go.mod: vendor golangci-lint

6 files changed, 837 insertions, 0 deletions

diff --git a/vendor/github.com/go-toolsmith/astequal/.gitignore b/vendor/github.com/go-toolsmith/astequal/.gitignore
new file mode 100644
index 000000000..f38c2b852
--- /dev/null
+++ b/vendor/github.com/go-toolsmith/astequal/.gitignore
@@ -0,0 +1,5 @@
+bin
+pkg
+src/main
+tmp
+
diff --git a/vendor/github.com/go-toolsmith/astequal/.travis.yml b/vendor/github.com/go-toolsmith/astequal/.travis.yml
new file mode 100644
index 000000000..8994d395c
--- /dev/null
+++ b/vendor/github.com/go-toolsmith/astequal/.travis.yml
@@ -0,0 +1,9 @@
+language: go
+go:
+  - 1.x
+install:
+  - # Prevent default install action "go get -t -v ./...".
+script:
+  - go get -t -v ./...
+  - go tool vet .
+  - go test -v -race ./...
\ No newline at end of file
diff --git a/vendor/github.com/go-toolsmith/astequal/LICENSE b/vendor/github.com/go-toolsmith/astequal/LICENSE
new file mode 100644
index 000000000..717f894f5
--- /dev/null
+++ b/vendor/github.com/go-toolsmith/astequal/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 Iskander Sharipov / Quasilyte
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/go-toolsmith/astequal/README.md b/vendor/github.com/go-toolsmith/astequal/README.md
new file mode 100644
index 000000000..b14f80f6f
--- /dev/null
+++ b/vendor/github.com/go-toolsmith/astequal/README.md
@@ -0,0 +1,67 @@
+[![Go Report Card](https://goreportcard.com/badge/github.com/go-toolsmith/astequal)](https://goreportcard.com/report/github.com/go-toolsmith/astequal)
+[![GoDoc](https://godoc.org/github.com/go-toolsmith/astequal?status.svg)](https://godoc.org/github.com/go-toolsmith/astequal)
+[![Build Status](https://travis-ci.org/go-toolsmith/astequal.svg?branch=master)](https://travis-ci.org/go-toolsmith/astequal)
+
+
+# astequal
+
+Package astequal provides AST (deep) equallity check operations.
+
+## Installation:
+
+```bash
+go get github.com/go-toolsmith/astequal
+```
+
+## Example
+
+```go
+package main
+
+import (
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"log"
+	"reflect"
+
+	"github.com/go-toolsmith/astequal"
+)
+
+func main() {
+	const code = `
+		package foo
+
+		func main() {
+			x := []int{1, 2, 3}
+			x := []int{1, 2, 3}
+		}`
+
+	fset := token.NewFileSet()
+	pkg, err := parser.ParseFile(fset, "string", code, 0)
+	if err != nil {
+		log.Fatalf("parse error: %+v", err)
+	}
+
+	fn := pkg.Decls[0].(*ast.FuncDecl)
+	x := fn.Body.List[0]
+	y := fn.Body.List[1]
+
+	// Reflect DeepEqual will fail due to different Pos values.
+	// astequal only checks whether two nodes describe AST.
+	fmt.Println(reflect.DeepEqual(x, y)) // => false
+	fmt.Println(astequal.Node(x, y))     // => true
+	fmt.Println(astequal.Stmt(x, y))     // => true
+}
+```
+
+## Performance
+
+`astequal` outperforms reflection-based comparison by a big margin:
+
+```
+BenchmarkEqualExpr/astequal.Expr-8       5000000     298 ns/op       0 B/op   0 allocs/op
+BenchmarkEqualExpr/astequal.Node-8       3000000     409 ns/op       0 B/op   0 allocs/op
+BenchmarkEqualExpr/reflect.DeepEqual-8     50000   38898 ns/op   10185 B/op   156 allocs/op
+```
diff --git a/vendor/github.com/go-toolsmith/astequal/astequal.go b/vendor/github.com/go-toolsmith/astequal/astequal.go
new file mode 100644
index 000000000..6a32d7218
--- /dev/null
+++ b/vendor/github.com/go-toolsmith/astequal/astequal.go
@@ -0,0 +1,734 @@
+// Package astequal provides AST (deep) equallity check operations.
