$LOADED_FEATURESっていうのがある。 % pry [1] pry(main)> $LOADED_FEATURES => ["enumerator.so", "/usr/local/opt/rbenv/versions/2.1.0/lib/ruby/2.1.0/x86_64-darwin13.0/enc/encdb.bundle", "/usr/local/opt/rbenv/versions/2.1.0/lib/ruby/2.1.0/x86_64-darwin13.0/enc/trans/transdb.bundle", "/usr/local/opt/rbenv/versions/2.1.0/lib/ruby/2.1.0/x86_64-darwin13.0/rbconfig.rb", "/usr/local/opt/rbenv/versions/2.1.0/lib/ruby