From type/IO/Handle

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method EOF(IO::Handle:D: --> Bool:D)

Indicates whether "end of file" has been reached for the data source of the handle; i.e. no more data can be obtained by calling .READ method. Note that this is not the same as eof method, which will return True only if .EOF returns True and all the decoder buffers, if any were used by the handle, are also empty. See .READ for an example implementation.

From type/IO/CatHandle

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multi method EOF(|)

The IO::CatHandle type overrides this method to throw a X::NYI exception. If you have a good idea for how this method should behave, tell Rakudo developers about it!