explain Rust range syntax

diff --git a/ralf/_posts/2019-07-14-uninit.md b/ralf/_posts/2019-07-14-uninit.md
index 702ac47454cbc7d626d74e7f09a151fd1d5fad56..d3fb0fe41cfa9f69261497a47a2429258ffa12ca 100644 (file)
--- a/ralf/_posts/2019-07-14-uninit.md
+++ b/ralf/_posts/2019-07-14-uninit.md
@@ -54,7 +54,7 @@ However, if you [run the example](https://play.rust-lang.org/?version=stable&mod
 ## What *is* uninitialized memory?
 
 How is this possible?
 ## What *is* uninitialized memory?
 
 How is this possible?

-The answer is that every byte in memory cannot just have a value in `0..256`, it can also be "uninitialized".
+The answer is that every byte in memory cannot just have a value in `0..256` (this is Rust syntax for a left-inclusive right-exclusive range), it can also be "uninitialized".

 Memory *remembers* if you initialized it.
 The `x` that is passed to `always_return_true` is *not* the 8-bit representation of some number, it is an uninitialized byte.
 Performing operations such as comparison on uninitialized bytes is undefined behavior.
 Memory *remembers* if you initialized it.
 The `x` that is passed to `always_return_true` is *not* the 8-bit representation of some number, it is an uninitialized byte.
 Performing operations such as comparison on uninitialized bytes is undefined behavior.