$foo=42;
print nameThatVariable($foo); # '$foo', of course.

$foo=[ 42 ];
print nameThatVariable($foo); # still '$foo'.

@bar=( 42 );
print nameThatVariable(@bar); # '@bar', of course.

$baz=$foo=\@bar;
print nameThatVariable($foo); # 'reference to @bar' or '$foo'?
print nameThatVariable($baz); # 'reference to @bar' or '$foo' or '$baz' ?

print nameThatVariable(\@bar); # 'reference to @bar'?

print nameThatVariable(do { my $tmp=23 }); # '$tmp'?

print nameThatVariable([ 23,45 ]); # ?