$ perl -wE 'use Digest::SHA "sha256_hex"; say sha256_hex("joe.smith@aol.com")'
Possible unintended interpolation of @aol in string at -e line 1.
Name "main::aol" used only once: possible typo at -e line 1.
4ea2142392947d467539285b3c6e98f073d9d85910f2a1d535f86a95358ab9dd
$ perl -Mstrict -wE 'use Digest::SHA "sha256_hex"; say sha256_hex("joe.smith@aol.com")'
Possible unintended interpolation of @aol in string at -e line 1.
Global symbol "@aol" requires explicit package name (did you forget to declare "my @aol"?) at -e line 1.
Execution of -e aborted due to compilation errors.