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-rw-r--r--scripts/qapi.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/scripts/qapi.py b/scripts/qapi.py
index 2b43ad2f1b..bd00d01c0f 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -239,6 +239,11 @@ def check_union(expr, expr_info):
                                 "type '%s'"
                                 % (discriminator, base))
         enum_define = find_enum(discriminator_type)
+        # Do not allow string discriminator
+        if not enum_define:
+            raise QAPIExprError(expr_info,
+                                "Discriminator '%s' must be of enumeration "
+                                "type" % discriminator)
 
     # Check every branch
     for (key, value) in members.items():