[perl #123808] [BUG] qqw{} and qqww{} flattening behaviour doesn't match

[Will Coleda via RT]

On Sun Mar 01 15:24:23 2015, Mouq wrote:
> Actually, it's qqww{} and << >> that are supposed to be equivalent.
> And they are when it comes to capture context:
> 
> $ perl6 -e'my $a = 42; say <<$a b c>>;'
> 42bc
> $ perl6 -e'my $a = 42; say qqww{$a b c};'
> 42bc
> $ perl6 -e'my $a = 42; say qqw{$a b c};'
> 42 b c
> 
> It's less misleading to say that qqww{} and qqw{} don't flatten the
> same.
> 
> On Thu Feb 12 04:25:15 2015, pcoch wrote:
> > It seems that although qqw{} and << >> are equivalent
> >
> > my $a = 42;
> > <<$a b c>>.perl;      # ("42", "b", "c")
> > qqw{$a b c}.perl;     # ("42", "b", "c")
> >
> > they don't always behave the same.  For instance:
> >
> > my $a = 42; say <<$a b c>>;   # 42bc
> > my $a = 42; say qqw{$a b c};  # 42 b c
> >
> > moritz++ used this on IRC:
> > sub f(*@a) { say @a.elems }; my $a = 42; f «$a b c»; f qqw{$a b c}
> > OUTPUT«3␤3␤»
> >
> > multi f(*@a) { say @a.elems }; multi f($one) { say 'one'}; f «b c»; f
> > qqw{b c}
> > OUTPUT«2␤one␤»
> >
> > and showed that the quoting constructs differ when there is a single-
> > element multi candidate available.
> >
> > One would expect that these two constructs should behave in the same
> > manner.

Current situation:

15:20 < jnthn> m: my $a = 42; say <<$a b c>>;
15:20 <+camelia> rakudo-moar 7c6a55: OUTPUT«(42 b c)␤»
15:21 < jnthn> m: my $a = 42; say qqww{$a b c};
15:21 <+camelia> rakudo-moar 7c6a55: OUTPUT«(42 b c)␤»
15:21 < jnthn> m: my $a = 42; say qqw{$a b c};
15:21 <+camelia> rakudo-moar 7c6a55: OUTPUT«[42 b c]␤»


15:21 < jnthn> m: my $a = 42; say .WHAT for <<$a b c>>, qqww{$a b c}, qqw{$a b
               c}
15:21 <+camelia> rakudo-moar 7c6a55: OUTPUT«(List)␤(List)␤(Array)␤»
15:22 < jnthn> [Coke]: Bit dubious that the last one is Array, not List too
15:22 < [Coke]> I'll add that to the ticket. Thanks.

-- 
Will "Coke" Coleda