From @masak

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«�[31m===�[0mSORRY!�[31m===�[0m␤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␤»

From @moritz

Now fixed, and tested in S02-literals/string-interpolation.t.
diakopter++ for triaging.

@moritz - Status changed from 'new' to 'resolved'