Don't ignore doc test.

Cargo.toml

@@ -54,6 +54,12 @@ stable_deref_trait = { version = "1", default-features = false }
 ufmt = "0.2"
 static_assertions = "1.1.0"
 
+[target.'cfg(all(target_arch = "arm", target_os = "none"))'.dev-dependencies]
+cortex-m = "0.7"
+cortex-m-rt = "0.7"
+cortex-m-semihosting = "0.5"
+panic-semihosting = "0.6"
+
 [package.metadata.docs.rs]
 features = ["ufmt", "serde", "defmt-03", "mpmc_large", "portable-atomic-critical-section"]
 # for the pool module

src/mpmc.rs

@@ -7,8 +7,8 @@
 //!
 //! This queue can be constructed in "const context". Placing it in a `static` variable lets *all*
 //! contexts (interrupts/threads/`main`) safely enqueue and dequeue items from it.
-//!
-//! ``` ignore
+#![cfg_attr(all(target_arch = "arm", target_os = "none"), doc = "```no_run\n")]
+#![cfg_attr(not(all(target_arch = "arm", target_os = "none")), doc = "```ignore\n")]
 //! #![no_main]
 //! #![no_std]
 //!
@@ -50,7 +50,7 @@
 //!     *COUNT += 1;
 //! }
 //! ```
-//!
+//! 
 //! # Benchmark
 //!
 //! Measured on a ARM Cortex-M3 core running at 8 MHz and with zero Flash wait cycles