Problems reported:

parser/general/issue_41121:10:12: The name of a constructor must match the name of the enclosing class.
  void set configuration(Configuration configuration)
           ^^^^^^^^^^^^^

parser/general/issue_41121:10:8: Constructors can't be a setter.
  void set configuration(Configuration configuration)
       ^^^

parser/general/issue_41121:10:3: Constructors can't have a return type.
  void set configuration(Configuration configuration)
  ^^^^

parser/general/issue_41121:16:21: A method declaration needs an explicit list of parameters.
  Configuration get configuration
                    ^^^^^^^^^^^^^

parser/general/issue_41121:16:21: The name of a constructor must match the name of the enclosing class.
  Configuration get configuration
                    ^^^^^^^^^^^^^

parser/general/issue_41121:16:17: Constructors can't be a getter.
  Configuration get configuration
                ^^^

parser/general/issue_41121:16:3: Constructors can't have a return type.
  Configuration get configuration
  ^^^^^^^^^^^^^

parser/general/issue_41121:23:8: The name of a constructor must match the name of the enclosing class.
  void method() : _configuration = null {
       ^^^^^^

parser/general/issue_41121:23:3: Constructors can't have a return type.
  void method() : _configuration = null {
  ^^^^

parser/general/issue_41121:27:3: The name of a constructor must match the name of the enclosing class.
  Foo() : _configuration = null {
  ^^^

beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrNamedMixinApplicationPrelude(class)
    handleIdentifier(ConfigurationService, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, ConfigurationService)
      handleNoType(ConfigurationService)
      handleClassExtends(null)
      handleClassNoWithClause()
      handleClassOrMixinImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinBody(DeclarationKind.Class, {)
        beginMetadataStar(Configuration)
        endMetadataStar(0)
        beginMember()
          handleIdentifier(Configuration, typeReference)
          handleNoTypeArguments(_configuration)
          handleType(Configuration, null)
          handleIdentifier(_configuration, fieldDeclaration)
          handleNoFieldInitializer(;)
        endClassFields(null, null, null, null, 1, Configuration, ;)
      endMember()
      beginMetadataStar(ConfigurationService)
      endMetadataStar(0)
      beginMember()
        beginMethod(null, null, null, null, null, ConfigurationService)
          handleNoType(;)
          handleIdentifier(ConfigurationService, methodDeclaration)
          handleNoTypeVariables(()
          beginFormalParameters((, MemberKind.NonStaticMethod)
            beginMetadataStar(Configuration)
            endMetadataStar(0)
            beginFormalParameter(Configuration, MemberKind.NonStaticMethod, null, null, null)
              handleIdentifier(Configuration, typeReference)
              handleNoTypeArguments(configuration)
              handleType(Configuration, null)
              handleIdentifier(configuration, formalParameterDeclaration)
              handleFormalParameterWithoutValue())
            endFormalParameter(null, null, configuration, null, null, FormalParameterKind.mandatory, MemberKind.NonStaticMethod)
          endFormalParameters(1, (, ), MemberKind.NonStaticMethod)
          beginInitializers(:)
            beginInitializer(assert)
              beginAssert(assert, Assert.Initializer)
                handleIdentifier(configuration, expression)
                handleNoTypeArguments(!=)
                handleNoArguments(!=)
                handleSend(configuration, !=)
                beginBinaryExpression(!=)
                handleLiteralNull(null)
                endBinaryExpression(!=)
              endAssert(assert, Assert.Initializer, (, null, ,)
            endInitializer(,)
            beginInitializer(_configuration)
              handleIdentifier(_configuration, expression)
              handleNoTypeArguments(=)
              handleNoArguments(=)
              handleSend(_configuration, =)
              handleIdentifier(configuration, expression)
              handleNoTypeArguments({)
              handleNoArguments({)
              handleSend(configuration, {)
              handleAssignmentExpression(=)
            endInitializer({)
          endInitializers(2, :, {)
          handleAsyncModifier(null, null)
          beginBlockFunctionBody({)
          endBlockFunctionBody(0, {, })
        endClassConstructor(null, ConfigurationService, (, :, })
      endMember()
      beginMetadataStar(void)
      endMetadataStar(0)
      beginMember()
        beginMethod(null, null, null, null, set, configuration)
          handleVoidKeyword(void)
          handleIdentifier(configuration, methodDeclaration)
          handleNoTypeVariables(()
          beginFormalParameters((, MemberKind.NonStaticMethod)
            beginMetadataStar(Configuration)
            endMetadataStar(0)
            beginFormalParameter(Configuration, MemberKind.NonStaticMethod, null, null, null)
              handleIdentifier(Configuration, typeReference)
              handleNoTypeArguments(configuration)
              handleType(Configuration, null)
              handleIdentifier(configuration, formalParameterDeclaration)
              handleFormalParameterWithoutValue())
            endFormalParameter(null, null, configuration, null, null, FormalParameterKind.mandatory, MemberKind.NonStaticMethod)
          endFormalParameters(1, (, ), MemberKind.NonStaticMethod)
          beginInitializers(:)
            beginInitializer(assert)
              beginAssert(assert, Assert.Initializer)
                handleIdentifier(configuration, expression)
                handleNoTypeArguments(!=)
                handleNoArguments(!=)
                handleSend(configuration, !=)
                beginBinaryExpression(!=)
                handleLiteralNull(null)
                endBinaryExpression(!=)
              endAssert(assert, Assert.Initializer, (, null, ,)
            endInitializer(,)
            beginInitializer(_configuration)
              handleIdentifier(_configuration, expression)
              handleNoTypeArguments(=)
              handleNoArguments(=)
              handleSend(_configuration, =)
              handleIdentifier(configuration, expression)
              handleNoTypeArguments({)
              handleNoArguments({)
              handleSend(configuration, {)
              handleAssignmentExpression(=)
            endInitializer({)
          endInitializers(2, :, {)
          handleAsyncModifier(null, null)
          beginBlockFunctionBody({)
          endBlockFunctionBody(0, {, })
          handleRecoverableError(ConstructorWithWrongName, configuration, configuration)
          handleRecoverableError(SetterConstructor, set, set)
          handleRecoverableError(ConstructorWithReturnType, void, void)
        endClassConstructor(set, void, (, :, })
      endMember()
      beginMetadataStar(Configuration)
      endMetadataStar(0)
      beginMember()
        beginMethod(null, null, null, null, get, configuration)
          handleIdentifier(Configuration, typeReference)
          handleNoTypeArguments(get)
          handleType(Configuration, null)
