Hi rebolers,
being busy with some dialecting I bumped into a kind of context
(variable scope) problem.
Here follows a small example:
==============================================================================================================================================
REBOL []
dc: make object! [
rule: [set num1 number! '+ set num2 number! (print num1 + num2 res:
insert tail res (num1 + num2))]
calc: func [
input [block!]
/local
res
num1
num2
][
res: copy []
if not parse input rule [
res: "Bad input!"
]
print head res
]
]
dc/calc [5 + 2]
halt
==============================================================================================================================================
When executing dc/calc [5 + 2] it says:
7
** Script Error: res has no value
** Where: calc
** Near: res: insert tail res (num1 + num2)
Which means that variables num1 and num2 are having a value, added and
printed (7),
but res has no value.
However res is defined in dc/calc and is being initialized properly
right before executing the parse.
When I define res at the same level as I did rule and not within clc,
everything works fine.
Any hints to improve my understanding?
TIA
Kind regards,
Arie
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