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Add #![feature(param_attrs)] to enable exception example #231

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Add #![feature(param_attrs)] to enable exception example #231

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4 changes: 3 additions & 1 deletion src/start/exceptions.md
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Expand Up @@ -52,7 +52,8 @@ possible.
Here's an example that uses the system timer to raise a `SysTick` exception
roughly every second. The `SysTick` exception handler keeps track of how many
times it has been called in the `COUNT` variable and then prints the value of
`COUNT` to the host console using semihosting.
`COUNT` to the host console using semihosting. The exception
macro currently (Rust 1.39.0 nightly) creates an error - ```error[E0658]: attributes on function parameters are unstable```. This can be avoided by using the inner attribute ```#![feature(param_attrs)]```.

> **NOTE**: You can run this example on any Cortex-M device; you can also run it
> on QEMU
Expand All @@ -61,6 +62,7 @@ times it has been called in the `COUNT` variable and then prints the value of
#![deny(unsafe_code)]
#![no_main]
#![no_std]
#![feature(param_attrs)]

extern crate panic_halt;

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