[Issue 22316] ImportC is too permissive in allowing variable and function declarations

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22316

--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> ---
An approach to solve this would be something like adding a hash table for
collisions similar to tagSymTab for tag collisions.

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