declaration:
   attribute* 
   ;
declaration2:
     aliasDeclaration
   | aliasThisDeclaration
   | classDeclaration
   | conditionalDeclaration
   | constructor
   | destructor
   | enumDeclaration
   | functionDeclaration
   | importDeclaration
   | interfaceDeclaration
   | mixinDeclaration
   | mixinTemplateDeclaration
   | pragmaDeclaration
   | sharedStaticConstructor
   | sharedStaticDestructor
   | staticAssertDeclaration
   | staticConstructor
   | staticDestructor
   | structDeclaration
   | templateDeclaration
   | unionDeclaration
   | unittest
   | variableDeclaration
   | attributeDeclaration
   | invariant
   | versionSpecification
   | debugSpecification
   | '{' declaration+ '}'
   ;