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: file_cache.go
    path of file: ./repos/sliver/vendor/github.com/tetratelabs/wazero/internal/filecache
    
    the code of the file until where you have to start completion: package filecache

import (
	"encoding/hex"
	"error
    
func (fc *fileCache) Delete(key Key) (err error) {
	// TODO: take lock per key for more efficiency vs the complexity of impl.
	fc.mux.Lock()
	defer fc.mux.Unlock()

	err = os.Remove(fc.path(key))
	if errors.Is(err, os.ErrNotExist) {
		err = nil
	}
	return
}