c:\test>perl -E"chop 'fred'; print 'here' "
Can't modify constant item in chop at -e line 1, near "'fred';"
Execution of -e aborted due to compilation errors.

c:\test>perl -E"eval{ chop 'fred' }; print 'here' "
Can't modify constant item in chop at -e line 1, near "'fred' }"
Execution of -e aborted due to compilation errors.