I would say the "true line" is either the line with the function name or the line with the closing ) (or the last argument, in the case of a function call without parenthesis).

The reason I say this is because the arguments to a function call may be any expression that can be used on the right-hand side of an assignment, including another function call.

In reply to Re^2: caller() returns wrong line on multi-line function call by RonW
in thread caller() returns wrong line on multi-line function call by jh

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