diff -r 6cc269bd1c29 -r db5dddb38f5b mercurial/dispatch.py
--- a/mercurial/dispatch.py	Wed Nov 18 23:37:09 2020 -0800
+++ b/mercurial/dispatch.py	Mon Nov 23 10:38:05 2020 -0800
@@ -849,7 +849,7 @@
             ui.setconfig(section, name, value, b'--config')
             configs.append((section, name, value))
         except (IndexError, ValueError):
-            raise error.Abort(
+            raise error.InputError(
                 _(
                     b'malformed --config option: %r '
                     b'(use --config section.name=value)'