parseUnit(void)
  skipErrorTokens(void)
  listener: beginCompilationUnit(void)
  syntheticPreviousToken(void)
  parseTopLevelDeclarationImpl(, Instance of 'DirectiveContext')
    parseMetadataStar()
      listener: beginMetadataStar(void)
      listener: endMetadataStar(0)
    parseTopLevelMemberImpl()
      listener: beginTopLevelMember(void)
      parseTopLevelMethod(, null, null, , Instance of 'VoidType', null, foo1, false)
        listener: beginTopLevelMethod(, null, null)
        listener: handleVoidKeyword(void)
        ensureIdentifierPotentiallyRecovered(void, topLevelFunctionDeclaration, false)
          listener: handleIdentifier(foo1, topLevelFunctionDeclaration)
        parseMethodTypeVar(foo1)
          listener: handleNoTypeVariables(()
        parseGetterOrFormalParameters(foo1, foo1, false, MemberKind.TopLevelMethod)
          parseFormalParameters(foo1, MemberKind.TopLevelMethod)
            parseFormalParametersRest((, MemberKind.TopLevelMethod)
              listener: beginFormalParameters((, MemberKind.TopLevelMethod)
              parseOptionalNamedParameters((, MemberKind.TopLevelMethod)
                listener: beginOptionalFormalParameters({)
                parseFormalParameter({, FormalParameterKind.optionalNamed, MemberKind.TopLevelMethod)
                  parseMetadataStar({)
                    listener: beginMetadataStar(required)
                    listener: endMetadataStar(0)
                  reportRecoverableErrorWithToken(required, Instance of 'Template<(Token) => Message>')
                    listener: handleRecoverableError(Message[UnexpectedModifierInNonNnbd, The modifier 'required' is only available in null safe libraries., null, {lexeme: required}], required, required)
                  listener: beginFormalParameter(int, MemberKind.TopLevelMethod, required, null, null)
                  listener: handleIdentifier(int, typeReference)
                  listener: handleNoTypeArguments(x1)
                  listener: handleType(int, null)
                  ensureIdentifier(int, formalParameterDeclaration)
                    listener: handleIdentifier(x1, formalParameterDeclaration)
                  listener: handleFormalParameterWithoutValue(})
                  listener: endFormalParameter(null, null, null, x1, null, null, FormalParameterKind.optionalNamed, MemberKind.TopLevelMethod)
                listener: endOptionalFormalParameters(1, {, })
              ensureCloseParen(}, ()
              listener: endFormalParameters(1, (, ), MemberKind.TopLevelMethod)
        parseAsyncModifierOpt())
          listener: handleAsyncModifier(null, null)
          inPlainSync()
        parseFunctionBody(), false, false)
          listener: beginBlockFunctionBody({)
          notEofOrValue(}, print)
          parseStatement({)
            parseStatementX({)
              parseExpressionStatementOrDeclarationAfterModifiers({, {, null, null, null, false)
                looksLikeLocalFunction(print)
                parseExpressionStatement({)
                  parseExpression({)
                    parsePrecedenceExpression({, 1, true)
                      parseUnaryExpression({, true)
                        parsePrimary({, expression)
                          parseSendOrFunctionLiteral({, expression)
                            looksLikeFunctionBody(;)
                            parseSend({, expression)
                              isNextIdentifier({)
                              ensureIdentifier({, expression)
                                listener: handleIdentifier(print, expression)
                              listener: handleNoTypeArguments(()
                              parseArgumentsOpt(print)
                                parseArguments(print)
                                  parseArgumentsRest(()
                                    listener: beginArguments(()
                                    parseExpression(()
                                      parsePrecedenceExpression((, 1, true)
                                        parseUnaryExpression((, true)
                                          parsePrimary((, expression)
                                            parseSendOrFunctionLiteral((, expression)
                                              parseSend((, expression)
                                                isNextIdentifier(()
                                                ensureIdentifier((, expression)
                                                  listener: handleIdentifier(x, expression)
                                                listener: handleNoTypeArguments())
                                                parseArgumentsOpt(x)
                                                  listener: handleNoArguments())
                                                listener: handleSend(x, ))
                                    listener: endArguments(1, (, ))
                              listener: handleSend(print, ;)
                  ensureSemicolon())
                  listener: handleExpressionStatement(;)
          notEofOrValue(}, })
          listener: endBlockFunctionBody(1, {, })
        listener: endTopLevelMethod(void, null, })
  listener: endTopLevelDeclaration(void)
  parseTopLevelDeclarationImpl(}, Instance of 'DirectiveContext')
    parseMetadataStar(})
      listener: beginMetadataStar(void)
      listener: endMetadataStar(0)
    parseTopLevelMemberImpl(})
      listener: beginTopLevelMember(void)
      parseTopLevelMethod(}, null, null, }, Instance of 'VoidType', null, foo2, false)
        listener: beginTopLevelMethod(}, null, null)
        listener: handleVoidKeyword(void)
        ensureIdentifierPotentiallyRecovered(void, topLevelFunctionDeclaration, false)
