---

yaml
---
r: 208803
b: refs/heads/snap-stage3
c: db9b435
h: refs/heads/master
i:
  208801: 78772cd
  208799: 9f78df1
v: v3

Author: GuillaumeGomez

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 38a97becdf3e6a6157f6f7ec2d98ade8d8edc193
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: c795406e1917c99490fd68d19d10f577fb01a607
+refs/heads/snap-stage3: db9b4357495b9d64d2ce88f62f2db078f4aadfbc
 refs/heads/try: 7b4ef47b7805a402d756fb8157101f64880a522f
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/dist-snap: ba4081a5a8573875fed17545846f6f6902c8ba8d

branches/snap-stage3/src/librustc_typeck/diagnostics.rs

@@ -139,20 +139,36 @@ and [RFC 809] for more details.
 "##,
 
 E0067: r##"
-The left-hand side of an assignment operator must be an lvalue expression. An
-lvalue expression represents a memory location and includes item paths (ie,
-namespaced variables), dereferences, indexing expressions, and field
-references.
+The left-hand side of a compound assignment expression must be an lvalue
+expression. An lvalue expression represents a memory location and includes
+item paths (ie, namespaced variables), dereferences, indexing expressions,
+and field references.
 
+Let's start with some bad examples:
 ```
 use std::collections::LinkedList;
 
-// Good
-let mut list = LinkedList::new();
-
-
 // Bad: assignment to non-lvalue expression
 LinkedList::new() += 1;
+
+// ...
+
+fn some_func(i: &mut i32) {
+    i += 12; // Error : '+=' operation cannot be applied on a reference !
+}
+
+And now some good examples:
+```
+let mut i : i32 = 0;
+
+i += 12; // Good !
+
+// ...
+
+fn some_func(i: &mut i32) {
+    *i += 12; // Good !
+}
+
 ```
 "##,