https://github.com/planetscale/vtprotobuf
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Copyright (c) 2021, PlanetScale Inc. All rights reserved.
Copyright (c) 2013, The GoGo Authors. All rights reserved.
Copyright (c) 2018 The Go Authors. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

pkg go/ast, type File struct, Imports []*ImportSpec
pkg go/ast, type File struct, Name *Ident
pkg go/ast, type File struct, Package token.Pos
pkg go/ast, type File struct, Scope *Scope
pkg go/ast, type File struct, Unresolved []*Ident
pkg go/ast, type Filter func(string) bool
pkg go/ast, type ForStmt struct
pkg go/ast, type ForStmt struct, Body *BlockStmt
pkg go/ast, type ForStmt struct, Cond Expr