#1574217: only swallow AttributeErrors in isinstance, not everything.
Patch and tests by Brian Harring, with improvements by Ralf Schmitt.
diff --git a/Misc/ACKS b/Misc/ACKS
index 3cb3a29..9c003e9 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -337,6 +337,7 @@
Lynda Hardman
Derek Harland
Jason Harper
+Brian Harring
Larry Hastings
Shane Hathaway
Rycharde Hawkes
diff --git a/Misc/NEWS b/Misc/NEWS
index cb0e19d..76bf481 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
Core and Builtins
-----------------
+- Issue #1574217: isinstance now catches only AttributeError, rather than
+ masking all errors.
+
- Issue #10391: Don't dereference invalid memory in error messages in the ast
module.