
--- a/tests/test_debug.py
+++ b/tests/test_debug.py
@@ -31,6 +31,10 @@ class InfoFormatterTest(CoverageTest):
             '        nothing: -none-',
         ])
 
+    def test_info_formatter_with_generator(self):
+        lines = list(info_formatter(('info%d' % i, i) for i in range(3)))
+        self.assertEqual(lines, ['info0: 0', 'info1: 1', 'info2: 2'])
+
 
 class DebugTraceTest(CoverageTest):
     """Tests of debug output."""