Program: 52965
Project: 52965
Buggy source:
@Override public <A extends Arg,U>Optional<U> createMetadata(BuildTarget buildTarget,BuildRuleResolver resolver,A args,Optional<ImmutableMap<BuildTarget,Version>> selectedVersions,Class<U> metadataClass) throws NoSuchBuildTargetException {
  Map.Entry<Flavor,MetadataType> type=METADATA_TYPE.getFlavorAndValue(buildTarget).orElseThrow(IllegalArgumentException::new);
  BuildTarget baseTarget=buildTarget.withoutFlavors(type.getKey());
switch (type.getValue()) {
case PACKAGE_COMPONENTS:
{
      Map.Entry<Flavor,PythonPlatform> pythonPlatform=pythonPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
      Map.Entry<Flavor,CxxPlatform> cxxPlatform=cxxPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
      baseTarget=buildTarget.withoutFlavors(pythonPlatform.getKey(),cxxPlatform.getKey());
      SourcePathRuleFinder ruleFinder=new SourcePathRuleFinder(resolver);
      SourcePathResolver pathResolver=new SourcePathResolver(ruleFinder);
      Path baseModule=PythonUtil.getBasePath(baseTarget,args.baseModule);
      PythonPackageComponents components=PythonPackageComponents.of(PythonUtil.getModules(baseTarget,resolver,ruleFinder,pathResolver,pythonPlatform.getValue(),cxxPlatform.getValue(),"String_Node_Str",baseModule,args.srcs,args.platformSrcs,args.versionedSrcs,selectedVersions),PythonUtil.getModules(baseTarget,resolver,ruleFinder,pathResolver,pythonPlatform.getValue(),cxxPlatform.getValue(),"String_Node_Str",baseModule,args.resources,args.platformResources,args.versionedResources,selectedVersions),ImmutableMap.of(),ImmutableSet.of(),args.zipSafe);
      return Optional.of(components).map(metadataClass::cast);
    }
case PACKAGE_DEPS:
{
    Map.Entry<Flavor,PythonPlatform> pythonPlatform=pythonPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
    Map.Entry<Flavor,CxxPlatform> cxxPlatform=cxxPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
    baseTarget=buildTarget.withoutFlavors(pythonPlatform.getKey(),cxxPlatform.getKey());
    ImmutableList<BuildTarget> depTargets=PythonUtil.getDeps(pythonPlatform.getValue(),cxxPlatform.getValue(),args.deps,args.platformDeps);
    return Optional.of(resolver.getAllRules(depTargets)).map(metadataClass::cast);
  }
}
throw new IllegalStateException();
}

Fixed version (ground truth):
@Override public <A extends Arg,U>Optional<U> createMetadata(BuildTarget buildTarget,BuildRuleResolver resolver,A args,Optional<ImmutableMap<BuildTarget,Version>> selectedVersions,Class<U> metadataClass) throws NoSuchBuildTargetException {
  Optional<Map.Entry<Flavor,MetadataType>> optionalType=METADATA_TYPE.getFlavorAndValue(buildTarget);
  if (!optionalType.isPresent()) {
    return Optional.empty();
  }
  Map.Entry<Flavor,MetadataType> type=optionalType.get();
  BuildTarget baseTarget=buildTarget.withoutFlavors(type.getKey());
switch (type.getValue()) {
case PACKAGE_COMPONENTS:
{
      Map.Entry<Flavor,PythonPlatform> pythonPlatform=pythonPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
      Map.Entry<Flavor,CxxPlatform> cxxPlatform=cxxPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
      baseTarget=buildTarget.withoutFlavors(pythonPlatform.getKey(),cxxPlatform.getKey());
      SourcePathRuleFinder ruleFinder=new SourcePathRuleFinder(resolver);
      SourcePathResolver pathResolver=new SourcePathResolver(ruleFinder);
      Path baseModule=PythonUtil.getBasePath(baseTarget,args.baseModule);
      PythonPackageComponents components=PythonPackageComponents.of(PythonUtil.getModules(baseTarget,resolver,ruleFinder,pathResolver,pythonPlatform.getValue(),cxxPlatform.getValue(),"String_Node_Str",baseModule,args.srcs,args.platformSrcs,args.versionedSrcs,selectedVersions),PythonUtil.getModules(baseTarget,resolver,ruleFinder,pathResolver,pythonPlatform.getValue(),cxxPlatform.getValue(),"String_Node_Str",baseModule,args.resources,args.platformResources,args.versionedResources,selectedVersions),ImmutableMap.of(),ImmutableSet.of(),args.zipSafe);
      return Optional.of(components).map(metadataClass::cast);
    }
case PACKAGE_DEPS:
{
    Map.Entry<Flavor,PythonPlatform> pythonPlatform=pythonPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
    Map.Entry<Flavor,CxxPlatform> cxxPlatform=cxxPlatforms.getFlavorAndValue(baseTarget).orElseThrow(IllegalArgumentException::new);
    baseTarget=buildTarget.withoutFlavors(pythonPlatform.getKey(),cxxPlatform.getKey());
    ImmutableList<BuildTarget> depTargets=PythonUtil.getDeps(pythonPlatform.getValue(),cxxPlatform.getValue(),args.deps,args.platformDeps);
    return Optional.of(resolver.getAllRules(depTargets)).map(metadataClass::cast);
  }
}
throw new IllegalStateException();
}