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Matches a single element.
class singleton pattern[readonly equality comparable element type]
Declaration: singleton pattern
Announcements: singleton pattern
Direct supertypes: one pattern
All supertypes: reversible pattern / pattern / predicate / function / deeply_immutable data / value / entity / base pattern / validatable / debuggable / Object / stringable
element type singleton element
Declaration: singleton element
Use: singleton element / singleton element
singleton pattern(element type singleton element)
Declaration: constructor
implement boolean matches(element type the element)
Declaration: matches
Direct overrides: one pattern
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