---
title: '"What The Hardware Does" is not What Your Program Does: Uninitialized Memory'
-categories: rust research
+categories: rust research programming
forum: https://internals.rust-lang.org/t/what-the-hardware-does-is-not-what-your-program-does-uninitialized-memory/10561
---
}
{% endhighlight %}
`always_returns_true` is a function that, clearly, will return `true` for any possible 8-bit unsigned integer.
-After all, *every* possible value for `x` will be less than 150 or bigger than 120.
+After all, *every* possible value for `x` will be either less than 120, equal to 120, or bigger than 120.
A quick loop [confirms this](https://play.rust-lang.org/?version=stable&mode=release&edition=2018&gist=65b690fa3c1691e11d4d45955358cdbe).
However, if you [run the example](https://play.rust-lang.org/?version=stable&mode=release&edition=2018&gist=812fe3c8655bfedcea37bb18bb70a945), you can see the assertion fail.[^godbolt]