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$ perl -we'$= = "123 abc"; print $='
Argument "123 abc" isn't numeric in scalar assignment at -e line 1.
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$ perl -we'$= = undef; print $-'
Use of uninitialized value in scalar assignment at -e line 1.
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$ perl -we'undef $=; print $-'
Use of uninitialized value in undef operator at -e line 1.
0