+package astequal
+
+import (
+	"go/ast"
+	"go/token"
+)
+
+// Node reports whether two AST nodes are structurally (deep) equal.
+//
+// Nil arguments are permitted: true is returned if x and y are both nils.
+//
+// See also: Expr, Stmt, Decl functions.
+func Node(x, y ast.Node) bool {
+	return astNodeEq(x, y)
+}
+
+// Expr reports whether two AST expressions are structurally (deep) equal.
+//
+// Nil arguments are permitted: true is returned if x and y are both nils.
+// ast.BadExpr comparison always yields false.
+func Expr(x, y ast.Expr) bool {
+	return astExprEq(x, y)
+}
+
+// Stmt reports whether two AST statements are structurally (deep) equal.
+//
+// Nil arguments are permitted: true is returned if x and y are both nils.
+// ast.BadStmt comparison always yields false.
+func Stmt(x, y ast.Stmt) bool {
+	return astStmtEq(x, y)
+}
+
+// Decl reports whether two AST declarations are structurally (deep) equal.
+//
+// Nil arguments are permitted: true is returned if x and y are both nils.
+// ast.BadDecl comparison always yields false.
+func Decl(x, y ast.Decl) bool {
+	return astDeclEq(x, y)
+}
+
+// Functions to perform deep equallity checks between arbitrary AST nodes.
+
+// Compare interface node types.
+//
+// Interfaces, as well as their values, can be nil.
+//
+// Even if AST does expect field X to be mandatory,
+// nil checks are required as nodes can be constructed
+// manually, or be partially invalid/incomplete.
+
+func astNodeEq(x, y ast.Node) bool {
+	switch x := x.(type) {
+	case ast.Expr:
+		y, ok := y.(ast.Expr)
+		return ok && astExprEq(x, y)
+	case ast.Stmt:
+		y, ok := y.(ast.Stmt)
+		return ok && astStmtEq(x, y)
+	case ast.Decl:
+		y, ok := y.(ast.Decl)
+		return ok && astDeclEq(x, y)
+	default:
+		return false
+	}
+}
+
+func astExprEq(x, y ast.Expr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+
+	switch x := x.(type) {
+	case *ast.Ident:
+		y, ok := y.(*ast.Ident)
+		return ok && astIdentEq(x, y)
+
+	case *ast.BasicLit:
+		y, ok := y.(*ast.BasicLit)
+		return ok && astBasicLitEq(x, y)
+
+	case *ast.FuncLit:
+		y, ok := y.(*ast.FuncLit)
+		return ok && astFuncLitEq(x, y)
+
+	case *ast.CompositeLit:
+		y, ok := y.(*ast.CompositeLit)
+		return ok && astCompositeLitEq(x, y)
+
+	case *ast.ParenExpr:
+		y, ok := y.(*ast.ParenExpr)
+		return ok && astParenExprEq(x, y)
+
+	case *ast.SelectorExpr:
+		y, ok := y.(*ast.SelectorExpr)
+		return ok && astSelectorExprEq(x, y)
+
+	case *ast.IndexExpr:
+		y, ok := y.(*ast.IndexExpr)
+		return ok && astIndexExprEq(x, y)
+
+	case *ast.SliceExpr:
+		y, ok := y.(*ast.SliceExpr)
+		return ok && astSliceExprEq(x, y)
+
+	case *ast.TypeAssertExpr:
+		y, ok := y.(*ast.TypeAssertExpr)
+		return ok && astTypeAssertExprEq(x, y)
+
+	case *ast.CallExpr:
+		y, ok := y.(*ast.CallExpr)
+		return ok && astCallExprEq(x, y)
+
+	case *ast.StarExpr:
+		y, ok := y.(*ast.StarExpr)
+		return ok && astStarExprEq(x, y)
+
+	case *ast.UnaryExpr:
+		y, ok := y.(*ast.UnaryExpr)
+		return ok && astUnaryExprEq(x, y)
+
+	case *ast.BinaryExpr:
+		y, ok := y.(*ast.BinaryExpr)
+		return ok && astBinaryExprEq(x, y)
+
+	case *ast.KeyValueExpr:
