Quick memory management question

i have quick memory management question. here code:

code:

nsarray *keys = [[[nsarray alloc] initwithobjects: @"1", @"2",nil] autorelease];	  	  nsmutablearray * temp = [[nsmutablearray alloc] init];  	  temp = [nsmutablearray arraywitharray:keys];  	  [temp release];

when release temp object, app crashes. if remove line, runs, of course leak memory.

i've been looking through documentation hours , i've looked @ countless examples , can't figure out why crashes. alloc object, it, release it. i've written conforms documentation, far understand it. missing here?

 

what "doing" other reassigning right away, throws out alloc'd? causing leak.

 

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