Editing Impossibility of performance (section)

==Australia==
Frustration usually involves impossibility of performance.<ref>As to impossibility of performance in Australia, see Bradford A Caffrey, "Impossibility: Frustration Doctrine", Guidebook to Contract Law in Australia, [https://books.google.com/books?id=rH1RAQAAIAAJ 4th Edition], CCH Australia, 1991, chapter 14, p 357; J W Carter and D J Harland, "Impossibility of Performance", Contract Law in Australia, [https://books.google.com/books?id=33VAAQAAIAAJ Third Edition], Butterworths, 1996, p 715; "Impossibility of Performance"/"Impossibility", The Australian Digest, 2nd Edition, Law Book Company of Australasia, 1966, [https://books.google.com/books?id=DD1AAQAAIAAJ vol 6], divn 4 of "VII Contracts", col 394; Stewart, Swain and Fairweather, Contract Law: Principles and Context, Cambridge University Press, 2019, [https://books.google.com/books?id=uzCdDwAAQBAJ&pg=PA277 p 277] et seq; Yorston and Fortescue, "Impossibility of Performance", Australian Mercantile Law, [https://books.google.com/books?id=afjzAAAAMAAJ 15th Ed], 1978, p 104; "Impossibility of Performance arising from an Act of State" (1916) [https://books.google.com/books?id=4HdFAQAAMAAJ 38] Australian Law Times 5 (22 July 1916); and Yin, Kozlina, Green, Siliquini-Cinelli, Laryea and Spagnolo, "Contracts which are impossible to perform", Contract Law: Cases and Materials, 2021 chapter 15.2.5, [https://books.google.com/books?id=P0_6DwAAQBAJ&pg=PA483 p 483].</ref> As to whether the non-existence of the subject matter of a contract constitutes (initial) impossibility of performance, see [[McRae v Commonwealth Disposals Commission]].<ref>The Australian Digest, 2nd Ed, 1966, [https://books.google.com/books?id=DD1AAQAAIAAJ vol 6], col 404. (1951) [https://books.google.com/books?id=g-tOAQAAIAAJ 45] Queensland Justice of the Peace and Local Authorities' Journal 149 and 173.</ref> Cf. [[Res extincta]].