Yes, it isn't trapped at compile time:

$ perl '-mfeature=say' -cw 1174218.pl
Name "main::var" used only once: possible typo at 1174218.pl line 7.
1174218.pl syntax OK

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In reply to Re^3: strict "vars" mode for hash key literals? by hippo
in thread strict "vars" mode for hash key literals? by perlancar

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