Move check_user_presence to env::tock

src/lib.rs

@@ -24,7 +24,12 @@ use crate::ctap::CtapState;
 use crate::env::Env;
 use libtock_drivers::timer::ClockValue;
 
+// Implementation details must be public for testing (in particular fuzzing).
+#[cfg(feature = "std")]
 pub mod ctap;
+#[cfg(not(feature = "std"))]
+mod ctap;
+// Store example binaries use the flash directly. Eventually, they should access it from env::tock.
 pub mod embedded_flash;
 pub mod env;