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Return the last stored error. This function would be better for the
language developer but it can be helpful for the application developer.
This function should be called immediately after the return to check.
Later, its result can be corrupted from another internal call.
fun [] [I S I S]
Return : [I I S] The last error code, and the internal function, the line and the file from the language source code where the error has been detected.
See the head of this section.