For purposes of this subchapter, the term unrealized receivables includes, to the extent not previously includible in income under the method of accounting used by the partnership, any rights (contractual or otherwise) to payment for
(2) services rendered, or to be rendered. For purposes of this section and,
 sections  
731,  
732, and  
741 (but not for purposes of section  
736), such term also includes mining property (as defined in section  
617 (f)(2)), stock in a DISC (as described in section  992 (a)), section  
1245 property (as defined in section  
1245 (a)(3)), stock in certain foreign corporations (as described in section  
1248), section  
1250 property (as defined in section  
1250 (c)), farm land (as defined in section  
1252 (a)), franchises, trademarks, or trade names (referred to in section  
1253 (a)), and an oil, gas, or geothermal property (described in section  
1254) but only to the extent of the amount which would be treated as gain to which section  
617 (d)(1),  
995 (c),  
1245 (a),  
1248 (a),  
1250 (a),  
1252 (a),  
1253 (a), or  
1254 (a) would apply if (at the time of the transaction described in this section or section  
731,  
732, or  
741, as the case may be) such property had been sold by the partnership at its fair market value. For purposes of this section and,
 sections  
731,  
732, and  
741 (but not for purposes of section  
736), such term also includes any market discount bond (as defined in section  
1278) and any short-term obligation (as defined in section  
1283) but only to the extent of the amount which would be treated as ordinary income if (at the time of the transaction described in this section or section  
731,  
732, or  
741, as the case may be) such property had been sold by the partnership.