I have a case where I want to use a module containing a bunch of configuration information for the surrounding system. During testing, I call a special subroutine (_testing_on()) in a BEGIN block to use seperate settings (like connecting to a different database so the live one doesn't get written to).

Here's a one-liner that demonstrates the problem:

$ perl -e 'sub FOO () { 1 } BEGIN{ *FOO = sub () { 2 }; } print FOO;'
Constant subroutine main::FOO redefined at -e line 1.
2

[download]

Normally, that warning is a very good idea, but in this case it just gets in the way.

How can I keep the inline-ableness of a sub NAME () { 1 } while still being able to redefine it under special circumstances without that warning? If necessary, I can live with not being inline, but it'd be really nice.

----
I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

: () { :|:& };:

Note: All code is untested, unless otherwise stated

In reply to Suppressing "Constant Subroutine Redeifined" Error by hardburn

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