[INTERNAL] 

::

 index_in(self, str name) -> int

Find the index for a string describing a particular entry of an input scheme.

example: schemeEntry("x_opt") -> returns NLPSOL_X if FunctionInternal adheres to SCHEME_NLPINput

Extra doc: https://github.com/casadi/casadi/wiki/L_1vk

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/function.hpp#L333

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/function.cpp#L927-L933

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