Infer array length of inline allocated arrays

Fixes bug 644046.

vala/valalocalvariable.vala

@@ -89,9 +89,18 @@ public class Vala.LocalVariable : Variable {
 			variable_type.check (context);
 		}
 
+		// Catch initializer list transformation:
+		bool is_initializer_list = false;
+		int initializer_size = -1;
+
 		if (initializer != null) {
 			initializer.target_type = variable_type;
 
+			if (initializer is InitializerList) {
+				initializer_size = ((InitializerList) initializer).size;
+				is_initializer_list = true;
+			}
+
 			initializer.check (context);
 		}
 
@@ -156,6 +165,20 @@ public class Vala.LocalVariable : Variable {
 				return false;
 			}
 
+
+			ArrayType variable_array_type = variable_type as ArrayType;
+			if (variable_array_type != null && variable_array_type.inline_allocated && !variable_array_type.fixed_length && is_initializer_list) {
+				variable_array_type.length = new IntegerLiteral (initializer_size.to_string ());
+				variable_array_type.fixed_length = true;
+				variable_array_type.nullable = false;
+			}
+
+			if (variable_array_type != null && variable_array_type.inline_allocated && initializer.value_type is ArrayType == false) {
+				error = true;
+				Report.error (source_reference, "only arrays are allowed as initializer for arrays with fixed length");
+				return false;
+			}
+
 			if (initializer.value_type.is_disposable ()) {
 				/* rhs transfers ownership of the expression */
 				if (!(variable_type is PointerType) && !variable_type.value_owned) {