lookup
fun A_Method.lookupByValuesFromList(argumentList: List<A_BasicObject>): A_Definition
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Answer the definition of this A_Method that should be invoked for the given values. Use the testing tree to select a definition. If lookup fails, then write an appropriate error code into errorCode and answer nil.
Return
The selected definition if it's unique.
Parameters
argument
The List of arguments, ordered by position.
Throws
In the event the lookup doesn't produce exactly one definition. Possible error codes are: