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    \$\begingroup\$ I don't understand "use the classes of the selected programming language" \$\endgroup\$ Commented Jan 4, 2013 at 15:07
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    \$\begingroup\$ Is it ok to define a function that calls inner function like this def s{def t=s;t} ? \$\endgroup\$ Commented Jan 4, 2013 at 15:10
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    \$\begingroup\$ In most languages, classes are only a special kind of data structure, not the center of the universe. Many don't even have such a thing. \$\endgroup\$ Commented Jan 4, 2013 at 21:42
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    \$\begingroup\$ The funny thing here is that languages that require tail recursion elimination (and implementations that support it when the languages does not require it)---which are in a very real sense better---are at a disadvantage on this. TwiNight's answer links to the version of this that exists on Stack Overflow from the early days. \$\endgroup\$ Commented Jan 4, 2013 at 22:13
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    \$\begingroup\$ From the java doc: Thrown when a stack overflow occurs because an application recurses too deeply. docs.oracle.com/javase/6/docs/api/java/lang/… \$\endgroup\$ Commented Apr 9, 2013 at 16:24