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Reachability analysis cannot see through FFI #3263

@tautschnig

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@tautschnig

See #3253 (comment) for an example of a test that fails when we don't directly use in Rust the function that is otherwise only invoked from C code. We might consider marking all functions with attribute no_mangle reachable.

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    [C] Feature / EnhancementA new feature request or enhancement to an existing feature.

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