[Parrot] #162: Parrot segfaults if specifying a non-sensical namespace

[Parrot]

#162: Parrot segfaults if specifying a non-sensical namespace
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 Reporter:  kjs    |       Owner:     
     Type:  bug    |      Status:  new
 Priority:  major  |   Milestone:     
Component:  none   |     Version:     
 Severity:  fatal  |    Keywords:     
     Lang:         |       Patch:     
 Platform:         |  
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 while inspecting imcc's parser, I noticed that a key, in a keylist, is in
 fact a <var>. A var can be a target, which is just a register.

 So, this is allowed:
 .namespace [$P0]

 which doesn't make sense *at all*.

 Parrot will segfault on this.

 I think the simplest solution is to fix this in the parser (imcc.y); by
 changing some rules, we can fully disallow writing $P0 (registers in
 general) as namespace keys.

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Ticket URL: <https://trac.parrot.org/parrot/ticket/162>
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