From type/HyperSeq

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method is-lazy(--> False )

Returns False.

From type/Iterator

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method is-lazy(Iterator:D: --> Bool:D)

Should return True for iterators that consider themselves lazy, and False otherwise.

Built-in operations that know that they can produce infinitely many values return True here, for example (1..6).roll(*).

say (1 .. 100).iterator.is-lazy; # OUTPUT: «False␤» 
say (1 .. ∞).iterator.is-lazy; # OUTPUT: «True␤»

The Iterator role implements this method returning False, indicating a non-lazy iterator.

From type/RaceSeq

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method is-lazy(--> False )

Returns False.

From type/Seq

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method is-lazy(Seq:D:)

Returns True if and only if the underlying iterator or cached list considers itself lazy. If called on an already consumed sequence, throws an error of type X::Seq::Consumed.