          listener: handleIdentifier(foo2, topLevelFunctionDeclaration)
        parseMethodTypeVar(foo2)
          listener: handleNoTypeVariables(()
        parseGetterOrFormalParameters(foo2, foo2, false, MemberKind.TopLevelMethod)
          parseFormalParameters(foo2, MemberKind.TopLevelMethod)
            parseFormalParametersRest((, MemberKind.TopLevelMethod)
              listener: beginFormalParameters((, MemberKind.TopLevelMethod)
              parseOptionalNamedParameters((, MemberKind.TopLevelMethod)
                listener: beginOptionalFormalParameters({)
                parseFormalParameter({, FormalParameterKind.optionalNamed, MemberKind.TopLevelMethod)
                  parseMetadataStar({)
                    listener: beginMetadataStar(required)
                    listener: endMetadataStar(0)
                  listener: beginFormalParameter(required, MemberKind.TopLevelMethod, null, null, null)
                  listener: handleIdentifier(required, typeReference)
                  listener: handleNoTypeArguments(x2)
                  listener: handleType(required, null)
                  ensureIdentifier(required, formalParameterDeclaration)
                    listener: handleIdentifier(x2, formalParameterDeclaration)
                  listener: handleFormalParameterWithoutValue(})
                  listener: endFormalParameter(null, null, null, x2, null, null, FormalParameterKind.optionalNamed, MemberKind.TopLevelMethod)
                listener: endOptionalFormalParameters(1, {, })
              ensureCloseParen(}, ()
              listener: endFormalParameters(1, (, ), MemberKind.TopLevelMethod)
        parseAsyncModifierOpt())
          listener: handleAsyncModifier(null, null)
          inPlainSync()
        parseFunctionBody(), false, false)
          listener: beginBlockFunctionBody({)
          notEofOrValue(}, print)
          parseStatement({)
            parseStatementX({)
              parseExpressionStatementOrDeclarationAfterModifiers({, {, null, null, null, false)
                looksLikeLocalFunction(print)
                parseExpressionStatement({)
                  parseExpression({)
                    parsePrecedenceExpression({, 1, true)
                      parseUnaryExpression({, true)
                        parsePrimary({, expression)
                          parseSendOrFunctionLiteral({, expression)
                            looksLikeFunctionBody(;)
                            parseSend({, expression)
                              isNextIdentifier({)
                              ensureIdentifier({, expression)
                                listener: handleIdentifier(print, expression)
                              listener: handleNoTypeArguments(()
                              parseArgumentsOpt(print)
                                parseArguments(print)
                                  parseArgumentsRest(()
                                    listener: beginArguments(()
                                    parseExpression(()
                                      parsePrecedenceExpression((, 1, true)
                                        parseUnaryExpression((, true)
                                          parsePrimary((, expression)
                                            parseSendOrFunctionLiteral((, expression)
                                              parseSend((, expression)
                                                isNextIdentifier(()
                                                ensureIdentifier((, expression)
                                                  listener: handleIdentifier(x, expression)
                                                listener: handleNoTypeArguments())
                                                parseArgumentsOpt(x)
                                                  listener: handleNoArguments())
                                                listener: handleSend(x, ))
                                    listener: endArguments(1, (, ))
                              listener: handleSend(print, ;)
                  ensureSemicolon())
                  listener: handleExpressionStatement(;)
          notEofOrValue(}, })
          listener: endBlockFunctionBody(1, {, })
        listener: endTopLevelMethod(void, null, })
  listener: endTopLevelDeclaration(void)
  parseTopLevelDeclarationImpl(}, Instance of 'DirectiveContext')
    parseMetadataStar(})
      listener: beginMetadataStar(void)
      listener: endMetadataStar(0)
    parseTopLevelMemberImpl(})
      listener: beginTopLevelMember(void)
      parseTopLevelMethod(}, null, null, }, Instance of 'VoidType', null, foo3, false)
        listener: beginTopLevelMethod(}, null, null)
        listener: handleVoidKeyword(void)
        ensureIdentifierPotentiallyRecovered(void, topLevelFunctionDeclaration, false)
          listener: handleIdentifier(foo3, topLevelFunctionDeclaration)
        parseMethodTypeVar(foo3)
          listener: handleNoTypeVariables(()
        parseGetterOrFormalParameters(foo3, foo3, false, MemberKind.TopLevelMethod)
          parseFormalParameters(foo3, MemberKind.TopLevelMethod)
            parseFormalParametersRest((, MemberKind.TopLevelMethod)
              listener: beginFormalParameters((, MemberKind.TopLevelMethod)
              parseOptionalNamedParameters((, MemberKind.TopLevelMethod)
                listener: beginOptionalFormalParameters({)
                parseFormalParameter({, FormalParameterKind.optionalNamed, MemberKind.TopLevelMethod)
                  parseMetadataStar({)
                    listener: beginMetadataStar(required)
                    listener: endMetadataStar(0)
