token.QUO: allNumeric,
		token.REM: allInteger,

		token.AND:     allInteger,
		token.OR:      allInteger,
		token.XOR:     allInteger,
		token.AND_NOT: allInteger,

		token.LAND: allBoolean,
		token.LOR:  allBoolean,
	}
}

// If e != nil, it must be the binary expression; it may be nil for non-constant expressions
// (when invoked for an assignment operation where the binary expression is implicit).

}

// op2tok translates syntax.Operators into token.Tokens.
var op2tok = [...]token.Token{
	syntax.Def:  token.ILLEGAL,
	syntax.Not:  token.NOT,
	syntax.Recv: token.ILLEGAL,

	syntax.OrOr:   token.LOR,
	syntax.AndAnd: token.LAND,

	syntax.Eql: token.EQL,
	syntax.Neq: token.NEQ,
	syntax.Lss: token.LSS,
	syntax.Leq: token.LEQ,
	syntax.Gtr: token.GTR,
	syntax.Geq: token.GEQ,