tok = token.EQL
	}
	return tok, tok.Precedence()
}

// parseBinaryExpr parses a (possibly) binary expression.
// If x is non-nil, it is used as the left operand.
//
// TODO(rfindley): parseBinaryExpr has become overloaded. Consider refactoring.
func (p *parser) parseBinaryExpr(x ast.Expr, prec1 int) ast.Expr {
	if p.trace {
		defer un(trace(p, "BinaryExpr"))
	}

		return &ast.StarExpr{pos, p.checkExprOrType(x)}
	}

	return p.parsePrimaryExpr(lhs)
}

// If lhs is set and the result is an identifier, it is not resolved.
func (p *parser) parseBinaryExpr(lhs bool, prec1 int) ast.Expr {
	if p.trace {
		defer un(trace(p, "BinaryExpr"))
	}

	x := p.parseUnaryExpr(lhs)
	for prec := p.tok.Precedence(); prec >= prec1; prec-- {