Third time's a charm: a better fix than using either a subshell or

"setopt localoptions" is to use a function for the final test (since
it destroys all the variables in the environment).  This allows us to
directly test that the environment was properly restored after the
function call, and ensures that the caller (ZTST_execchunk, which
directly exec'ed the test code) still has all the vars that it expects
in the environment (such as ZTST_verbose, options, and ZTST_mainopts).

Test/B02typeset.ztst

@@ -23,7 +23,7 @@
 
 %prep
 
-  setopt localoptions noglob
+  setopt noglob
 
   scalar=scalar
   array=(a r r a y)
@@ -341,16 +341,21 @@
 0q:Stress test: all parameters are local and unset, using -m
 >scalar a r y
 
- # The first declare works around the "not an identifier" bug with -h
- declare \! \# \$ \* - \? @ 0
- typeset -h +g -m \*
- unset -m \*
- integer i=9
- float -H f=9
- declare -t scalar
- declare -H -a array
- typeset
- typeset +
+ local parentenv=preserved
+ fn() {
+  # The first declare works around the "not an identifier" bug with -h
+  declare \! \# \$ \* - \? @ 0
+  typeset -h +g -m \*
+  unset -m \*
+  integer i=9
+  float -H f=9
+  declare -t scalar
+  declare -H -a array
+  typeset
+  typeset +
+ }
+ fn
+ echo $parentenv
 0:Parameter hiding and tagging, printing types and values
 >array local array
 >float local f
@@ -360,3 +365,4 @@
 >float local f
 >integer local i
 >local tagged scalar
+>preserved