``:error: descr`` can now be used to document error conditions,
naming the type of error object and a description of when the error is
surfaced.

Like the previous Arguments patch, this patch does not apply any special
QAPI syntax highlighting or cross-referencing for the types, but this
can be adjusted in the future if desired.

(At present, I have no commits that add such highlighting. Sphinx also
does not appear to support Grouped fields with optional (or no)
parameters, so the ability to exclude error types is currently not
supported. If you omit the type, Sphinx treats it as a regular field
list and doesn't apply the special Grouping postprocessing to it.)

Signed-off-by: John Snow <jsnow@redhat.com>

qapi-domain fixup - Error field

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/sphinx/qapi-domain.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/docs/sphinx/qapi-domain.py b/docs/sphinx/qapi-domain.py
index 9b83262a0c6..4bfc82aafdf 100644
--- a/docs/sphinx/qapi-domain.py
+++ b/docs/sphinx/qapi-domain.py
@@ -34,7 +34,7 @@
 from sphinx.locale import _, __
 from sphinx.roles import XRefRole
 from sphinx.util import logging
-from sphinx.util.docfields import GroupedField, TypedField
+from sphinx.util.docfields import Field, GroupedField, TypedField
 from sphinx.util.docutils import SphinxDirective
 from sphinx.util.nodes import make_id, make_refnode
 
@@ -261,6 +261,13 @@ class QAPICommand(QAPIObject):
                 names=("arg",),
                 can_collapse=False,
             ),
+            # :error: descr
+            Field(
+                "error",
+                label=_("Errors"),
+                names=("error", "errors"),
+                has_arg=False,
+            ),
         ]
     )
 
-- 
2.47.0