You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: template.go
    path of file: ./repos/faasd/vendor/github.com/compose-spec/compose-go/template
    
    the code of the file until where you have to start completion: /*
   Copyright 2020 The Compose Specification Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the Lic
    
func recurseExtract(value interface{}, pattern *regexp.Regexp) map[string]Variable {
	m := map[string]Variable{}

	switch value := value.(type) {
	case string:
		if values, is := extractVariable(value, pattern); is {
			for _, v := range values {
				m[v.Name] = v
			}
		}
	case map[string]interface{}:
		for _, elem := range value {
			submap := recurseExtract(elem, pattern)
			for key, value := range submap {
				m[key] = value
			}
		}

	case []interface{}:
		for _, elem := range value {
			if values, is := extractVariable(elem, pattern); is {
				for _, v := range values {
					m[v.Name] = v
				}
			}
		}
	}

	return m
}