throw a type error when trying to write to a const variable

This makes them really const. The codegen needs some smaller changes
to ensure that writing to the variable when it's being defined is
allowed.

Change-Id: I781b4bc9c0e0397b9d00cad3daf758a062c17600
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/qml/compiler/qv4compilercontext_p.h b/src/qml/compiler/qv4compilercontext_p.h
index e72704f4b1..9444173840 100644
--- a/src/qml/compiler/qv4compilercontext_p.h
+++ b/src/qml/compiler/qv4compilercontext_p.h
@@ -293,6 +293,7 @@ struct Context {
         };
         Type type = Unresolved;
         bool isArgOrEval = false;
+        bool isConst = false;
         int scope = -1;
         int index = -1;
         bool isValid() const { return type != Unresolved; }