I suspect that the syntax error is caused by assigning lll twice and not ny localizing ⎕IO.
The first assignment (which most likely happened but is not visible in your example) defines a function:
)clear
CLEAR WS
lll←{⍳⍵⊣⎕io←0;⎕io}
⎕CR 'lll'
λ←λ1 ⍵;⎕io
λ←⍳⍵⊣⎕io←0
At this point lll is a function and ⎕IO is a local variable of it.
The second assigment raises a syntax error because vou try to re-define lll
by assignment which is not allowed in GNU APL. BTW the same error occurs
without localizing ⎕IO.
lll←{⍳⍵⊣⎕io←0;⎕io}
SYNTAX ERROR
lll←λ1
^ ^
Best Regards,
Jürgen
On 8/7/20 11:27 PM, Chris Moller wrote:
I've just discovered that you get a syntax error if you try to localise a system variable in a named lambda:
lll←{⍳⍵⊣⎕io←0;⎕io}Is it supposed to work that way? Or is that a bug?
lll 8
SYNTAX ERROR
lll[1] λ←⍳⍵⊣⎕IO←0;⎕IO
^ ^
