Writes a field identified by a FieldInfo to a C structure or union.
This only handles fields of simple C types. It will fail for a field of a composite type like a nested structure or union even if that is actually writable. Note also that that it will refuse to write fields where memory management would by required. A field with a type such as 'char *' must be set with a setter function.
| mem |
pointer to a block of memory representing a C structure or union |
| value |
a Argument holding the value to store |
| field_info |
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