---

yaml
---
r: 33978
b: refs/heads/snap-stage3
c: b4501f4
h: refs/heads/master
v: v3

Author: catamorphism

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: cd6f24f9d14ac90d167386a56e7a6ac1f0318195
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 31a4f40329bec3507ed014700c7d91b1697875e3
+refs/heads/snap-stage3: b4501f4c64501a8ac738288665a0499ecb0aa9b8
 refs/heads/try: d324a424d8f84b1eb049b12cf34182bda91b0024
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

branches/snap-stage3/doc/rust.md

@@ -2244,8 +2244,9 @@ The compiler interprets a variable pattern `x` as a binding _only_ if there is n
 A convention you can use to avoid conflicts is simply to name variants with upper-case letters,
 and local variables with lower-case letters.
 
-Multiple match patterns may be joined with the `|` operator.  A
-range of values may be specified with `..`. For example:
+Multiple match patterns may be joined with the `|` operator.
+A range of values may be specified with `..`.
+For example:
 
 ~~~~
 # let x = 2;
@@ -2257,6 +2258,10 @@ let message = match x {
 };
 ~~~~
 
+Range patterns only work on scalar types
+(like integers and characters; not like vectors and structs, which have sub-components).
+A range pattern may not be a sub-range of another range pattern inside the same `match`.
+
 Finally, match patterns can accept *pattern guards* to further refine the
 criteria for matching a case. Pattern guards appear after the pattern and
 consist of a bool-typed expression following the `if` keyword. A pattern