Checking $@ is not an appropriate way to check if an eval failed. An eval can fail, but in the clean up (DESTROY for instance), something can unset $@.

The only way to make sure an eval succeeded is to check its return value: 

eval "use Some::Module 94.5; 1" or do {
    printf "Loading Some::Module failed: %s", $@ // "Unknown error";
    ...
};

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In reply to Re^4: Check if module is installed by JavaFan
in thread Check if module is installed by DreamT

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