|  | // Copyright 2019 The Go Authors. All rights reserved. | 
|  | // Use of this source code is governed by a BSD-style | 
|  | // license that can be found in the LICENSE file. | 
|  |  | 
|  | package lsp | 
|  |  | 
|  | import ( | 
|  | "context" | 
|  |  | 
|  | "golang.org/x/tools/internal/lsp/protocol" | 
|  | "golang.org/x/tools/internal/lsp/source" | 
|  | ) | 
|  |  | 
|  | func (s *Server) implementation(ctx context.Context, params *protocol.ImplementationParams) ([]protocol.Location, error) { | 
|  | snapshot, fh, ok, release, err := s.beginFileRequest(ctx, params.TextDocument.URI, source.Go) | 
|  | defer release() | 
|  | if !ok { | 
|  | return nil, err | 
|  | } | 
|  | return source.Implementation(ctx, snapshot, fh, params.Position) | 
|  | } |