storageClass:
     alignAttribute
   | linkageAttribute
   | atAttribute
   | typeConstructor
   | deprecated
   | 'abstract'
   | 'auto'
   | 'enum'
   | 'extern'
   | 'final'
   | 'virtual'
   | 'nothrow'
   | 'override'
   | 'pure'
   | 'ref'
   | '___gshared'
   | 'scope'
   | 'static'
   | 'synchronized'
   ;