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sub blah
{
...

blah(foo => 42, bar => "don't forget this", baz => 'oh!');
blah(foo => 42, baz => 'oh!'); # <-- will die()

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$foo=42;
print nameThatVariable($foo); # '$foo', of course.
...
print nameThatVariable(do { my $tmp=23 }); # '$tmp'?

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