maint: Move to /rust/* to /

This makes it easier for tooling to find the Rust stuff.
Rust/non-rust is not a useful distinction in this repo anymore anyway.

nix-bindings-expr/src/value/__private.rs

@@ -0,0 +1,13 @@
+//! Functions that are relevant for other bindings modules, but normally not end users.
+use super::Value;
+use nix_bindings_bindgen_raw as raw;
+
+/// See [Value::new].
+pub unsafe fn raw_value_new(ptr: *mut raw::Value) -> Value {
+    Value::new(ptr)
+}
+
+/// See [Value::new_borrowed].
+pub unsafe fn raw_value_new_borrowed(ptr: *mut raw::Value) -> Value {
+    Value::new_borrowed(ptr)
+}