Add generic type for result in PopScope #139164

chunhtai · 2023-11-28T19:42:06Z

Adds a generic type and pop result to popscope and its friend.

The use cases are to be able to capture the result when the pop is called.

migration guide: flutter/website#9872

Pre-launch Checklist

I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is test-exempt.
All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

chunhtai · 2023-11-28T23:53:18Z

packages/flutter/lib/src/widgets/navigator_pop_handler.dart

I added this since we added to popScope, but I am not sure if there is a use case for result in NavigatorPopHandler.

I decide to revert this change, I cant think of a reasonable way this can be used.

chunhtai · 2023-11-28T23:58:10Z

This will be a breaking change. will prepare the doc once this is approved

chunhtai · 2024-01-16T18:28:30Z

will reopen once I am back from vacation

chunhtai · 2024-04-09T23:08:29Z

internal test failures are expected, the code needs to be migrated

justinmc

Thanks again for jumping in to help with this so quick after returning from leave!

This looks good, I probably should have done this in the first place. I'm struggling to picture exactly how the types should be used though. Maybe it would be worth adding an example (pop_scope.1.dart).

Consider the pop_scope.0.dart example. If I modify it so that the second page contains a Form that is returned as a result, the type parameters kind of confuse me:

pop_scope.0.dart modified to include a result value

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This sample demonstrates showing a confirmation dialog before navigating
// away from a page.

import 'package:flutter/material.dart';

void main() => runApp(const NavigatorPopHandlerApp());

class NavigatorPopHandlerApp extends StatelessWidget {
  const NavigatorPopHandlerApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      initialRoute: '/home',
      onGenerateRoute: (RouteSettings settings) {
        return switch (settings.name) {
          '/two' => MaterialPageRoute<FormData>(
            builder: (BuildContext context) => const _PageTwo(),
          ),
          _ => MaterialPageRoute(
            builder: (BuildContext context) => const _HomePage(),
          ),
        };
      },
    );
  }
}

class _HomePage extends StatefulWidget {
  const _HomePage();

  @override
  State<_HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<_HomePage> {
  FormData? _formData;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Page One'),
            if (_formData != null)
              Text('Hello ${_formData!.name}, whose favorite food is ${_formData!.favoriteFood}.'),
            TextButton(
              onPressed: () async {
                final FormData formData =
                    await Navigator.of(context).pushNamed<FormData?>('/two')
                    ?? const FormData();
                if (formData != _formData) {
                  setState(() {
                    _formData = formData;
                  });
                }
              },
              child: const Text('Next page'),
            ),
          ],
        ),
      ),
    );
  }
}

class _PageTwo extends StatefulWidget {
  const _PageTwo();

  @override
  State<_PageTwo> createState() => _PageTwoState();
}

class _PageTwoState extends State<_PageTwo> {
  FormData _formData = const FormData();

  /// Shows a dialog and resolves to true when the user has indicated that they
  /// want to pop.
  ///
  /// A return value of null indicates a desire not to pop, such as when the
  /// user has dismissed the modal without tapping a button.
  Future<bool?> _showBackDialog() {
    return showDialog<bool>(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: const Text('Are you sure?'),
          content: const Text(
            'Are you sure you want to leave this page?',
          ),
          actions: <Widget>[
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Nevermind'),
              onPressed: () {
                Navigator.pop(context, false);
              },
            ),
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Leave'),
              onPressed: () {
                Navigator.pop(context, true);
              },
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Page Two'),
            Form(
              child: Column(
                children: <Widget>[
                  TextFormField(
                    decoration: const InputDecoration(
                      hintText: 'Enter your name.',
                    ),
                    onChanged: (String value) {
                      _formData = _formData.copyWith(
                        name: value,
                      );
                    },
                  ),
                  TextFormField(
                    decoration: const InputDecoration(
                      hintText: 'Enter your favorite food.',
                    ),
                    onChanged: (String value) {
                      _formData = _formData.copyWith(
                        favoriteFood: value,
                      );
                    },
                  ),
                ],
              ),
            ),
            // If this type is `Object?`, then it crashes because it doesn't
            // match the type of the MaterialPageRoute.
            PopScope<FormData>(
              canPop: false,
              onPopInvoked: (bool didPop, dynamic result) async {
                if (didPop) {
                  return;
                }
                final bool shouldPop = await _showBackDialog() ?? false;
                if (context.mounted && shouldPop) {
                  Navigator.pop(context, _formData);
                }
              },
              child: TextButton(
                onPressed: () async {
                  final bool shouldPop = await _showBackDialog() ?? false;
                  if (context.mounted && shouldPop) {
                    Navigator.pop(context, _formData);
                  }
                },
                child: const Text('Go back'),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class FormData {
  const FormData({
    this.name = '',
    this.favoriteFood = '',
  });

