[PATCH 09/16] qapi: Reject section heading in the middle of a doc comment

[Markus Armbruster <armbru@redhat.com>]

docs/devel/qapi-code-gen.txt claims "A heading line must be the first
line of the documentation comment block" since commit
55ec69f8b16 (docs/devel/qapi-code-gen.txt: Update to new rST backend
conventions).  Not true, we have code to make it work anywhere in a
free-form doc comment: commit dcdc07a97cb (qapi: Make section headings
start a new doc comment block).

Make it true, for simplicity's sake.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 scripts/qapi/parser.py                       | 6 +++---
 tests/qapi-schema/doc-good.json              | 4 +++-
 tests/qapi-schema/doc-non-first-section.err  | 1 +
 tests/qapi-schema/doc-non-first-section.json | 6 ++++++
 tests/qapi-schema/doc-non-first-section.out  | 0
 5 files changed, 13 insertions(+), 4 deletions(-)
 create mode 100644 tests/qapi-schema/doc-non-first-section.err
 create mode 100644 tests/qapi-schema/doc-non-first-section.json
 create mode 100644 tests/qapi-schema/doc-non-first-section.out

diff --git a/scripts/qapi/parser.py b/scripts/qapi/parser.py
index cc69f4f770..3aefec1c2b 100644
--- a/scripts/qapi/parser.py
+++ b/scripts/qapi/parser.py
@@ -440,9 +440,9 @@ def get_doc(self, info: QAPISourceInfo) -> List['QAPIDoc']:
                         self,
                         "unexpected '=' markup in definition documentation")
                 if cur_doc.body.text:
-                    cur_doc.end_comment()
-                    docs.append(cur_doc)
-                    cur_doc = QAPIDoc(self, info)
+                    raise QAPIParseError(
+                        self,
+                        "'=' heading must come first in a comment block")
             cur_doc.append(self.val)
             self.accept(False)
 
diff --git a/tests/qapi-schema/doc-good.json b/tests/qapi-schema/doc-good.json
index 24a84fe6d7..0479d16a01 100644
--- a/tests/qapi-schema/doc-good.json
+++ b/tests/qapi-schema/doc-good.json
@@ -9,7 +9,9 @@
 
 ##
 # = Section
-#
+##
+
+##
 # == Subsection
 #
 # *with emphasis*
diff --git a/tests/qapi-schema/doc-non-first-section.err b/tests/qapi-schema/doc-non-first-section.err
new file mode 100644
index 0000000000..eeced2bca7
--- /dev/null
+++ b/tests/qapi-schema/doc-non-first-section.err
@@ -0,0 +1 @@
+doc-non-first-section.json:5:1: '=' heading must come first in a comment block
diff --git a/tests/qapi-schema/doc-non-first-section.json b/tests/qapi-schema/doc-non-first-section.json
new file mode 100644
index 0000000000..1590876061
--- /dev/null
+++ b/tests/qapi-schema/doc-non-first-section.json
@@ -0,0 +1,6 @@
+# = section must be first line
+
+##
+#
+# = Not first
+##
diff --git a/tests/qapi-schema/doc-non-first-section.out b/tests/qapi-schema/doc-non-first-section.out
new file mode 100644
index 0000000000..e69de29bb2
-- 
2.43.0