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-rw-r--r--Test/E01options.ztst12
1 files changed, 12 insertions, 0 deletions
diff --git a/Test/E01options.ztst b/Test/E01options.ztst
index 1fbe0cc93..0ce82b3ab 100644
--- a/Test/E01options.ztst
+++ b/Test/E01options.ztst
@@ -655,6 +655,18 @@
 >This is in1
 >This is in2
 
+# This is trickier than it looks.  There's a hack at the end of
+# execcmd() to catch the multio processes attached to the
+# subshell, which otherwise sort of get lost in the general turmoil.
+# Without that, the multios aren't synchronous with the subshell
+# or the main shell starting the "cat", so the output files appear
+# empty.
+  setopt multios
+  ( echo hello ) >multio_out1 >multio_out2 && cat multio_out*
+0:Multios attached to a subshell
+>hello
+>hello
+
 # tried this with other things, but not on its own, so much.
   unsetopt nomatch
   print with nonomatch: flooble*