I'm using a run time require to delegate object create to an appropriate subclass like this.

eval "require My::Object::$subclass";
my $obj = My::Object::$subclass->new(@params);
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This works fine, but as I edit subclass.pm and introduce syntax errors, they of course can't be caught at compile time. However I would have expected them to be caught at runtime when the require executes, but they aren't.

What actually happens is that every subroutine including and after the one where the syntax error is, just goes missing and the program complains "Undefined subroutine..." when it first tries to call one of the missing subs. I can confirm the loss of the subroutines in the debugger with 'S' - the sub in the required module where the syntax error is and every sub after it is not listed in the current namespace. The Perl Programming book is silent about the syntax checking behavior of the require command.

• Is this the expected behavior?
• Does require not do any syntax checking?
• Is there a way to force syntax checking of a 'required' module?
• Is there a better way that I should be implementing runtime delegation?

Thanks for any help.

Barry

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