diff --git a/go/types/expr.go b/go/types/expr.go
index 6efc7b43..9770cd45 100644
--- a/go/types/expr.go
+++ b/go/types/expr.go
@@ -1246,7 +1246,7 @@ func (check *Checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 		switch typ := x.typ.Underlying().(type) {
 		case *Basic:
 			if isString(typ) {
-				if slice3(e) {
+				if e.Slice3 {
 					check.invalidOp(x.pos(), "3-index slice of string")
 					goto Error
 				}
@@ -1290,7 +1290,7 @@ func (check *Checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
 		x.mode = value
 
 		// spec: "Only the first index may be omitted; it defaults to 0."
-		if slice3(e) && (e.High == nil || sliceMax(e) == nil) {
+		if e.Slice3 && (e.High == nil || e.Max == nil) {
 			check.error(e.Rbrack, "2nd and 3rd index required in 3-index slice")
 			goto Error
 		}
diff --git a/go/types/go11.go b/go/types/go11.go
deleted file mode 100644
index cf41cabe..00000000
--- a/go/types/go11.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// 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.
-
-// +build !go1.2
-
-package types
-
-import "go/ast"
-
-func slice3(x *ast.SliceExpr) bool {
-	return false
-}
-
-func sliceMax(x *ast.SliceExpr) ast.Expr {
-	return nil
-}
diff --git a/go/types/go12.go b/go/types/go12.go
deleted file mode 100644
index 20174421..00000000
--- a/go/types/go12.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// 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.
-
-// +build go1.2
-
-package types
-
-import "go/ast"
-
-func slice3(x *ast.SliceExpr) bool {
-	return x.Slice3
-}
-
-func sliceMax(x *ast.SliceExpr) ast.Expr {
-	return x.Max
-}