Under -w, I get: 
Subroutine gettimeofday redefined at z:\test.pl line 6.
Constant subroutine gettimeofday redefined at z:\test.pl line 8.
Modified: 42
Restored: 1172750176936000
So, it works, kinda. With warnings.

But unfortunately, local does not work: 

#! perl -w
use strict;
use Time::HiRes;
{
    local *Time::HiRes::gettimeofday{CODE} = sub(){42};
    print "Modified: ", Time::HiRes::gettimeofday,"\n";
}
print "Restored: ", Time::HiRes::gettimeofday

[download]
This results in the following compile time error: 
Can't modify glob elem in local at z:\test.pl line 5, near "} ="
Execution of z:\test.pl aborted due to compilation errors.

In reply to Re^2: restore overridden XS methods by bart
in thread restore overridden XS methods by dk

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