1 files changed, 22 insertions, 0 deletions
diff --git a/tests/array23.sub b/tests/array23.sub
new file mode 100644
index 00000000..a762aadb
--- /dev/null
+++ b/tests/array23.sub
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+# this captures how bash and ksh93 expand indexed array subscripts in
+# various contexts. if changes are ever made, or an option added to do
+# this differently, the diffs will show up here
+
+typeset -a array
+
+index='$( echo >&2 foo )' # Literal shell code should never be evaluated unless an 'eval' is involved.
+
+echo ${array[ $index ]} # [] expands $index, results in a literal that [] does not re-evaluate.
+echo $(( $index )) # (( )) expands $index, results in a literal that (( )) does not re-evaluate.
+echo $(( array[ $index ] )) # (( )) expands $index, results in a literal that  [] DOES re-evaluate.
+
+(( array[ $index ] ))
+
+typeset -a a
+
+: $(( a[$index]=5 ))
+
+#shopt -s assoc_expand_once
+echo $((1+a[$index]))
+echo $((1+a[\$index]))
+echo "1+${a[$index]}"