Parens don't build lists in Perl6, commas do: 
my @a := 1,2;
say @a.^name; #List
my @b := 1,;
say @b.^name; #List

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Parens are usually needed because of precedence when embedding the List into another expression. The comma does have another meaning: it's the separator in argument lists.

In reply to Re^3: [Perl 6]: Small discoveries VII, Flattening by Anonymous Monk
in thread [Perl 6]: Small discoveries VII, Flattening by holli

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