how to handle function call in stream scene

[OldRiverChen]

how to handle function call in stream scene?

[sheldondz]

This currently only works with non stream version, could not get it to work with stream.

req := openai.ChatCompletionRequest{
	Model: openai.GPT3Dot5Turbo0613,
	Messages: []openai.ChatCompletionMessage {
	{
				Role:    openai.ChatMessageRoleUser,
				Content: promptContext,
			},
	},
	Stream: false,
	Functions: []openai.FunctionDefinition{
	{
			Name:       "set_key_features",
			Parameters: ai.generateSchema(),
		},
	},
	FunctionCall: rest.Map{"name": "set_key_features"},
}

[ttdias25]

How to do it without stream? where does the package "rest" comes from? 
I want to enforce JSON response but couldn't find an example of the Function and FunctionCall