How can I replicate "each til count subs"

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1

https://learninghub.kx.com/forums/topic/how-can-i-replicate-each-til-count-subs

I am studying a sample from official KDB repo: (https://github.com/kxcontrib/websocket/blob/master/AppendixB/pubsub.q) . There is a line (https://github.com/kxcontrib/websocket/blob/ad2f0b268afaee1fc5f4dda2fc2467440c7e2f0c/AppendixB/pubsub.q#L39) . My overall understanding is that we call function pub with parameters generated by each til count subs . However, while I try to replicate the result from each til count subs in a q console, I get an error as attached.

My question is, how I can replicate the parameters generated from each til count?
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q)tab:([] a:`a`b`c;b:1 2 3) //Create a table 
q)tab 0 //Index in to the table to row 0. A dictionary is returned 
a| `a 
b| 1 

q)til 3 
0 1 2 

q)count tab // tab contains 3 rows 
3 
q)til count tab // 'til' returns numbers up to entered value 
0 1 2 
q){show tab x}each til count tab //Using 'each' and 'show' in a lambda to display each row 
a| `a 
b|  1 
a| `b 
b|  2 
a| `c 
b|  3
3

Each is an iterator/adverb - what that line does is applies pub to each item of ‘til count subs’, not applying pub to ‘each til count subs’.