blog post on the typeclass index issue

[web.git] / personal / _posts / 2019-04-30-stacked-borrows-2.md

diff --git a/personal/_posts/2019-04-30-stacked-borrows-2.md b/personal/_posts/2019-04-30-stacked-borrows-2.md
index dec44ed4fa1cc1f49b9184ffd11db8e2c19e2181..5b2abb0a5e8d0fc67deedabf994938698e0fc823 100644 (file)
--- a/personal/_posts/2019-04-30-stacked-borrows-2.md
+++ b/personal/_posts/2019-04-30-stacked-borrows-2.md
@@ -16,7 +16,7 @@ Before we start, let me give a brief overview over the posts on Stacked Borrows
 I didn't plan this out in advance, so things are a bit more messy than I would like.
 
 * [Stacked Borrows: An Aliasing Model For Rust]({% post_url 2018-08-07-stacked-borrows %}) is the first post of the series and describes my initial ideas of what Stacked Borrows would look like before I started implementing them. It might be interesting for some of the context it gives, but is largely superseded by the next post.
 I didn't plan this out in advance, so things are a bit more messy than I would like.
 
 * [Stacked Borrows: An Aliasing Model For Rust]({% post_url 2018-08-07-stacked-borrows %}) is the first post of the series and describes my initial ideas of what Stacked Borrows would look like before I started implementing them. It might be interesting for some of the context it gives, but is largely superseded by the next post.

-* [Stacked Borrows Implemented]({% post_url 2018-11-16-stacked-borrows-implementation %}) describes Stacked Borrows 1 and my experience implementing it. It is self-contained; I was not happy with some of my explanations in the original post so I decided to give it another shot. This is the best post to start with, if you are catching up.
+* [Stacked Borrows Implemented]({% post_url 2018-11-16-stacked-borrows-implementation %}) describes Stacked Borrows 1 and my experience implementing it. It is self-contained; I was not happy with some of my explanations in the original post so I decided to give it another shot. **This is the post to read if you are catching up.**

 * [Barriers and Two-phase Borrows in Stacked Borrows]({% post_url 2018-12-26-stacked-borrows-barriers %}) describes how I extended Stacked Borrows 1 with partial support for two-phase borrows and explains the idea of "barriers". You do not have to have read that post to understand Stacked Borrows 2, except for the parts that specifically refer to barriers and two-phase borrows.
 
 ## The problem
 * [Barriers and Two-phase Borrows in Stacked Borrows]({% post_url 2018-12-26-stacked-borrows-barriers %}) describes how I extended Stacked Borrows 1 with partial support for two-phase borrows and explains the idea of "barriers". You do not have to have read that post to understand Stacked Borrows 2, except for the parts that specifically refer to barriers and two-phase borrows.
 
 ## The problem


@@ -35,7 +35,7 @@ fn foo(a: &mut u32, y: *mut u32) -> u32 {
     *a = 1;
     let _b = &*a; // This freezes `*a`. Frozen locations can be read by any raw pointer.
     let _val = unsafe { *y; }; // Hence, this legal in Stacked Borrows.
     *a = 1;
     let _b = &*a; // This freezes `*a`. Frozen locations can be read by any raw pointer.
     let _val = unsafe { *y; }; // Hence, this legal in Stacked Borrows.

-    *a = 2; // But we might want to drop the earlier `*a = 1` because it gets overwritten by this!
+    *a = 2; // But we might want to drop the earlier `*a = 1` because it gets overwritten!

     _val
 }
 {% endhighlight %}
     _val
 }
 {% endhighlight %}