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The first available version (v2_6_3) is shown here.
gemspec_cached_path(spec_file_name)
private
cached gem specification path, if one exists
# File lib/bundler/fetcher.rb, line 270
def gemspec_cached_path(spec_file_name)
paths = Bundler.rubygems.spec_cache_dirs.map {|dir| File.join(dir, spec_file_name) }
paths = paths.select {|path| File.file? path }
paths.first
end
