Problems reported:

parser/no-triple-shift/define_triple_shift_method:2:16: This requires the 'triple-shift' language feature to be enabled.
  Foo operator >>>(_) => this;
               ^^^

parser/no-triple-shift/define_triple_shift_method:7:7: This requires the 'triple-shift' language feature to be enabled.
  foo >>> 42;
      ^^^

parser/no-triple-shift/define_triple_shift_method:8:13: This requires the 'triple-shift' language feature to be enabled.
  print(foo >>> 42);
            ^^^

parser/no-triple-shift/define_triple_shift_method:9:13: This requires the 'triple-shift' language feature to be enabled.
  print(foo >>>= 42);
            ^^^^

parser/no-triple-shift/define_triple_shift_method:10:12: This requires the 'triple-shift' language feature to be enabled.
  if ((foo >>>= 42) == foo) {
           ^^^^

beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrMixinOrNamedMixinApplicationPrelude(class)
    handleIdentifier(Foo, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, null, null, Foo)
      handleNoType(Foo)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinOrExtensionBody(DeclarationKind.Class, {)
        beginMetadataStar(Foo)
        endMetadataStar(0)
        beginMember()
          handleRecoverableError(Message[ExperimentNotEnabled, This requires the 'triple-shift' language feature to be enabled., Try updating your pubspec.yaml to set the minimum SDK constraint to 2.14 or higher, and running 'pub get'., {string: triple-shift, string2: 2.14}], >>, >)
          beginMethod(DeclarationKind.Class, null, null, null, null, null, null, operator)
            handleIdentifier(Foo, typeReference)
            handleNoTypeArguments(operator)
            handleType(Foo, null)
            handleOperatorName(operator, >>>)
            handleNoTypeVariables(()
            beginFormalParameters((, MemberKind.NonStaticMethod)
              beginMetadataStar(_)
              endMetadataStar(0)
              beginFormalParameter(_, MemberKind.NonStaticMethod, null, null, null)
                handleNoType(()
                handleIdentifier(_, formalParameterDeclaration)
                handleFormalParameterWithoutValue())
              endFormalParameter(null, null, null, _, null, null, FormalParameterKind.mandatory, MemberKind.NonStaticMethod)
            endFormalParameters(1, (, ), MemberKind.NonStaticMethod)
            handleNoInitializers()
            handleAsyncModifier(null, null)
            handleThisExpression(this, expression)
            handleExpressionFunctionBody(=>, ;)
          endClassMethod(null, Foo, (, null, ;)
        endMember()
      endClassOrMixinOrExtensionBody(DeclarationKind.Class, 1, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration(main)
  beginMetadataStar(main)
  endMetadataStar(0)
  beginTopLevelMember(main)
    beginTopLevelMethod(}, null, null)
      handleNoType(})
      handleIdentifier(main, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginBlockFunctionBody({)
        beginMetadataStar(Foo)
        endMetadataStar(0)
        handleIdentifier(Foo, typeReference)
        handleNoTypeArguments(foo)
        handleType(Foo, null)
        beginVariablesDeclaration(foo, null, null)
          handleIdentifier(foo, localVariableDeclaration)
          beginInitializedIdentifier(foo)
            beginVariableInitializer(=)
              beginNewExpression(new)
                handleIdentifier(Foo, constructorReference)
                beginConstructorReference(Foo)
                  handleNoTypeArguments(()
                  handleNoConstructorReferenceContinuationAfterTypeArguments(()
                endConstructorReference(Foo, null, (, ConstructorReferenceContext.New)
                beginArguments(()
                endArguments(0, (, ))
              endNewExpression(new)
            endVariableInitializer(=)
          endInitializedIdentifier(foo)
        endVariablesDeclaration(1, ;)
        handleIdentifier(foo, expression)
        handleNoTypeArguments(>>)
        handleNoArguments(>>)
        handleSend(foo, >>)
        handleRecoverableError(Message[ExperimentNotEnabled, This requires the 'triple-shift' language feature to be enabled., Try updating your pubspec.yaml to set the minimum SDK constraint to 2.14 or higher, and running 'pub get'., {string: triple-shift, string2: 2.14}], >>, >)
        beginBinaryExpression(>>>)
          handleLiteralInt(42)
        endBinaryExpression(>>>)
        handleExpressionStatement(;)
        handleIdentifier(print, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(foo, expression)
          handleNoTypeArguments(>>)
          handleNoArguments(>>)
          handleSend(foo, >>)
          handleRecoverableError(Message[ExperimentNotEnabled, This requires the 'triple-shift' language feature to be enabled., Try updating your pubspec.yaml to set the minimum SDK constraint to 2.14 or higher, and running 'pub get'., {string: triple-shift, string2: 2.14}], >>, >)
          beginBinaryExpression(>>>)
            handleLiteralInt(42)
          endBinaryExpression(>>>)
        endArguments(1, (, ))
        handleSend(print, ;)
        handleExpressionStatement(;)
        handleIdentifier(print, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(foo, expression)
          handleNoTypeArguments(>>)
          handleNoArguments(>>)
          handleSend(foo, >>)
          handleRecoverableError(Message[ExperimentNotEnabled, This requires the 'triple-shift' language feature to be enabled., Try updating your pubspec.yaml to set the minimum SDK constraint to 2.14 or higher, and running 'pub get'., {string: triple-shift, string2: 2.14}], >>, >=)
          handleLiteralInt(42)
          handleAssignmentExpression(>>>=)
        endArguments(1, (, ))
        handleSend(print, ;)
        handleExpressionStatement(;)
        beginIfStatement(if)
          handleIdentifier(foo, expression)
          handleNoTypeArguments(>>)
          handleNoArguments(>>)
          handleSend(foo, >>)
          handleRecoverableError(Message[ExperimentNotEnabled, This requires the 'triple-shift' language feature to be enabled., Try updating your pubspec.yaml to set the minimum SDK constraint to 2.14 or higher, and running 'pub get'., {string: triple-shift, string2: 2.14}], >>, >=)
          handleLiteralInt(42)
          handleAssignmentExpression(>>>=)
          handleParenthesizedExpression(()
          beginBinaryExpression(==)
            handleIdentifier(foo, expression)
            handleNoTypeArguments())
            handleNoArguments())
            handleSend(foo, ))
          endBinaryExpression(==)
          handleParenthesizedCondition(()
          beginThenStatement({)
            beginBlock({, BlockKind(statement))
              handleIdentifier(print, expression)
              handleNoTypeArguments(()
              beginArguments(()
                beginLiteralString("same")
                endLiteralString(0, ))
              endArguments(1, (, ))
              handleSend(print, ;)
              handleExpressionStatement(;)
            endBlock(1, {, }, BlockKind(statement))
          endThenStatement(})
        endIfStatement(if, null)
      endBlockFunctionBody(5, {, })
    endTopLevelMethod(main, null, })
  endTopLevelDeclaration()
endCompilationUnit(2, )