Support for the Ruby 2.4 series has ended. See here for reference.
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A Lock source wraps an installed gem's source and sorts before other sources during dependency resolution.  This allows RubyGems to prefer gems from dependency lock files.
Creates a new Lock source that wraps source and moves it earlier in the sort list.
 
               # File rubygems/source/lock.rb, line 18
def initialize source
  @wrapped = source
end
             
            Delegates to the wrapped source's fetch_spec method.
 
               # File rubygems/source/lock.rb, line 40
def fetch_spec name_tuple
  @wrapped.fetch_spec name_tuple
end