Definition
paramdecl_list : paramdecl_list , variable_decl | variable_decl
Purpose
A paramdecl_list is a comma-separated sequence of one or more paramdecls.
Semantics
Each inner_decl is an argument to the function. All arguments are passed by value.
Functions may take optional parameters, in the form of inner_decls with initializers. Optional parameters must come at the end of the list.
