[perl #79568] [BUG] Unspace should break chain of postcircumfixes in qq string interpolation in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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See 
http://strangelyconsistent.org/blog/november-21-2010-just-a-few-wrinkles-to-iron-out
for the background to this ticket. Especially the update.

<masak> oh, and by the way: that's good news. I like that a backslash
solves the problem.
<TimToady> metoo, which is why we outlawed unspace in quotes (at top
level only, of course)
<masak> oh, I remember that now.
<masak> rakudo: my $foo = "work"; say "This should $foo\</a>"
<p6eval> rakudo : OUTPUT«postcircumfix:<{ }> not defined for type
Str()␤  in main program body at line 1␤»
* masak submits rakudobug
<TimToady> std: my $x; "$x[syntax error]"
<p6eval> std a194beb: OUTPUT«===SORRY!===␤Undeclared
routines:␤        'error' used at line 1␤ 'syntax' used at line
1␤Check failed␤FAILED 00:01 121m␤»
<TimToady> std: my $x; "$x\[syntax error]"
<p6eval> std a194beb: OUTPUT«ok 00:01 120m␤»