---

yaml
---
r: 207634
b: refs/heads/tmp
c: db9b435
h: refs/heads/master
v: v3

Author: GuillaumeGomez

[refs]

@@ -32,7 +32,7 @@ refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
 refs/heads/beta: cd7d89af9169885642d43597302af69f842bbd78
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
-refs/heads/tmp: c795406e1917c99490fd68d19d10f577fb01a607
+refs/heads/tmp: db9b4357495b9d64d2ce88f62f2db078f4aadfbc
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f
 refs/tags/homu-tmp: 704c2ee730d2e948d11a2edd77e3f35de8329a6e
 refs/heads/gate: 97c84447b65164731087ea82685580cc81424412

branches/tmp/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 !
+}
+
 ```
 "##,