extend highlight groups

Pick up
(array_at)
(array_star)
(expansion_flags)
(expansion_modifiers)
(simple_variable_name)
(glob_pattern)
(expansion_style) - and therefore hash in ${#variable}

runtime/queries/zsh/highlights.scm

@@ -102,7 +102,7 @@
 
 "function" @keyword.function
 
-(special_variable_name) @constant
+(special_variable_name) @variable.builtin
 
 ; trap -l
 ((word) @constant.builtin
@@ -209,6 +209,23 @@
 
 "``" @punctuation.special
 
+(array_star) @variable.builtin
+
+(array_at) @variable.builtin
+
+(expansion_flags)  @attribute.builtin
+
+(expansion_style)  @attribute.builtin
+
+(expansion_pattern
+  pattern: ("#" @attribute.builtin))
+
+(expansion_modifier) @attribute.builtin
+
+(simple_variable_name)  @variable
+
+(glob_pattern) @string.regexp
+
 (variable_name) @variable
 
 ((variable_name) @constant