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[REBOL] [context] How to compose in a local context

From: atruter:labyrinth:au at: 22-Apr-2004 0:07

Given the following:
>> b: 'a
== a
>> do has [a][set 'a 0]
== 0
>> a
** Script Error: a has no value ** Near: a
>> do has [a][do compose/deep [set [(b)] 0]]
== 0
>> a
== 0 How can I prevent 'compose from binding to the global context? Regards, Ashley