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c23e9a1c81
This macro is always defined to 1 if defined, or undefined.
With `-Wundef` option, checking the value without checking if it is defined causes warnings:
```
/opt/local/include/ffi.h:477:5: warning: 'FFI_GO_CLOSURES' is not defined, evaluates to 0 [-Wundef]
#if FFI_GO_CLOSURES
^
```