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

>perl -we"eval { $a=10; $a->isa('foo'); }"

>

##</code><code>##

>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 }"

>

##</code><code>##

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

>perl -we"eval { local *STDERR; print STDERR qq{foo\n}; }"
print() on unopened filehandle STDERR at -e line 1.

>perl -we"eval { local $SIG{__WARN__} = sub {}; local *STDERR; print STDERR qq{foo\n}; }"
print() on unopened filehandle STDERR at -e line 1.

>

##</code><code>##

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

>