Function wasmtime_linker_define_instance 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn wasmtime_linker_define_instance(
    linker: &mut wasmtime_linker_t,
    store: WasmtimeStoreContextMut<'_>,
    name: *const u8,
    name_len: usize,
    instance: &Instance,
) -> Option<Box<wasmtime_error_t>>