                  reportRecoverableErrorWithToken(required, Instance of 'Template<(Token) => Message>')
                    listener: handleRecoverableError(Message[UnexpectedModifierInNonNnbd, The modifier 'required' is only available in null safe libraries., null, {lexeme: required}], required, required)
                  listener: beginFormalParameter(required, MemberKind.TopLevelMethod, required, null, null)
                  listener: handleIdentifier(required, typeReference)
                  listener: handleNoTypeArguments(x3)
                  listener: handleType(required, null)
                  ensureIdentifier(required, formalParameterDeclaration)
                    listener: handleIdentifier(x3, formalParameterDeclaration)
                  listener: handleFormalParameterWithoutValue(})
                  listener: endFormalParameter(null, null, null, x3, null, null, FormalParameterKind.optionalNamed, MemberKind.TopLevelMethod)
                listener: endOptionalFormalParameters(1, {, })
              ensureCloseParen(}, ()
              listener: endFormalParameters(1, (, ), MemberKind.TopLevelMethod)
        parseAsyncModifierOpt())
          listener: handleAsyncModifier(null, null)
          inPlainSync()
        parseFunctionBody(), false, false)
          listener: beginBlockFunctionBody({)
          notEofOrValue(}, print)
          parseStatement({)
            parseStatementX({)
              parseExpressionStatementOrDeclarationAfterModifiers({, {, null, null, null, false)
                looksLikeLocalFunction(print)
                parseExpressionStatement({)
                  parseExpression({)
                    parsePrecedenceExpression({, 1, true)
                      parseUnaryExpression({, true)
                        parsePrimary({, expression)
                          parseSendOrFunctionLiteral({, expression)
                            looksLikeFunctionBody(;)
                            parseSend({, expression)
                              isNextIdentifier({)
                              ensureIdentifier({, expression)
                                listener: handleIdentifier(print, expression)
                              listener: handleNoTypeArguments(()
                              parseArgumentsOpt(print)
                                parseArguments(print)
                                  parseArgumentsRest(()
                                    listener: beginArguments(()
                                    parseExpression(()
                                      parsePrecedenceExpression((, 1, true)
                                        parseUnaryExpression((, true)
                                          parsePrimary((, expression)
                                            parseSendOrFunctionLiteral((, expression)
                                              parseSend((, expression)
                                                isNextIdentifier(()
                                                ensureIdentifier((, expression)
                                                  listener: handleIdentifier(x, expression)
                                                listener: handleNoTypeArguments())
                                                parseArgumentsOpt(x)
                                                  listener: handleNoArguments())
                                                listener: handleSend(x, ))
                                    listener: endArguments(1, (, ))
                              listener: handleSend(print, ;)
                  ensureSemicolon())
                  listener: handleExpressionStatement(;)
          notEofOrValue(}, })
          listener: endBlockFunctionBody(1, {, })
        listener: endTopLevelMethod(void, null, })
  listener: endTopLevelDeclaration(class)
  parseTopLevelDeclarationImpl(}, Instance of 'DirectiveContext')
    parseMetadataStar(})
      listener: beginMetadataStar(class)
      listener: endMetadataStar(0)
    parseTopLevelKeywordDeclaration(}, class, null, Instance of 'DirectiveContext')
      parseClassOrNamedMixinApplication(null, null, null, class)
        listener: beginClassOrMixinOrNamedMixinApplicationPrelude(class)
        ensureIdentifier(class, classOrMixinDeclaration)
          listener: handleIdentifier(Foo, classOrMixinDeclaration)
        listener: handleNoTypeVariables({)
        listener: beginClassDeclaration(class, null, null, null, Foo)
        parseClass(Foo, class, class, Foo)
          parseClassHeaderOpt(Foo, class, class)
            parseClassExtendsOpt(Foo)
              listener: handleNoType(Foo)
              listener: handleClassExtends(null, 1)
            parseClassWithClauseOpt(Foo)
              listener: handleClassNoWithClause()
            parseClassOrMixinOrEnumImplementsOpt(Foo)
              listener: handleImplements(null, 0)
            listener: handleClassHeader(class, class, null)
          parseClassOrMixinOrExtensionBody(Foo, DeclarationKind.Class, Foo)
            listener: beginClassOrMixinOrExtensionBody(DeclarationKind.Class, {)
            notEofOrValue(}, void)
            parseClassOrMixinOrExtensionOrEnumMemberImpl({, DeclarationKind.Class, Foo)
              parseMetadataStar({)
                listener: beginMetadataStar(void)
                listener: endMetadataStar(0)
              listener: beginMember()
              parseMethod({, null, null, null, null, null, null, {, Instance of 'VoidType', null, foo4, DeclarationKind.Class, Foo, false)
                listener: beginMethod(DeclarationKind.Class, null, null, null, null, null, foo4)
                listener: handleVoidKeyword(void)
                ensureIdentifierPotentiallyRecovered(void, methodDeclaration, false)
