test.md

Identifier

  identifier
    : ....
    ;

Access

  accessModifier
    : 'access' '(' entity ')'
    ;

  entity
    : 'all' | 'self' | 'contract' | 'account' | identifier
    ;

Struct Declaration

  structDeclaration
    : accessModifier 'struct' identifier conformances? '{' membersAndNestedDeclarations '}'
    ;