+		y, ok := y.(*ast.KeyValueExpr)
+		return ok && astKeyValueExprEq(x, y)
+
+	case *ast.ArrayType:
+		y, ok := y.(*ast.ArrayType)
+		return ok && astArrayTypeEq(x, y)
+
+	case *ast.StructType:
+		y, ok := y.(*ast.StructType)
+		return ok && astStructTypeEq(x, y)
+
+	case *ast.FuncType:
+		y, ok := y.(*ast.FuncType)
+		return ok && astFuncTypeEq(x, y)
+
+	case *ast.InterfaceType:
+		y, ok := y.(*ast.InterfaceType)
+		return ok && astInterfaceTypeEq(x, y)
+
+	case *ast.MapType:
+		y, ok := y.(*ast.MapType)
+		return ok && astMapTypeEq(x, y)
+
+	case *ast.ChanType:
+		y, ok := y.(*ast.ChanType)
+		return ok && astChanTypeEq(x, y)
+
+	case *ast.Ellipsis:
+		y, ok := y.(*ast.Ellipsis)
+		return ok && astEllipsisEq(x, y)
+
+	default:
+		return false
+	}
+}
+
+func astStmtEq(x, y ast.Stmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+
+	switch x := x.(type) {
+	case *ast.ExprStmt:
+		y, ok := y.(*ast.ExprStmt)
+		return ok && astExprStmtEq(x, y)
+
+	case *ast.SendStmt:
+		y, ok := y.(*ast.SendStmt)
+		return ok && astSendStmtEq(x, y)
+
+	case *ast.IncDecStmt:
+		y, ok := y.(*ast.IncDecStmt)
+		return ok && astIncDecStmtEq(x, y)
+
+	case *ast.AssignStmt:
+		y, ok := y.(*ast.AssignStmt)
+		return ok && astAssignStmtEq(x, y)
+
+	case *ast.GoStmt:
+		y, ok := y.(*ast.GoStmt)
+		return ok && astGoStmtEq(x, y)
+
+	case *ast.DeferStmt:
+		y, ok := y.(*ast.DeferStmt)
+		return ok && astDeferStmtEq(x, y)
+
+	case *ast.ReturnStmt:
+		y, ok := y.(*ast.ReturnStmt)
+		return ok && astReturnStmtEq(x, y)
+
+	case *ast.BranchStmt:
+		y, ok := y.(*ast.BranchStmt)
+		return ok && astBranchStmtEq(x, y)
+
+	case *ast.BlockStmt:
+		y, ok := y.(*ast.BlockStmt)
+		return ok && astBlockStmtEq(x, y)
+
+	case *ast.IfStmt:
+		y, ok := y.(*ast.IfStmt)
+		return ok && astIfStmtEq(x, y)
+
+	case *ast.CaseClause:
+		y, ok := y.(*ast.CaseClause)
+		return ok && astCaseClauseEq(x, y)
+
+	case *ast.SwitchStmt:
+		y, ok := y.(*ast.SwitchStmt)
+		return ok && astSwitchStmtEq(x, y)
+
+	case *ast.TypeSwitchStmt:
+		y, ok := y.(*ast.TypeSwitchStmt)
+		return ok && astTypeSwitchStmtEq(x, y)
+
+	case *ast.CommClause:
+		y, ok := y.(*ast.CommClause)
+		return ok && astCommClauseEq(x, y)
+
+	case *ast.SelectStmt:
+		y, ok := y.(*ast.SelectStmt)
+		return ok && astSelectStmtEq(x, y)
+
+	case *ast.ForStmt:
+		y, ok := y.(*ast.ForStmt)
+		return ok && astForStmtEq(x, y)
+
+	case *ast.RangeStmt:
+		y, ok := y.(*ast.RangeStmt)
+		return ok && astRangeStmtEq(x, y)
+
+	case *ast.DeclStmt:
+		y, ok := y.(*ast.DeclStmt)
+		return ok && astDeclStmtEq(x, y)
+
+	case *ast.LabeledStmt:
+		y, ok := y.(*ast.LabeledStmt)
+		return ok && astLabeledStmtEq(x, y)
+
+	case *ast.EmptyStmt:
+		y, ok := y.(*ast.EmptyStmt)
+		return ok && astEmptyStmtEq(x, y)
+
+	default:
+		return false
+	}
+}
+
+func astDeclEq(x, y ast.Decl) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+
+	switch x := x.(type) {
+	case *ast.GenDecl:
+		y, ok := y.(*ast.GenDecl)
+		return ok && astGenDeclEq(x, y)
+
+	case *ast.FuncDecl:
+		y, ok := y.(*ast.FuncDecl)
+		return ok && astFuncDeclEq(x, y)
+
+	default:
+		return false
+	}
+}
+
+// Compare concrete nodes for equallity.
