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Improved loop example docs to highlight that one cannot have empty loops in idle

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Emil Fresk 2020-09-15 15:41:14 +02:00
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book/en/src/by-example/app.md
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@ -77,6 +77,9 @@ references that are safe to access.
The example below shows that `idle` runs after `init`. The example below shows that `idle` runs after `init`.
**Note:** The `loop {}` in idle cannot be empty as this will crash the microcontroller due to a bug
in LLVM which miss-optimizes empty loops to a `UDF` instruction in release mode.
``` rust ``` rust
{{#include ../../../../examples/idle.rs}} {{#include ../../../../examples/idle.rs}}
``` ```