various FileHandle vs IO::File bugs

[Tom Christiansen <tchrist@chthon.perl.com>]

There seem to be some conflicts here:

    % ./perl -e 'use FileHandle; use IO::File'
    Prototype mismatch: sub main::SEEK_SET vs () at blib/Exporter.pm line 57.
	    Exporter::import('SEEK_SET', 'SEEK_CUR', 'SEEK_END', 'O_ACCMODE', 'O_APPEND', 'O_ASYNC', 'O_BINARY', 'O_CREAT', ...) called at -e line 1
	    main::BEGIN() called at -e line 1
	    eval '0' called at -e line 1
    Prototype mismatch: sub main::SEEK_CUR vs () at blib/Exporter.pm line 57.
	    Exporter::import('SEEK_SET', 'SEEK_CUR', 'SEEK_END', 'O_ACCMODE', 'O_APPEND', 'O_ASYNC', 'O_BINARY', 'O_CREAT', ...) called at -e line 1
	    main::BEGIN() called at -e line 1
	    eval '0' called at -e line 1
    Prototype mismatch: sub main::SEEK_END vs () at blib/Exporter.pm line 57.
	    Exporter::import('SEEK_SET', 'SEEK_CUR', 'SEEK_END', 'O_ACCMODE', 'O_APPEND', 'O_ASYNC', 'O_BINARY', 'O_CREAT', ...) called at -e line 1
	    main::BEGIN() called at -e line 1
	    eval '0' called at -e line 1

    % perl -e 'use IO::File; use FileHandle'
    Constant subroutine SEEK_SET redefined at -e line 1
    Prototype mismatch: sub main::SEEK_SET () vs none at -e line 1
    Constant subroutine SEEK_CUR redefined at -e line 1
    Prototype mismatch: sub main::SEEK_CUR () vs none at -e line 1
    Constant subroutine SEEK_END redefined at -e line 1
    Prototype mismatch: sub main::SEEK_END () vs none at -e line 1

Or using the new warnings stuff:

    % perl -W -e 'use IO::File; use FileHandle'
    Constant subroutine SEEK_SET redefined at -e line 1
    Prototype mismatch: sub main::SEEK_SET () vs none at -e line 1
    Constant subroutine SEEK_CUR redefined at -e line 1
    Prototype mismatch: sub main::SEEK_CUR () vs none at -e line 1
    Constant subroutine SEEK_END redefined at -e line 1
    Prototype mismatch: sub main::SEEK_END () vs none at -e line 1

    % perl -X -e 'use IO::File; use FileHandle'
    Constant subroutine SEEK_SET redefined at -e line 1
    Constant subroutine SEEK_CUR redefined at -e line 1
    Constant subroutine SEEK_END redefined at -e line 1

Also, shouldn't the last *not* show warnings?  I thought -X turned
everything off.  And how come -X isn't like "no warnings" or "no warnings
'all'", both of which produce the output from the penultimate example,
not that from the last one?

--tom

    PS: This is all under 5.005_63, BTW.

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