Process.hibernate

You're seeing just the function hibernate, go back to Process module for more information.
Link to this function

hibernate(mod, fun_name, args)

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Specs

hibernate(module(), atom(), list()) :: no_return()

Puts the calling process into a "hibernation" state.

The calling process is put into a waiting state where its memory allocation has been reduced as much as possible, which is useful if the process does not expect to receive any messages in the near future.

See :erlang.hibernate/3 for more information.

Inlined by the compiler.