rust: fix doctests

Doctests were not being run by CI, and have broken. Fix them.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

.gitlab-ci.d/buildtest.yml

@@ -131,6 +131,12 @@ build-system-fedora-rust-nightly:
     CONFIGURE_ARGS: --disable-docs --enable-rust --enable-strict-rust-lints
     TARGETS: aarch64-softmmu
     MAKE_CHECK_ARGS: check-build
+  after_script:
+    - source scripts/ci/gitlab-ci-section
+    - section_start test "Running Rust doctests"
+    - cd build
+    - pyvenv/bin/meson devenv -w ../rust ${CARGO-cargo} test --doc -p qemu_api
+
   allow_failure: true
 
 check-system-fedora:

rust/qemu-api/src/vmstate.rs

@@ -294,7 +294,7 @@ impl VMStateField {
 /// # Examples
 ///
 /// ```
-/// # use qemu_api::vmstate::impl_vmstate_forward;
+/// # use qemu_api::impl_vmstate_forward;
 /// pub struct Fifo([u8; 16]);
 /// impl_vmstate_forward!(Fifo);
 /// ```

rust/qemu-api/src/zeroable.rs

@@ -7,7 +7,7 @@
 /// behavior.  This trait in principle could be implemented as just:
 ///
 /// ```
-/// pub unsafe trait Zeroable {
+/// pub unsafe trait Zeroable: Default {
 ///     const ZERO: Self = unsafe { ::core::mem::MaybeUninit::<Self>::zeroed().assume_init() };
 /// }
 /// ```