--- a/relnotes/next Sun Sep 08 20:09:31 2019 -0400
+++ b/relnotes/next Mon Sep 09 12:56:17 2019 -0700
@@ -9,6 +9,11 @@
== Backwards Compatibility Changes ==
+ * A shell that supports `$(command)`` syntax for command substitution is now
+ required for running the test suite. The test runner normally uses
+ `sh`, so if that is a shell that doesn't support `$(command)` syntax,
+ you can override it by setting `$HGTEST_SHELL` or by passing it to
+ `run-tests.py --shell <shell>`.
== Internal API Changes ==