ECMAScript Harmony - conflicting states in grammar

esharmony-export-confilcts

Program        ::= ProgramElement*
ProgramElement ::= Statement
                |  VariableDeclaration
                |  FunctionDeclaration
                |  ImportDeclaration
                |  ExportDeclaration
                |  ModuleDeclaration

ModuleSpecifier   ::= StringLiteral | Path
ModuleDeclaration ::= "module" Id "at" String ";"
                   |  "module" Id "is" ImportSource ";"
                   |  "module" Id "{" ModuleBody "}"

ImportSource       ::=   Id ("from" ModuleSpecifier)?
ImportDeclaration  ::=   "import" ImportSpecifierSet "from" ModuleSpecifier ";"
ImportSpecifierSet ::=   Id
                    |    "*"
                    |    "{" ImportSpecifier ("," ImportSpecifier)* "}"
ImportSpecifier    ::=   Id (":" Id)?

ExportDeclaration  ::=  "export" ExportSpecifierSet ("," ExportSpecifierSet)* ";"
                    |   "export" VariableDeclaration
                    |   "export" FunctionDeclaration
                    |   "export" ModuleDeclaration

/**
 *
 * This rule holds the modification
 *
**/
ExportSpecifierSet ::=  "{" ExportSpecifier ("," ExportSpecifier)* "}"
                    |   Id 
                    |   "*" ("from" Path)?
ExportSpecifier    ::=  Id (":" Path)?

ModuleBody    ::= ModuleElement*
ModuleElement ::= Statement
               |  VariableDeclaration
               |  FunctionDeclaration
               |  ModuleDeclaration
               |  ImportDeclaration
               |  ExportDeclaration