Note not catching this in crater

Author: Mark-Simulacrum

posts/2020-07-30-Rust-1.45.1.md

@@ -33,7 +33,9 @@ not affected by the bugs fixed in this release.
 
 In Rust 1.45.0, `rustc`'s const propagation pass did not properly handle
 encountering references when determining whether to propagate a given constant,
-which could lead to incorrect behavior.
+which could lead to incorrect behavior. Our releases are run through [crater],
+and we did not detect it, which helps us be fairly confident that this affects a
+very small set of code in the wild (if any).
 
 The conditions necessary to cause this bug are highly unlikely to occur in
 practice: the code must have inputs consisting of entirely constant values and
@@ -57,3 +59,5 @@ fn main() {
 
 Many people came together to create Rust 1.45.1. We couldn't have done it
 without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.45.1/)
+
+[crater]: https://github.com/rust-lang/crater