Build safe foreign-function interfaces between Rust and C with correct layout, ownership transfer, and panic boundaries.
## CONTEXT Rust interoperates with C through a well-defined but unforgiving foreign-function interface. Whether you are calling a C library from Rust or exposing Rust to C and other languages, you must match the C ABI exactly: repr(C) layouts, correct calling conventions, and matching type widths. The hard parts are…
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