Load-Bearing Warnings

I turned warnings off in a script[*0] but made no other changes to it.
This broke the script, in that it would no longer run correctly[*1].  In
other circumstances[*2] I might've regarded this as fun.

Presuming that this isn't a well-known situation, can anybody guess how
it's done?

  [*0]  It was cluttering up the error log with benign 'uninitialized'
  messages, which were obscuring the output (from some other script)
  that I wanted to see.

  [*1]  I'll know better next time than to touch other people's scripts
  without asking them.

  [*2]  Or if happening to other people.

Smylers