Tim,

I tried this and it seems to work either way.

before pretty printing --
	b _ (el bar) isNil ifTrue:[nil] ifFalse:[el bar].

and after pretty printing --
	b _ (el bar) isNil ifFalse:[el bar].

both assign a new value to b every time through the loop. If the assignment has been inside the block, one might see a difference, but then the block would not have been dropped by pretty-printing.

Cheers,
Bob

On Mon, 19 Nov 2001 08:36:10 -0800 Tim Rowledge <tim at sumeru.stanford.edu> wrote:
>|temp a b|
>inputCollection do:[el|
>  temp _ Array new:2.
>  a _ el foo.
>  b _ (el bar) isNil ifTrue:[nil] ifFalse:[el bar].
>  temp at: 1 put: a.
>  temp at: 2 put: b.
>  outputCollection add: temp]
>
>.... or similar. I know it's a bit ugly but there y'go.
>
>Pretty printing will remove the branch that sets b to nil and since b is
>a method temp that will very possibly have been set to something else in
>a previous loop around.... whoops.