Problems reported:

parser/general/operator_hat_class.crash:1:7: Can't use 'operator' as a name here.
class operator {
      ^^^^^^^^

beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrNamedMixinApplicationPrelude(class)
    handleRecoverableError(Message[BuiltInIdentifierInDeclaration, Can't use 'operator' as a name here., null, {token: operator}], operator, operator)
    handleIdentifier(operator, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, operator)
      handleNoType(operator)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleClassOrMixinImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinBody(DeclarationKind.Class, {)
        beginMetadataStar(operator)
        endMetadataStar(0)
        beginMember()
          beginMethod(null, null, null, null, null, operator)
            handleNoType({)
            handleOperatorName(operator, ^)
            handleNoTypeVariables(()
            beginFormalParameters((, MemberKind.NonStaticMethod)
              beginMetadataStar(int)
              endMetadataStar(0)
              beginFormalParameter(int, MemberKind.NonStaticMethod, null, null, null)
                handleIdentifier(int, typeReference)
                handleNoTypeArguments(x)
                handleType(int, null)
                handleIdentifier(x, formalParameterDeclaration)
                handleFormalParameterWithoutValue())
              endFormalParameter(null, null, x, null, null, FormalParameterKind.mandatory, MemberKind.NonStaticMethod)
            endFormalParameters(1, (, ), MemberKind.NonStaticMethod)
            handleNoInitializers()
            handleAsyncModifier(null, null)
            beginBlockFunctionBody({)
            endBlockFunctionBody(0, {, })
          endClassConstructor(null, operator, (, null, })
        endMember()
      endClassOrMixinBody(DeclarationKind.Class, 1, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration()
endCompilationUnit(1, )