  final String name;
  final String favoriteFood;

  FormData copyWith({String? name, String? favoriteFood}) {
    return FormData(
      name: name ?? this.name,
      favoriteFood: favoriteFood ?? this.favoriteFood,
    );
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    if (other.runtimeType != runtimeType) {
      return false;
    }
    return other is FormData
        && other.name == name
        && other.favoriteFood == favoriteFood;
  }

  @override
  int get hashCode => Object.hash(name, favoriteFood);
}

My confusion comes from the fact that the result type of the dialog (bool) is different from the result type of the route (FormData). Is that example a good demonstration of this PR or am I using it wrong?

justinmc · 2024-04-10T16:50:02Z

dev/integration_tests/flutter_gallery/lib/demo/material/full_screen_dialog_demo.dart

Avoid underscore here and below. I guess this is less important in an integration test but still might help to write out the parameter.

justinmc · 2024-04-10T16:52:08Z

packages/flutter/lib/src/material/about.dart

Is it possible to make this void? Not sure if it's better but just curious.

this should match the Route generic type in line 1233. I am not sure if both can be void or not, I will have to investigate a bit more

justinmc · 2024-04-10T17:06:21Z

packages/flutter/test/widgets/navigator_test.dart

Pointing out some underscores in this test here and below as well.

justinmc · 2024-04-10T17:15:42Z

packages/flutter/lib/src/widgets/navigator_pop_handler.dart

I wonder if people will want NavigatorPopHandler itself to have a type parameter, which is passed to PopScope here? I guess it's probably best to save that for another PR if/when it's needed.

That was what i did before, but I can't think of a reason you need to access result in NavigatorPopHandler

If I understand correctly, NavigatorPopHandler is for handling system back gesture, which won't have any result

You're right, it shouldn't ever be necessary to set that as far as I can tell.

chunhtai · 2024-04-10T19:28:40Z

@justinmc
It may be easier to understand if you want to create a pop scope wrapper

Details

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This sample demonstrates showing a confirmation dialog before navigating
// away from a page.

import 'package:flutter/material.dart';

void main() => runApp(const NavigatorPopHandlerApp());

class NavigatorPopHandlerApp extends StatelessWidget {
  const NavigatorPopHandlerApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      initialRoute: '/home',
      onGenerateRoute: (RouteSettings settings) {
        return switch (settings.name) {
        '/two' => MaterialPageRoute<FormData>(
          builder: (BuildContext context) => const _PageTwo(),
        ),
        _ => MaterialPageRoute(
        builder: (BuildContext context) => const _HomePage(),
        ),
        };
      },
    );
  }
}

class _HomePage extends StatefulWidget {
  const _HomePage();

  @override
  State<_HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<_HomePage> {
  FormData? _formData;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Page One'),
            if (_formData != null)
              Text('Hello ${_formData!.name}, whose favorite food is ${_formData!.favoriteFood}.'),
            TextButton(
              onPressed: () async {
                final FormData formData =
                    await Navigator.of(context).pushNamed<FormData?>('/two')
                        ?? const FormData();
                if (formData != _formData) {
                  setState(() {
                    _formData = formData;
                  });
                }
              },
              child: const Text('Next page'),
            ),
          ],
        ),
      ),
    );
  }
}

