58. Alternative pro mise, one branch being illegal .—In the case of an alternative promise, one branch of which is legal and the other illegal, the legal branch alone can be enforced.
Illustration A and B agree that A shall pay B 1,000 rupees, for which B shall afterwards deliver to A either rice or smuggled opium. This is a valid contract to deliver rice, and a void agreement as to the opium. Appropriation of payments
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