Failing test for appending to associative array.

osh/osh.asdl

@@ -106,6 +106,11 @@ module osh
   | StringWord(id id, string s)
 
   -- TODO: Need more tokens/spids to translate a[x++]=1
+  -- These don't follow the LST design, because they're shared for
+  -- s['x']+='y' and (( s[ 42 ] ++ )).
+  -- It would be better runtime.lvalue were be the shared representation, and
+  -- there were 2 different lhs_expr types.  They both should contribute their
+  -- location information.
   lhs_expr =
     LhsName(string name)
   | LhsIndexedName(string name, arith_expr index)

spec/assoc.test.sh

@@ -106,3 +106,13 @@ echo "${a[@]}"
 #echo "${!a[@]}"
 ## N-I mksh stdout-json: ""
 ## BUG bash stdout-json: "3\n"
+
+#### Append to associative array value
+declare -A a
+a['x']+='foo'
+a['x']+='bar'
+argv.py "${a["x"]}"
+## STDOUT:
+['foobar']
+## END
+

test/spec.sh

@@ -522,7 +522,7 @@ append() {
 
 # associative array -- mksh and zsh implement different associative arrays.
 assoc() {
-  sh-spec spec/assoc.test.sh --osh-failures-allowed 10 \
+  sh-spec spec/assoc.test.sh --osh-failures-allowed 11 \
     $BASH $OSH_LIST "$@"
 }