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Seems reasonable.
The parser will see the leading digit and assume that it is being presented with a numeric constant. The constant ends at the first non-numeric character (the "t").
The undefined action for an expression on the stack is to print it.
So, you get a "10" output to the screen, then the process chokes because is doesn't know what to do with the "to3" token.
I bet if you had a "to3" UDF it would have executed it.
Perhaps the "Function" declaration should complain about illegal function names.
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