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In computer science, the funarg problem refers to the difficulty in implementing first-class functions in programming language implementations so as to use stack-based memory allocation of the functions.
The difficulty only arises if the body of a nested function refers directly to identifiers defined in the environment in which the function is defined, but not in the environment of the function call. A standard resolution is either to forbid such references or to create closures.
There are two subtly different versions of the funarg problem. The upwards funarg problem arises from returning a function from a function call. The downwards funarg problem arises from passing a function as a parameter to another function call.
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