Problems reported:

parser/general/issue_49197:1:27: Can't use 'Function' as a name here.
import "Function.dart" as Function;
                          ^^^^^^^^

beginCompilationUnit(import)
  beginMetadataStar(import)
  endMetadataStar(0)
  beginUncategorizedTopLevelDeclaration(import)
    beginImport(import)
      beginLiteralString("Function.dart")
      endLiteralString(0, as)
      beginConditionalUris(as)
      endConditionalUris(0)
      handleRecoverableError(Message[BuiltInIdentifierInDeclaration, Can't use 'Function' as a name here., null, {lexeme: Function}], Function, Function)
      handleIdentifier(Function, importPrefixDeclaration)
      handleImportPrefix(null, as)
      beginCombinators(;)
      endCombinators(0)
    endImport(import, null, ;)
  endTopLevelDeclaration()
endCompilationUnit(1, )