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diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/ast/astutil/enclosing_test.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/ast/astutil/enclosing_test.go
new file mode 100644
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--- /dev/null
+++ b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/ast/astutil/enclosing_test.go
@@ -0,0 +1,195 @@
+// Copyright 2013 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 astutil_test
+
+// This file defines tests of PathEnclosingInterval.
+
+// TODO(adonovan): exhaustive tests that run over the whole input
+// tree, not just handcrafted examples.
+
+import (
+	"bytes"
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"strings"
+	"testing"
+
+	"golang.org/x/tools/go/ast/astutil"
+)
+
+// pathToString returns a string containing the concrete types of the
+// nodes in path.
+func pathToString(path []ast.Node) string {
+	var buf bytes.Buffer
+	fmt.Fprint(&buf, "[")
+	for i, n := range path {
+		if i > 0 {
+			fmt.Fprint(&buf, " ")
+		}
+		fmt.Fprint(&buf, strings.TrimPrefix(fmt.Sprintf("%T", n), "*ast."))
+	}
+	fmt.Fprint(&buf, "]")
+	return buf.String()
+}
+
+// findInterval parses input and returns the [start, end) positions of
+// the first occurrence of substr in input.  f==nil indicates failure;
+// an error has already been reported in that case.
+//
+func findInterval(t *testing.T, fset *token.FileSet, input, substr string) (f *ast.File, start, end token.Pos) {
+	f, err := parser.ParseFile(fset, "<input>", input, 0)
+	if err != nil {
+		t.Errorf("parse error: %s", err)
+		return
+	}
+
+	i := strings.Index(input, substr)
+	if i < 0 {
+		t.Errorf("%q is not a substring of input", substr)
+		f = nil
+		return
+	}
+
+	filePos := fset.File(f.Package)
+	return f, filePos.Pos(i), filePos.Pos(i + len(substr))
+}
+
+// Common input for following tests.
+const input = `
+// Hello.
+package main
+import "fmt"
+func f() {}
+func main() {
+	z := (x + y) // add them
+        f() // NB: ExprStmt and its CallExpr have same Pos/End
+}
+`
+
+func TestPathEnclosingInterval_Exact(t *testing.T) {
+	// For the exact tests, we check that a substring is mapped to
+	// the canonical string for the node it denotes.
+	tests := []struct {
+		substr string // first occurrence of this string indicates interval
+		node   string // complete text of expected containing node
+	}{
+		{"package",
+			input[11 : len(input)-1]},
+		{"\npack",
+			input[11 : len(input)-1]},
+		{"main",
+			"main"},
+		{"import",
+			"import \"fmt\""},
+		{"\"fmt\"",
+			"\"fmt\""},
+		{"\nfunc f() {}\n",
+			"func f() {}"},
+		{"x ",
+			"x"},
+		{" y",
+			"y"},
+		{"z",
+			"z"},
+		{" + ",
+			"x + y"},
+		{" :=",
+			"z := (x + y)"},
+		{"x + y",
+			"x + y"},
+		{"(x + y)",
+			"(x + y)"},
+		{" (x + y) ",
+			"(x + y)"},
+		{" (x + y) // add",
+			"(x + y)"},
+		{"func",
+			"func f() {}"},
+		{"func f() {}",
+			"func f() {}"},
+		{"\nfun",
+			"func f() {}"},
+		{" f",
+			"f"},
+	}
+	for _, test := range tests {
+		f, start, end := findInterval(t, new(token.FileSet), input, test.substr)
+		if f == nil {
+			continue
+		}
+
+		path, exact := astutil.PathEnclosingInterval(f, start, end)
+		if !exact {
+			t.Errorf("PathEnclosingInterval(%q) not exact", test.substr)
+			continue
+		}
+
+		if len(path) == 0 {
+			if test.node != "" {
+				t.Errorf("PathEnclosingInterval(%q).path: got [], want %q",
+					test.substr, test.node)
+			}
+			continue
+		}
+
+		if got := input[path[0].Pos():path[0].End()]; got != test.node {
+			t.Errorf("PathEnclosingInterval(%q): got %q, want %q (path was %s)",
+				test.substr, got, test.node, pathToString(path))
+			continue
+		}
+	}
+}
+
+func TestPathEnclosingInterval_Paths(t *testing.T) {
+	// For these tests, we check only the path of the enclosing
+	// node, but not its complete text because it's often quite
+	// large when !exact.
+	tests := []struct {
+		substr string // first occurrence of this string indicates interval
+		path   string // the pathToString(),exact of the expected path
+	}{
+		{"// add",
+			"[BlockStmt FuncDecl File],false"},
+		{"(x + y",
+			"[ParenExpr AssignStmt BlockStmt FuncDecl File],false"},
+		{"x +",
+			"[BinaryExpr ParenExpr AssignStmt BlockStmt FuncDecl File],false"},
+		{"z := (x",
+			"[AssignStmt BlockStmt FuncDecl File],false"},
+		{"func f",
+			"[FuncDecl File],false"},
+		{"func f()",
+			"[FuncDecl File],false"},
+		{" f()",
+			"[FuncDecl File],false"},
+		{"() {}",
+			"[FuncDecl File],false"},
+		{"// Hello",
+			"[File],false"},
+		{" f",
+			"[Ident FuncDecl File],true"},
+		{"func ",
+			"[FuncDecl File],true"},
+		{"mai",
+			"[Ident File],true"},
+		{"f() // NB",
+			"[CallExpr ExprStmt BlockStmt FuncDecl File],true"},
+	}
+	for _, test := range tests {
+		f, start, end := findInterval(t, new(token.FileSet), input, test.substr)
+		if f == nil {
+			continue
+		}
+
+		path, exact := astutil.PathEnclosingInterval(f, start, end)
+		if got := fmt.Sprintf("%s,%v", pathToString(path), exact); got != test.path {
+			t.Errorf("PathEnclosingInterval(%q): got %q, want %q",
+				test.substr, got, test.path)
+			continue
+		}
+	}
+}