fix super call in list comprehension (#5393)

Author: davidism

CHANGES.rst

@@ -4,6 +4,8 @@ Version 3.0.2
 Unreleased
 
 -   Correct type for ``jinja_loader`` property. :issue:`5388`
+-   Fix error with ``--extra-files`` and ``--exclude-patterns`` CLI options.
+    :issue:`5391`
 
 
 Version 3.0.1

src/flask/cli.py

@@ -858,7 +858,9 @@ def convert(
         self, value: t.Any, param: click.Parameter | None, ctx: click.Context | None
     ) -> t.Any:
         items = self.split_envvar_value(value)
-        return [super().convert(item, param, ctx) for item in items]
+        # can't call no-arg super() inside list comprehension until Python 3.12
+        super_convert = super().convert
+        return [super_convert(item, param, ctx) for item in items]
 
 
 @click.command("run", short_help="Run a development server.")

tests/test_cli.py

@@ -679,3 +679,8 @@ def test_cli_empty(app):
 
     result = app.test_cli_runner().invoke(args=["blue", "--help"])
     assert result.exit_code == 2, f"Unexpected success:\n\n{result.output}"
+
+
+def test_run_exclude_patterns():
+    ctx = run_command.make_context("run", ["--exclude-patterns", __file__])
+    assert ctx.params["exclude_patterns"] == [__file__]