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Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

Gem::SourceList#<<

<<(obj)

Appends obj to the source list which may be a Gem::Source, URI or URI String.

See also .new #clear .from #delete also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0