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c:\test>perl -E"chop for 'fred'; print 'here' "
Modification of a read-only value attempted at -e line 1.

c:\test>perl -E"eval{ chop; } for 'fred'; print 'here' "
here

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