          handleIdentifier(configuration, methodDeclaration)
          handleNoTypeVariables(:)
          handleRecoverableError(MissingMethodParameters, configuration, configuration)
          beginFormalParameters((, MemberKind.NonStaticMethod)
          endFormalParameters(0, (, ), MemberKind.NonStaticMethod)
          beginInitializers(:)
            beginInitializer(assert)
              beginAssert(assert, Assert.Initializer)
                handleIdentifier(_configuration, expression)
                handleNoTypeArguments(!=)
                handleNoArguments(!=)
                handleSend(_configuration, !=)
                beginBinaryExpression(!=)
                handleLiteralNull(null)
                endBinaryExpression(!=)
              endAssert(assert, Assert.Initializer, (, null, ,)
            endInitializer(,)
            beginInitializer(_configuration)
              handleIdentifier(_configuration, expression)
              handleNoTypeArguments(=)
              handleNoArguments(=)
              handleSend(_configuration, =)
              handleIdentifier(_configuration, expression)
              handleNoTypeArguments(.)
              handleNoArguments(.)
              handleSend(_configuration, .)
              handleIdentifier(foo, expressionContinuation)
              handleNoTypeArguments({)
              handleNoArguments({)
              handleSend(foo, {)
              endBinaryExpression(.)
              handleAssignmentExpression(=)
            endInitializer({)
          endInitializers(2, :, {)
          handleAsyncModifier(null, null)
          beginBlockFunctionBody({)
            beginReturnStatement(return)
              handleIdentifier(_configuration, expression)
              handleNoTypeArguments(;)
              handleNoArguments(;)
              handleSend(_configuration, ;)
            endReturnStatement(true, return, ;)
          endBlockFunctionBody(1, {, })
          handleRecoverableError(ConstructorWithWrongName, configuration, configuration)
          handleRecoverableError(GetterConstructor, get, get)
          handleRecoverableError(ConstructorWithReturnType, Configuration, Configuration)
        endClassConstructor(get, Configuration, (, :, })
      endMember()
      beginMetadataStar(void)
      endMetadataStar(0)
      beginMember()
        beginMethod(null, null, null, null, null, method)
          handleVoidKeyword(void)
          handleIdentifier(method, methodDeclaration)
          handleNoTypeVariables(()
          beginFormalParameters((, MemberKind.NonStaticMethod)
          endFormalParameters(0, (, ), MemberKind.NonStaticMethod)
          beginInitializers(:)
            beginInitializer(_configuration)
              handleIdentifier(_configuration, expression)
              handleNoTypeArguments(=)
              handleNoArguments(=)
              handleSend(_configuration, =)
              handleLiteralNull(null)
              handleAssignmentExpression(=)
            endInitializer({)
          endInitializers(1, :, {)
          handleAsyncModifier(null, null)
          beginBlockFunctionBody({)
          endBlockFunctionBody(0, {, })
          handleRecoverableError(ConstructorWithWrongName, method, method)
          handleRecoverableError(ConstructorWithReturnType, void, void)
        endClassConstructor(null, void, (, :, })
      endMember()
      beginMetadataStar(Foo)
      endMetadataStar(0)
      beginMember()
        beginMethod(null, null, null, null, null, Foo)
          handleNoType(})
          handleIdentifier(Foo, methodDeclaration)
          handleNoTypeVariables(()
          beginFormalParameters((, MemberKind.NonStaticMethod)
          endFormalParameters(0, (, ), MemberKind.NonStaticMethod)
          beginInitializers(:)
            beginInitializer(_configuration)
              handleIdentifier(_configuration, expression)
              handleNoTypeArguments(=)
              handleNoArguments(=)
              handleSend(_configuration, =)
              handleLiteralNull(null)
              handleAssignmentExpression(=)
            endInitializer({)
          endInitializers(1, :, {)
          handleAsyncModifier(null, null)
          beginBlockFunctionBody({)
          endBlockFunctionBody(0, {, })
          handleRecoverableError(ConstructorWithWrongName, Foo, Foo)
        endClassConstructor(null, Foo, (, :, })
      endMember()
    endClassOrMixinBody(DeclarationKind.Class, 6, {, })
  endClassDeclaration(class, })
endTopLevelDeclaration(class)
beginMetadataStar(class)
endMetadataStar(0)
beginClassOrNamedMixinApplicationPrelude(class)
  handleIdentifier(Configuration, classOrMixinDeclaration)
  handleNoTypeVariables({)
  beginClassDeclaration(class, null, Configuration)
    handleNoType(Configuration)
    handleClassExtends(null)
    handleClassNoWithClause()
    handleClassOrMixinImplements(null, 0)
    handleClassHeader(class, class, null)
    beginClassOrMixinBody(DeclarationKind.Class, {)
      beginMetadataStar(Configuration)
      endMetadataStar(0)
      beginMember()
        beginMethod(null, null, null, null, get, foo)
          handleIdentifier(Configuration, typeReference)
          handleNoTypeArguments(get)
          handleType(Configuration, null)
          handleIdentifier(foo, methodDeclaration)
          handleNoTypeVariables(=>)
          handleNoFormalParameters(=>, MemberKind.NonStaticMethod)
          handleNoInitializers()
          handleAsyncModifier(null, null)
          handleThisExpression(this, expression)
          handleExpressionFunctionBody(=>, ;)
        endClassMethod(get, Configuration, =>, null, ;)
      endMember()
    endClassOrMixinBody(DeclarationKind.Class, 1, {, })
  endClassDeclaration(class, })
endTopLevelDeclaration()
endCompilationUnit(2, )