+//
+// Any node of pointer type permitted to be nil,
+// hence nil checks are mandatory.
+
+func astIdentEq(x, y *ast.Ident) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Name == y.Name
+}
+
+func astKeyValueExprEq(x, y *ast.KeyValueExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.Key, y.Key) && astExprEq(x.Value, y.Value)
+}
+
+func astArrayTypeEq(x, y *ast.ArrayType) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.Len, y.Len) && astExprEq(x.Elt, y.Elt)
+}
+
+func astStructTypeEq(x, y *ast.StructType) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astFieldListEq(x.Fields, y.Fields)
+}
+
+func astFuncTypeEq(x, y *ast.FuncType) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astFieldListEq(x.Params, y.Params) &&
+		astFieldListEq(x.Results, y.Results)
+}
+
+func astBasicLitEq(x, y *ast.BasicLit) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Kind == y.Kind && x.Value == y.Value
+}
+
+func astBlockStmtEq(x, y *ast.BlockStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astStmtSliceEq(x.List, y.List)
+}
+
+func astFieldEq(x, y *ast.Field) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astIdentSliceEq(x.Names, y.Names) &&
+		astExprEq(x.Type, y.Type)
+}
+
+func astFuncLitEq(x, y *ast.FuncLit) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astFuncTypeEq(x.Type, y.Type) &&
+		astBlockStmtEq(x.Body, y.Body)
+}
+
+func astCompositeLitEq(x, y *ast.CompositeLit) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.Type, y.Type) &&
+		astExprSliceEq(x.Elts, y.Elts)
+}
+
+func astSelectorExprEq(x, y *ast.SelectorExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.X, y.X) && astIdentEq(x.Sel, y.Sel)
+}
+
+func astIndexExprEq(x, y *ast.IndexExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.X, y.X) && astExprEq(x.Index, y.Index)
+}
+
+func astSliceExprEq(x, y *ast.SliceExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.X, y.X) &&
+		astExprEq(x.Low, y.Low) &&
+		astExprEq(x.High, y.High) &&
+		astExprEq(x.Max, y.Max)
+}
+
+func astTypeAssertExprEq(x, y *ast.TypeAssertExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.X, y.X) && astExprEq(x.Type, y.Type)
+}
+
+func astInterfaceTypeEq(x, y *ast.InterfaceType) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astFieldListEq(x.Methods, y.Methods)
+}
+
+func astMapTypeEq(x, y *ast.MapType) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.Key, y.Key) && astExprEq(x.Value, y.Value)
+}
+
+func astChanTypeEq(x, y *ast.ChanType) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Dir == y.Dir && astExprEq(x.Value, y.Value)
+}
+
+func astCallExprEq(x, y *ast.CallExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.Fun, y.Fun) &&
+		astExprSliceEq(x.Args, y.Args) &&
+		(x.Ellipsis == 0) == (y.Ellipsis == 0)
+}
+
+func astEllipsisEq(x, y *ast.Ellipsis) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.Elt, y.Elt)
+}
+
+func astUnaryExprEq(x, y *ast.UnaryExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Op == y.Op && astExprEq(x.X, y.X)
+}
+
+func astBinaryExprEq(x, y *ast.BinaryExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Op == y.Op &&
+		astExprEq(x.X, y.X) &&
