Removed Default Gems

The following libraries had been default gems before, but have now been removed from core Ruby.

Gem Description Resources
cmath Trigonometric and transcendental functions for complex numbers RubyGems, GitHub, RDoc
e2mmap Abstraction around exception handling RubyGems, GitHub, RDoc
scanf Pure-Ruby scanf implementation RubyGems, GitHub, RDoc
shell Provides a Ruby interface for interacting with the shell RubyGems, GitHub, RDoc
sync Two-phase lock with a counter for multi-threaded code RubyGems, GitHub, RDoc
thwait Waits for threads to finish RubyGems, GitHub, RDoc

More Standard Gems

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