1 // Copyright 2024 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package aliases 6 7 import ( 8 "go/token" 9 "go/types" 10 ) 11 12 // Package aliases defines backward compatible shims 13 // for the types.Alias type representation added in 1.22. 14 // This defines placeholders for x/tools until 1.26. 15 16 // NewAlias creates a new TypeName in Package pkg that 17 // is an alias for the type rhs. 18 // 19 // The enabled parameter determines whether the resulting [TypeName]'s 20 // type is an [types.Alias]. Its value must be the result of a call to 21 // [Enabled], which computes the effective value of 22 // GODEBUG=gotypesalias=... by invoking the type checker. The Enabled 23 // function is expensive and should be called once per task (e.g. 24 // package import), not once per call to NewAlias. 25 func NewAlias(enabled bool, pos token.Pos, pkg *types.Package, name string, rhs types.Type) *types.TypeName { 26 if enabled { 27 tname := types.NewTypeName(pos, pkg, name, nil) 28 newAlias(tname, rhs) 29 return tname 30 } 31 return types.NewTypeName(pos, pkg, name, rhs) 32 } 33