+		astExprEq(x.Y, y.Y)
+}
+
+func astParenExprEq(x, y *ast.ParenExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.X, y.X)
+}
+
+func astStarExprEq(x, y *ast.StarExpr) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.X, y.X)
+}
+
+func astFieldListEq(x, y *ast.FieldList) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astFieldSliceEq(x.List, y.List)
+}
+
+func astEmptyStmtEq(x, y *ast.EmptyStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Implicit == y.Implicit
+}
+
+func astLabeledStmtEq(x, y *ast.LabeledStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astIdentEq(x.Label, y.Label) && astStmtEq(x.Stmt, y.Stmt)
+}
+
+func astExprStmtEq(x, y *ast.ExprStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.X, y.X)
+}
+
+func astSendStmtEq(x, y *ast.SendStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprEq(x.Chan, y.Chan) && astExprEq(x.Value, y.Value)
+}
+
+func astDeclStmtEq(x, y *ast.DeclStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astDeclEq(x.Decl, y.Decl)
+}
+
+func astIncDecStmtEq(x, y *ast.IncDecStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Tok == y.Tok && astExprEq(x.X, y.X)
+}
+
+func astAssignStmtEq(x, y *ast.AssignStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Tok == y.Tok &&
+		astExprSliceEq(x.Lhs, y.Lhs) &&
+		astExprSliceEq(x.Rhs, y.Rhs)
+}
+
+func astGoStmtEq(x, y *ast.GoStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astCallExprEq(x.Call, y.Call)
+}
+
+func astDeferStmtEq(x, y *ast.DeferStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astCallExprEq(x.Call, y.Call)
+}
+
+func astReturnStmtEq(x, y *ast.ReturnStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprSliceEq(x.Results, y.Results)
+}
+
+func astBranchStmtEq(x, y *ast.BranchStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Tok == y.Tok && astIdentEq(x.Label, y.Label)
+}
+
+func astIfStmtEq(x, y *ast.IfStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astStmtEq(x.Init, y.Init) &&
+		astExprEq(x.Cond, y.Cond) &&
+		astBlockStmtEq(x.Body, y.Body) &&
+		astStmtEq(x.Else, y.Else)
+}
+
+func astCaseClauseEq(x, y *ast.CaseClause) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astExprSliceEq(x.List, y.List) &&
+		astStmtSliceEq(x.Body, y.Body)
+}
+
+func astSwitchStmtEq(x, y *ast.SwitchStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astStmtEq(x.Init, y.Init) &&
+		astExprEq(x.Tag, y.Tag) &&
+		astBlockStmtEq(x.Body, y.Body)
+}
+
+func astTypeSwitchStmtEq(x, y *ast.TypeSwitchStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astStmtEq(x.Init, y.Init) &&
+		astStmtEq(x.Assign, y.Assign) &&
+		astBlockStmtEq(x.Body, y.Body)
+}
+
+func astCommClauseEq(x, y *ast.CommClause) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astStmtEq(x.Comm, y.Comm) && astStmtSliceEq(x.Body, y.Body)
+}
+
+func astSelectStmtEq(x, y *ast.SelectStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astBlockStmtEq(x.Body, y.Body)
+}
+
+func astForStmtEq(x, y *ast.ForStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astStmtEq(x.Init, y.Init) &&
+		astExprEq(x.Cond, y.Cond) &&
+		astStmtEq(x.Post, y.Post) &&
+		astBlockStmtEq(x.Body, y.Body)
