Problems reported:

parser/error_recovery/issue_42229_prime_3.crash:1:8: Expected '>' after this.
Stream<List<x>> 
       ^^^^

parser/error_recovery/issue_42229_prime_3.crash:1:1: A function declaration needs an explicit list of parameters.
Stream<List<x>> 
^^^^^^

parser/error_recovery/issue_42229_prime_3.crash:1:17: Expected a function body, but got ''.
Stream<List<x>> 
                ^...

beginCompilationUnit(Stream)
  beginMetadataStar(Stream)
  endMetadataStar(0)
  beginTopLevelMember(Stream)
    beginTopLevelMethod(, null)
      handleNoType()
      handleIdentifier(Stream, topLevelFunctionDeclaration)
      beginTypeVariables(<)
        beginMetadataStar(List)
        endMetadataStar(0)
        handleIdentifier(List, typeVariableDeclaration)
        beginTypeVariable(List)
          handleTypeVariablesDefined(List, 1)
          handleNoType(List)
        endTypeVariable(<, 0, null, null)
        handleRecoverableError(Message[ExpectedAfterButGot, Expected '>' after this., null, {string: >}], List, List)
      endTypeVariables(<, >)
      handleRecoverableError(MissingFunctionParameters, Stream, Stream)
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      handleRecoverableError(Message[ExpectedFunctionBody, Expected a function body, but got ''., null, {token: }], , )
      handleInvalidFunctionBody({)
    endTopLevelMethod(Stream, null, })
  endTopLevelDeclaration()
endCompilationUnit(1, )