X-Git-Url: https://git.ralfj.de/web.git/blobdiff_plain/1af9cc085fccb07e0f1aeb83e47d413b2adcf888..e806a32d3aa3ce53166c46b8eab5d77a9655c251:/ralf/_posts/2017-07-17-types-as-contracts.md

diff --git a/ralf/_posts/2017-07-17-types-as-contracts.md b/ralf/_posts/2017-07-17-types-as-contracts.md
index 10a8e4c..3ef565a 100644
--- a/ralf/_posts/2017-07-17-types-as-contracts.md
+++ b/ralf/_posts/2017-07-17-types-as-contracts.md
@@ -320,7 +320,7 @@ One topic that needs special treatment in this context is interior mutability.
 If a function takes an `x: &Cell<i32>`, following the rules above, it will acquire a read lock of `*x` for the duration of the function call, making `*x` immutable.
 Clearly, we do not want to do that -- calling `x.set` *will* actually mutate `*x`, and mutating through a shared reference is exactly the point of using `Cell`!
 
-Lucky enough, the compiler *already* says that interior mutability is only allowed via [`UnsafeCell`](https://doc.rust-lang.org/beta/core/cell/struct.UnsafeCell.html).
+Lucky enough, the compiler *already* says that interior mutability is only allowed via [`UnsafeCell`](https://doc.rust-lang.org/stable/core/cell/struct.UnsafeCell.html).
 We can use this for our purposes: To adjust validation for interior mutability, we *stop* our recursive descent and do not do anything when reaching an `UnsafeCell` *while `mutbl` indicates we are in immutable mode* -- `&mut UnsafeCell` is not affected.
 In particular, no locks are acquired.
 This justifies calling `set` on a shared reference and having the value changed.