// Copyright 2022 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 dag implements a language for expressing directed acyclic// graphs.//// The general syntax of a rule is://// a, b < c, d;//// which means c and d come after a and b in the partial order// (that is, there are edges from c and d to a and b),// but doesn't provide a relative order between a vs b or c vs d.//// The rules can chain together, as in://// e < f, g < h;//// which is equivalent to//// e < f, g;// f, g < h;//// Except for the special bottom element "NONE", each name// must appear exactly once on the right-hand side of any rule.// That rule serves as the definition of the allowed successor// for that name. The definition must appear before any uses// of the name on the left-hand side of a rule. (That is, the// rules themselves must be ordered according to the partial// order, for easier reading by people.)//// Negative assertions double-check the partial order://// i !< j//// means that it must NOT be the case that i < j.// Negative assertions may appear anywhere in the rules,// even before i and j have been defined.//// Comments begin with #.
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