[vala/0.40] vala: Do not allow += for arrays with fixed length

[Rico Tzschichholz <ricotz src gnome org>]

commit 9e6db51e32e2415a7b97c15cf6e3fc1fa833bd93
Author: Florian Brosch <flo brosch gmail com>
Date:   Wed Sep 17 00:17:01 2014 +0200

    vala: Do not allow += for arrays with fixed length

 tests/Makefile.am                             | 1 +
 tests/arrays/fixed-length-concat-invalid.test | 6 ++++++
 vala/valabinaryexpression.vala                | 4 ++++
 3 files changed, 11 insertions(+)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index b9bdcafaf..9bb4923bd 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -65,6 +65,7 @@ TESTS = \
        arrays/class-field-length-cname.vala \
        arrays/expression-bracket.test \
        arrays/field-global-length-cname.vala \
+       arrays/fixed-length-concat-invalid.test \
        arrays/fixed-length-non-const.test \
        arrays/struct-field-length-cname.vala \
        arrays/slice-invalid-start.test \
diff --git a/tests/arrays/fixed-length-concat-invalid.test b/tests/arrays/fixed-length-concat-invalid.test
new file mode 100644
index 000000000..99f24a34b
--- /dev/null
+++ b/tests/arrays/fixed-length-concat-invalid.test
@@ -0,0 +1,6 @@
+Invalid Code
+
+void main () {
+       int foo[2] = { 23, 42 };
+       foo += 4711;
+}
diff --git a/vala/valabinaryexpression.vala b/vala/valabinaryexpression.vala
index b98197e0d..356347152 100644
--- a/vala/valabinaryexpression.vala
+++ b/vala/valabinaryexpression.vala
@@ -364,6 +364,10 @@ public class Vala.BinaryExpression : Expression {
 
                        var array_type = (ArrayType) left.value_type;
 
+                       if (array_type.inline_allocated) {
+                               error = true;
+                               Report.error (source_reference, "Array concatenation not supported for fixed 
length arrays");
+                       }
                        if (right.value_type == null || !right.value_type.compatible 
(array_type.element_type)) {
                                error = true;
                                Report.error (source_reference, "Incompatible operand");