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Nice! (Score:1)
Nice post. Just so you know, $x.$meth(...) is fine if $meth is actually a code reference rather than a method name. If you have a name, then you always need the quotes and to interpolate it. If you'd somehow got hold of a method itself (for example through .WALK or by introspection) then you could use the $x.$meth form though. They're distinguished syntactically (quote vs variable). So the error was just telling you that a string isn't something that can be invoked.
Hope this helps!
Jonathan