[vala/0.34] vala: Subtype of string is allowed as constant

[Rico Tzschichholz <ricotz src gnome org>]

commit 3904aeb6eaefed80ddd50926f259e87c9507588b
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Nov 18 17:07:38 2017 +0100

    vala: Subtype of string is allowed as constant

 vala/valaconstant.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vala/valaconstant.vala b/vala/valaconstant.vala
index 53b84c6..230c63d 100644
--- a/vala/valaconstant.vala
+++ b/vala/valaconstant.vala
@@ -195,7 +195,7 @@ public class Vala.Constant : Symbol, Lockable {
                } else if (type is ArrayType) {
                        var array_type = type as ArrayType;
                        return check_const_type (array_type.element_type, context);
-               } else if (type.data_type == context.analyzer.string_type.data_type) {
+               } else if (type.data_type.is_subtype_of (context.analyzer.string_type.data_type)) {
                        return true;
                } else {
                        return false;