From type/Enumeration

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An Enumeration property.

enum Norse-gods <Þor Oðin Freija>;
say Freija.key; # OUTPUT: «Freija␤»

From type/X/Syntax/NegatedPair

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Returns the key of the pair that caused the error.

From type/Pair

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multi method key(Pair:D:)

Returns the key part of the Pair.

my $p = (Raku => "d");
say $p.key; # OUTPUT: «Raku␤»