Through the generosity of Tom Phoenix, I'm in a position to take a few days and write an extra-strict version of use strict qw(subs), one that will explicitly yell at compile time if you've used a sub in your program that doesn't actually exist. I figured before I started in, I'd solicit some opinions on how it should look and behave.

The current restrictions are:

1. Can't actually ride on use strict. (Though I may steal some bits in $^H)
2. Must be lexically scoped
3. Doesn't have to be backwards compatible, though that'd be nice. (perl 5.8.1 would be OK if I can convince Jarkko to put the patches in if it needs them)
4. Shouldn't require forward declarations
5. Doesn't have to be 100% accurate though that'd be nice¹

So, anyone got any suggestions for features, or questions?

¹By this I mean that, if we have to go with source filters, we don't have to catch every bizarre way to invoke subs that there are--this shouldn't yell in cases where it can't be sure