[rust] fix some miri errors #1937

`cargo +nightly miri test --no-fail-fast -- --test-threads 1 --nocapture`

rust/build/build.rs

@@ -17,6 +17,8 @@ fn main() {
     // The bindgen::Builder is the main entry point to bindgen, and lets you
     // build up options for the resulting bindings.
     //
+    // https://docs.rs/bindgen/*/bindgen/struct.Builder.html
+    //
     // allow .blacklist_function instead of .blocklist_function for now,
     // until we update bindgen to >= 0.58.
     #[allow(deprecated)]
@@ -48,6 +50,9 @@ fn main() {
         .blacklist_item("MSG_.*")
         .blacklist_item("N[^C].*")
         .blacklist_type("_bindgen.*")
+        // https://github.com/dankamongmen/notcurses/pull/1937
+        // https://github.com/rust-lang/rust-bindgen/issues/1651
+        .layout_tests(false)
         // Don't derive the Copy trait on types with destructors.
         .no_copy("ncdirect")
         .no_copy("ncdplot")

rust/src/lib.rs

@@ -21,6 +21,7 @@
 //! ```rust
 //! use libnotcurses_sys::*;
 //!
+//! # #[cfg(not(miri))]
 //! fn main() -> NcResult<()> {
 //!     let mut nc = Nc::with_flags(NCOPTION_NO_ALTERNATE_SCREEN)?;
 //!     let plane = nc.stdplane();
@@ -29,6 +30,8 @@
 //!     nc.stop()?;
 //!     Ok(())
 //! }
+//! # #[cfg(miri)]
+//! # fn main() {}
 //! ```
 //!
 //! Although you still have to manually call the `stop()` method for [`Nc`] and
@@ -66,6 +69,7 @@
 //!
 //! use libnotcurses_sys::*;
 //!
+//! # #[cfg(not(miri))]
 //! fn main() {
 //!     let options = ffi::notcurses_options {
 //!         termtype: null(),
@@ -93,7 +97,8 @@
 //!         }
 //!     }
 //! }
-//!
+//! # #[cfg(miri)]
+//! # fn main() {}
 //! ```
 //!
 //! ### The `notcurses` C API docs