Perl 6
WITCH pipe: Revision 1
^ Mnemonics

"include", "or", "interpolate"

** Captures
** any junctions
** inclusive or

----

^ Used alone

{{|}} as a prefix "coerces to a Capture"<http://perlcabal.org/syn/S02.html#Lists> which is useful for "argument list interpolation"<http://perlcabal.org/syn/S03.html#Argument_List_Interpolating> (also see "here"<http://perlcabal.org/syn/S06.html#Flattening_argument_lists>)
{{|}} between items creates an "any junction"<http://perlcabal.org/syn/S03.html#Junctive_operators>

^ Operators containing this character

{{~| and +| and ?|}} A "bitwise inclusive or"<http://perlcabal.org/syn/S03.html#Additive_precedence>
{{||}} A "tight short circuit inclusive or"<http://perlcabal.org/syn/S03.html#Tight_or_precedence>

^ When used inside regexes

{{|}} splits lists of "Alternatives"<http://perlcabal.org/syn/S05.html#Unchanged_syntactic_features>
{{||}} does the same but behaves closer to "what | did in perl5"<http://perlcabal.org/syn/S05.html#Longest-token_matching>

^ Other Uses

{{|}} in a Signature can grab arguments in their "raw Capture form"<http://perlcabal.org/syn/S06.html#Argument_list_binding>
{{|}} is a "vertical line"<http://perlcabal.org/syn/S26.html> in POD tables

^ Old, deprecated, or other language uses

$| is the autoflush default in perl5


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