                  listener: handleIdentifier(foo4, methodDeclaration)
                parseQualifiedRestOpt(foo4, methodDeclarationContinuation)
                parseMethodTypeVar(foo4)
                  listener: handleNoTypeVariables(()
                parseGetterOrFormalParameters(foo4, foo4, false, MemberKind.NonStaticMethod)
                  parseFormalParameters(foo4, MemberKind.NonStaticMethod)
                    parseFormalParametersRest((, MemberKind.NonStaticMethod)
                      listener: beginFormalParameters((, MemberKind.NonStaticMethod)
                      parseOptionalNamedParameters((, MemberKind.NonStaticMethod)
                        listener: beginOptionalFormalParameters({)
                        parseFormalParameter({, FormalParameterKind.optionalNamed, MemberKind.NonStaticMethod)
                          parseMetadataStar({)
                            listener: beginMetadataStar(required)
                            listener: endMetadataStar(0)
                          reportRecoverableErrorWithToken(required, Instance of 'Template<(Token) => Message>')
                            listener: handleRecoverableError(Message[UnexpectedModifierInNonNnbd, The modifier 'required' is only available in null safe libraries., null, {lexeme: required}], required, required)
                          listener: beginFormalParameter(covariant, MemberKind.NonStaticMethod, required, covariant, null)
                          listener: handleIdentifier(int, typeReference)
                          listener: handleNoTypeArguments(x4)
                          listener: handleType(int, null)
                          ensureIdentifier(int, formalParameterDeclaration)
                            listener: handleIdentifier(x4, formalParameterDeclaration)
                          listener: handleFormalParameterWithoutValue(})
                          listener: endFormalParameter(null, null, null, x4, null, null, FormalParameterKind.optionalNamed, MemberKind.NonStaticMethod)
                        listener: endOptionalFormalParameters(1, {, })
                      ensureCloseParen(}, ()
                      listener: endFormalParameters(1, (, ), MemberKind.NonStaticMethod)
                parseInitializersOpt())
                  listener: handleNoInitializers()
                parseAsyncModifierOpt())
                  listener: handleAsyncModifier(null, null)
                  inPlainSync()
                inPlainSync()
                parseFunctionBody(), false, true)
                  listener: beginBlockFunctionBody({)
                  notEofOrValue(}, print)
                  parseStatement({)
                    parseStatementX({)
                      parseExpressionStatementOrDeclarationAfterModifiers({, {, null, null, null, false)
                        looksLikeLocalFunction(print)
                        parseExpressionStatement({)
                          parseExpression({)
                            parsePrecedenceExpression({, 1, true)
                              parseUnaryExpression({, true)
                                parsePrimary({, expression)
                                  parseSendOrFunctionLiteral({, expression)
                                    looksLikeFunctionBody(;)
                                    parseSend({, expression)
                                      isNextIdentifier({)
                                      ensureIdentifier({, expression)
                                        listener: handleIdentifier(print, expression)
                                      listener: handleNoTypeArguments(()
                                      parseArgumentsOpt(print)
                                        parseArguments(print)
                                          parseArgumentsRest(()
                                            listener: beginArguments(()
                                            parseExpression(()
                                              parsePrecedenceExpression((, 1, true)
                                                parseUnaryExpression((, true)
                                                  parsePrimary((, expression)
                                                    parseSendOrFunctionLiteral((, expression)
                                                      parseSend((, expression)
                                                        isNextIdentifier(()
                                                        ensureIdentifier((, expression)
                                                          listener: handleIdentifier(x, expression)
                                                        listener: handleNoTypeArguments())
                                                        parseArgumentsOpt(x)
                                                          listener: handleNoArguments())
                                                        listener: handleSend(x, ))
                                            listener: endArguments(1, (, ))
                                      listener: handleSend(print, ;)
                          ensureSemicolon())
                          listener: handleExpressionStatement(;)
                  notEofOrValue(}, })
                  listener: endBlockFunctionBody(1, {, })
                listener: endClassMethod(null, void, (, null, })
              listener: endMember()
            notEofOrValue(}, })
            listener: endClassOrMixinOrExtensionBody(DeclarationKind.Class, 1, {, })
          listener: endClassDeclaration(class, })
  listener: endTopLevelDeclaration()
  reportAllErrorTokens(void)
  listener: endCompilationUnit(4, )