[PATCH] Tests for 50126, 50136, and 50149

[Bart Schaefer <schaefer@brasslantern.com>]

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These are short, so I kept them all in one patch.

I was surprised that the existing Xfail test for temp file removal was
still failing, so I added some explanatory comments.  That one can
probably be fixed after release.

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diff --git a/Test/D03procsubst.ztst b/Test/D03procsubst.ztst
index 1e5cd9f6c..d68db35fa 100644
--- a/Test/D03procsubst.ztst
+++ b/Test/D03procsubst.ztst
@@ -167,5 +167,25 @@
     print -rC1 -- $TMPPREFIX*(N)
   }
 0f:external command with =(...) on LHS of pipeline cleans up its tempfiles
+F:subshells including pipe LHS do not pass through zexit()
 # (Expected result: no output.)
 
+# Confirm tempfile exists in the function, but not after exit
+  () {
+    local -x TMPPREFIX=$PWD/exit
+    $ZTST_testdir/../Src/zsh -fc '
+     () {
+       print -rC1 -- $TMPPREFIX*
+       exit
+     } =(sleep 5)
+    '
+    print -rC1 -- $TMPPREFIX*(N)
+  }
+0:regression test: exit in shell function cleans up tempfiles
+F:see preceding test
+*>*.tmp/exit*
+
+  print -u $ZTST_fd 'This test hangs the shell when it fails...'
+  true | false =(nosuchcommand$$)
+1:regression test: race condition with pipe and procsubst
+*?\(eval\):2: command not found: nosuchcommand*
diff --git a/Test/E01options.ztst b/Test/E01options.ztst
index 72749e6ab..b57b23557 100644
--- a/Test/E01options.ztst
+++ b/Test/E01options.ztst
@@ -752,6 +752,12 @@
 >These are the contents of the file
 >These are the contents of the file
 
+# Subshell to shield nullexec redirections
+  ( exec 3>&1 3>&2; print -u 3 some words )
+0:regression test: multios with nullexec
+>some words
+?some words
+
 # tried this with other things, but not on its own, so much.
   unsetopt nomatch
   print with nonomatch: flooble*