Hi cLive;-), I believe you already know that the perl -c checks the syntax and catches compile time error such as undeclare variables under strict or missing brackets or semicolon when it's due. As long as the code succeeds to compile, then the syntax is fine. But, this tells nothing about runtime execution. Checking true value of module is done at runtime which happens when the module is require'd or use'd.

However, as you're confident the module ends with 1; I think you need to show your code, specially perhaps the last lines. It seems that perl is as confident as you are in that it doesn't see the true value as the last statement when running the module.