Problems reported:

parser/error_recovery/issue_46505_prime_1.crash:2:15: Expected a type, but got '>>'.
  Stream<List<>> x() {}
              ^^

beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrMixinOrNamedMixinApplicationPrelude(class)
    handleIdentifier(A, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, null, null, A)
      handleNoType(A)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinOrExtensionBody(DeclarationKind.Class, {)
        beginMetadataStar(Stream)
        endMetadataStar(0)
        beginMember()
          beginMethod(DeclarationKind.Class, null, null, null, null, null, null, x)
            handleIdentifier(Stream, typeReference)
            beginTypeArguments(<)
              handleIdentifier(List, typeReference)
              beginTypeArguments(<)
                handleRecoverableError(Message[ExpectedType, Expected a type, but got '>>'., null, {lexeme: >>}], >>, >>)
                handleIdentifier(, typeReference)
                handleNoTypeArguments(>>)
                handleType(, null)
              endTypeArguments(1, <, >)
              handleType(List, null)
            endTypeArguments(1, <, >)
            handleType(Stream, null)
            handleIdentifier(x, methodDeclaration)
            handleNoTypeVariables(()
            beginFormalParameters((, MemberKind.NonStaticMethod)
            endFormalParameters(0, (, ), MemberKind.NonStaticMethod)
            handleNoInitializers()
            handleAsyncModifier(null, null)
            beginBlockFunctionBody({)
            endBlockFunctionBody(0, {, })
          endClassMethod(null, Stream, (, null, })
        endMember()
      endClassOrMixinOrExtensionBody(DeclarationKind.Class, 1, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration()
endCompilationUnit(1, )