Re: [Bug-apl] Local sysvars in lambdas

[Christian Robert]

try ⎕IO

*after*  )sic

the fact is that when a function is interruped, you see "by the last" 
interrupted function. Until you type )sic or )reset

my 2 cents, as usual, I may be wrong.

Xtian.


On 2016-08-24 21:09, Louis de Forcrand wrote:
>       ∇Z←F N;⎕IO
> [1] Z←⍎(N>1)⊃'N' 'N×F N-1'⊣⎕IO←0∇
>       F 6
> 720
>       f←{⍎(⍵>1)⊃'⍵' '⍵×f ⍵-1'⊣⎕IO←0;⎕IO}
>       f 6
> SYNTAX ERROR
> λ1[1]  λ←⍎(⍵>1)⊃'⍵' '⍵×f ⍵-1'⊣⎕IO←0;⎕IO
>        ^                            ^
>       ⎕IO
> 0
>       )SIC
>       ⎕IO←1
>       f←{⍎(⍵>1)⊃'⍵' '⍵×⍙ ⍵-1'⊣⎕IO←0;⎕IO}
>       f 6
> VALUE ERROR
>       ⍵×⍙ ⍵-1
>         ^
>       ⎕IO
> 0
>       )SIC
>
>
> As is shown, system variables such as ⎕IO cannot be localised
> in lambdas as they can be in del-fns.
> The last example is there because I just thought the order of
> execution was intriguing: it seems to show that the error with
> local ⎕IO was signalled at the end (left) of the lambda. This
> of course might be as it should.
>
> In addition I was wondering if there is a way to refer to the
> enclosing lambda / function anonymously, i.e. ∇ in Dyalog.
> That is how I first entered the faulty symbol, and found this
> potential bug.
>
> Good luck,
> Louis