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A Method defined via def has an executable attribute of class Rubinius::CompiledCode. On the other site a method defined via define_method has an executable attribute of class Rubinius::BlockEnvironment::AsMethod.
Comparing method equality includes the comparison of executable equality.
For comparing an executable of type Rubinius::BlockEnvironment::AsMethod against an executable of Rubinius::CompiledCode results in an error because it tries to access the block_env attribute on an Rubinius::CompiledCode object, which doesn't exist.
This PR adds an early return like in Rubinius::CompiledCode#==
This closes #3118