[PATCH 06/16] qapi: Improve error position for bogus invalid "Returns" section

[Markus Armbruster <armbru@redhat.com>]

When something other than a command has a "Returns" section, the error
message points to the beginning of the definition comment.  Point to
the "Returns" section instead.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 scripts/qapi/parser.py                   | 10 +++++++---
 tests/qapi-schema/doc-invalid-return.err |  2 +-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/scripts/qapi/parser.py b/scripts/qapi/parser.py
index 82db595dcf..a771013959 100644
--- a/scripts/qapi/parser.py
+++ b/scripts/qapi/parser.py
@@ -759,9 +759,13 @@ def connect_feature(self, feature: 'QAPISchemaFeature') -> None:
         self.features[feature.name].connect(feature)
 
     def check_expr(self, expr: QAPIExpression) -> None:
-        if self.has_section('Returns') and 'command' not in expr:
-            raise QAPISemError(self.info,
-                               "'Returns:' is only valid for commands")
+        if 'command' not in expr:
+            sec = next((sec for sec in self.sections
+                        if sec.name == 'Returns'),
+                       None)
+            if sec:
+                raise QAPISemError(sec.info,
+                                   "'Returns:' is only valid for commands")
 
     def check(self) -> None:
 
diff --git a/tests/qapi-schema/doc-invalid-return.err b/tests/qapi-schema/doc-invalid-return.err
index 2ad89c5941..bc5826de20 100644
--- a/tests/qapi-schema/doc-invalid-return.err
+++ b/tests/qapi-schema/doc-invalid-return.err
@@ -1 +1 @@
-doc-invalid-return.json:3: 'Returns:' is only valid for commands
+doc-invalid-return.json:5: 'Returns:' is only valid for commands
-- 
2.43.0