1 files changed, 21 insertions, 0 deletions
diff --git a/gopls/internal/lsp/implementation.go b/gopls/internal/lsp/implementation.go
new file mode 100644
index 000000000..0eb82652e
--- /dev/null
+++ b/gopls/internal/lsp/implementation.go
@@ -0,0 +1,21 @@
+// 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/gopls/internal/lsp/protocol"
+	"golang.org/x/tools/gopls/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)
+}