Fix traceback reporting for exceptions with __cause__ cycles.

2018-08-11 08:54:48 -07:00
parent 64faa41d06
commit 17644ff285
3 changed files with 49 additions and 1 deletions
--- a/src/_pytest/_code/code.py
+++ b/src/_pytest/_code/code.py
@@ -719,7 +719,9 @@ class FormattedExcinfo(object):
            repr_chain = []
            e = excinfo.value
            descr = None
-            while e is not None:
+            seen = set()
+            while e is not None and id(e) not in seen:
+                seen.add(id(e))
                if excinfo:
                    reprtraceback = self.repr_traceback(excinfo)
                    reprcrash = excinfo._getreprcrash()