+}
+
+func astRangeStmtEq(x, y *ast.RangeStmt) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return x.Tok == y.Tok &&
+		astExprEq(x.Key, y.Key) &&
+		astExprEq(x.Value, y.Value) &&
+		astExprEq(x.X, y.X) &&
+		astBlockStmtEq(x.Body, y.Body)
+}
+
+func astFuncDeclEq(x, y *ast.FuncDecl) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astFieldListEq(x.Recv, y.Recv) &&
+		astIdentEq(x.Name, y.Name) &&
+		astFuncTypeEq(x.Type, y.Type) &&
+		astBlockStmtEq(x.Body, y.Body)
+}
+
+func astGenDeclEq(x, y *ast.GenDecl) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+
+	if x.Tok != y.Tok {
+		return false
+	}
+	if len(x.Specs) != len(y.Specs) {
+		return false
+	}
+
+	switch x.Tok {
+	case token.IMPORT:
+		for i := range x.Specs {
+			xspec := x.Specs[i].(*ast.ImportSpec)
+			yspec := y.Specs[i].(*ast.ImportSpec)
+			if !astImportSpecEq(xspec, yspec) {
+				return false
+			}
+		}
+	case token.TYPE:
+		for i := range x.Specs {
+			xspec := x.Specs[i].(*ast.TypeSpec)
+			yspec := y.Specs[i].(*ast.TypeSpec)
+			if !astTypeSpecEq(xspec, yspec) {
+				return false
+			}
+		}
+	default:
+		for i := range x.Specs {
+			xspec := x.Specs[i].(*ast.ValueSpec)
+			yspec := y.Specs[i].(*ast.ValueSpec)
+			if !astValueSpecEq(xspec, yspec) {
+				return false
+			}
+		}
+	}
+
+	return true
+}
+
+func astImportSpecEq(x, y *ast.ImportSpec) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astIdentEq(x.Name, y.Name) && astBasicLitEq(x.Path, y.Path)
+}
+
+func astTypeSpecEq(x, y *ast.TypeSpec) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astIdentEq(x.Name, y.Name) && astExprEq(x.Type, y.Type)
+}
+
+func astValueSpecEq(x, y *ast.ValueSpec) bool {
+	if x == nil || y == nil {
+		return x == y
+	}
+	return astIdentSliceEq(x.Names, y.Names) &&
+		astExprEq(x.Type, y.Type) &&
+		astExprSliceEq(x.Values, y.Values)
+}
+
+// Compare slices for equallity.
+//
+// Each slice element that has pointer type permitted to be nil,
+// hence instead of using adhoc comparison of values,
+// equallity functions that are defined above are used.
+
+func astIdentSliceEq(xs, ys []*ast.Ident) bool {
+	if len(xs) != len(ys) {
+		return false
+	}
+	for i := range xs {
+		if !astIdentEq(xs[i], ys[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+func astFieldSliceEq(xs, ys []*ast.Field) bool {
+	if len(xs) != len(ys) {
+		return false
+	}
+	for i := range xs {
+		if !astFieldEq(xs[i], ys[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+func astStmtSliceEq(xs, ys []ast.Stmt) bool {
+	if len(xs) != len(ys) {
+		return false
+	}
+	for i := range xs {
+		if !astStmtEq(xs[i], ys[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+func astExprSliceEq(xs, ys []ast.Expr) bool {
+	if len(xs) != len(ys) {
+		return false
+	}
+	for i := range xs {
+		if !astExprEq(xs[i], ys[i]) {
+			return false
+		}
+	}
+	return true
+}
diff --git a/vendor/github.com/go-toolsmith/astequal/go.mod b/vendor/github.com/go-toolsmith/astequal/go.mod
new file mode 100644
index 000000000..86fa40772
--- /dev/null
+++ b/vendor/github.com/go-toolsmith/astequal/go.mod
@@ -0,0 +1 @@
+module github.com/go-toolsmith/astequal