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instance method
Set::SubclassCompatible#select!
select!(&block)
lib/set/subclass_compatible.rb
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# File tmp/rubies/ruby-4.1.0-preview1/lib/set/subclass_compatible.rb, line 219
def select!(&block)
block_given? or return enum_for(__method__) { size }
n = size
keep_if(&block)
self if size != n
end
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