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+An invalid left-hand side expression was used on an assignment operation.
+
+Erroneous code example:
+
+```compile_fail,E0067
+12 += 1; // error!
+```
+
+You need to have a place expression to be able to assign it something. For
+example:
+
+```
+let mut x: i8 = 12;
+x += 1; // ok!
+```