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>perl -we"$a=10; $a->isa('foo');"
Can't call method "isa" without a package or object reference at -e li
+ne 1.
...
>perl -we"eval { $a=10; $a->isa('foo'); }"

>

>perl -we"eval { $a='abc'; $a += 5; }
Argument "abc" isn't numeric in addition (+) at -e line 1.
...
>perl -we"eval { local $SIG{__WARN__} = sub {}; $a='abc'; $a += 5 }"

>

>perl -we"eval { print STDERR qq{foo\n}; }"
Argument "abc" isn't numeric in addition (+) at -e line 1.
...
print() on unopened filehandle STDERR at -e line 1.

>

>perl -we"$a=10; UNIVERSAL::isa($a, 'foo');"

>