The scheme/foreign library re-exports ffi/unsafe, ffi/unsafe/cvector, and ffi/vector, except that unsafe! must be used to import the unsafe bindings of ffi/unsafe and ffi/unsafe/cvector.

Makes unsafe bindings available.

Like provide, but ids under unsafe are not actually provided. Instead, they are collected for introduction into an importing module via a macro created by define-unsafer.

Cooperates with provide* to define id as a unsafe!-like form that introduces definitions for each binding provided as unsafe. The define-unsafer form must occur after all the provide* forms to which it refers.