Ticket #75: ticket75.patch

Source/BinaryOpExpr.cobra

@@ -224 +224 @@
             if _type is nil
                 _type = .compiler.passThroughType
             throw
+        if _left inherits DotExpr and _left.definition inherits Property and _left.definition.setPart is nil
+            .throwError('Cannot assign to property [_left.definition.name] since it is read only.')
         left = _left
         right = _right
         assert right.type

Tests/120-classes/500-properties/320-properties-read-only-assign.cobra

@@ +1 @@
+class X
+    
+    var _bob as String?
+    
+    get two as int
+        return 2
+
+    pro bob from var
+    
+    def main is shared
+        x = X()
+        x.bob = "hi"
+        x.two = 4  # .error. Cannot assign