I think the function unpacking is not defined for array types, so the functional form doesn’t work. 
Steven might know more.

There are some cases where functional form is still undefined in the current parser, but this has been worked through
in the new one that Steven has devised. We need to integrate it, but I think that might only happen in version 7.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 30 Jul 2021, at 20:49, Mike McGonagle  wrote:
> 
> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
> That has always been an inconsistent fix for things for me. I tried doing
> 
>     iTwoBoxes[][] = sw_split:i(iBBox, "v", .25)
> 
> and I still get the same error.
> 
> On Fri, Jul 30, 2021 at 2:32 PM Rory Walsh  wrote:
> I think you may need to specify the type? i.e, 
> 
> `iTwoBoxes[][] = sw_split:k(iBBox, "v", .5)`
> 
> 
> On Fri, 30 Jul 2021 at 20:22, Mike McGonagle  wrote:
> I've got an opcode that I am working on, and I am getting an error "Unable to find opcode entry..."
> 
>     iTwoBoxes[][] = sw_split(iBBox, "v", .5)
> 
> but when I take it out of the functional form, it works
> 
>     iTwoBoxes[][] sw_split iBBox, "v", .5
> 
> The opcode definition is
> 
>     opcode sw_split, i[][], i[]Sj
> 
> Do you need more information to give an answer?
> 
> Mike
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