>  why a fails and b works

That should be "b" fails and "a" works.

Note also that the following function works:

to-blk: function [string] [blk] [
     blk: copy []
     foreach token parse string "" [append blk to-word token]
     return blk
]

>> c: to-blk "btn green"
== [btn green]
>> view layout c


Regards,

     Ashley

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