// This is a PopScope wrapper over _PageTwoBody
class _PageTwo extends StatelessWidget {
  const _PageTwo();
  Future<bool?> _showBackDialog(BuildContext context) {
    return showDialog<bool>(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: const Text('Are you sure?'),
          content: const Text(
            'Are you sure you want to leave this page?',
          ),
          actions: <Widget>[
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Nevermind'),
              onPressed: () {
                Navigator.pop(context, false);
              },
            ),
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Leave'),
              onPressed: () {
                Navigator.pop(context, true);
              },
            ),
          ],
        );
      },
    );
  }
  @override
  Widget build(BuildContext context) {
    return PopScope<FormData>(
      canPop: false,
      // We need result here because we don't know what `_PageTwoBody` pop the
      // page with
      onPopInvoked: (bool didPop, FormData? result) async {
        if (didPop) {
          return;
        }
        final bool shouldPop = await _showBackDialog(context) ?? false;
        if (context.mounted && shouldPop) {
          Navigator.pop(context, result);
        }
      },
      child: const _PageTwoBody(),
    );
  }

}

class _PageTwoBody extends StatefulWidget {
  const _PageTwoBody();

  @override
  State<_PageTwoBody> createState() => _PageTwoBodyState();
}

class _PageTwoBodyState extends State<_PageTwoBody> {
  FormData _formData = const FormData();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Page Two'),
            Form(
              child: Column(
                children: <Widget>[
                  TextFormField(
                    decoration: const InputDecoration(
                      hintText: 'Enter your name.',
                    ),
                    onChanged: (String value) {
                      _formData = _formData.copyWith(
                        name: value,
                      );
                    },
                  ),
                  TextFormField(
                    decoration: const InputDecoration(
                      hintText: 'Enter your favorite food.',
                    ),
                    onChanged: (String value) {
                      _formData = _formData.copyWith(
                        favoriteFood: value,
                      );
                    },
                  ),
                ],
              ),
            ),
            // If this type is `Object?`, then it crashes because it doesn't
            // match the type of the MaterialPageRoute.
            TextButton(
              onPressed: () async {
                Navigator.maybePop(context, _formData);
              },
              child: const Text('Go back'),
            ),
          ],
        ),
      ),
    );
  }
}

class FormData {
  const FormData({
    this.name = '',
    this.favoriteFood = '',
  });

  final String name;
  final String favoriteFood;

  FormData copyWith({String? name, String? favoriteFood}) {
    return FormData(
      name: name ?? this.name,
      favoriteFood: favoriteFood ?? this.favoriteFood,
    );
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    if (other.runtimeType != runtimeType) {
      return false;
    }
    return other is FormData
        && other.name == name
        && other.favoriteFood == favoriteFood;
  }

  @override
  int get hashCode => Object.hash(name, favoriteFood);
}

The crash when you use Object? is something we should fix.

justinmc

LGTM with nits.

Thanks for the example about the types, that makes it very clear. I added a comment below about explaining this in the docs.

I think there are some infra failures FYI.

justinmc · 2024-04-10T21:36:31Z

packages/flutter/test/widgets/pop_scope_test.dart

Nit: Too much whitespace here.

justinmc · 2024-04-10T21:43:57Z

packages/flutter/lib/src/widgets/pop_scope.dart

Nit: Can you document what the T parameter means? Maybe something like this, based on MaterialPageRoute's docs:

The type parameter T represents the return type of the route in which this widget appears. This result can be supplied as the route is popped from the stack with [Navigator.pop] by providing the optional result argument. It will be passed into [onPopInvoked] as the result argument with the specified type.

chunhtai · 2024-04-15T18:26:46Z

some update, I am migrating internal code.

auto-submit · 2024-04-18T22:33:29Z

A reason for requesting a revert of flutter/flutter/139164 could
not be found or the reason was not properly formatted. Begin a comment with 'Reason for revert:' to tell the bot why
this issue is being reverted.

chunhtai · 2024-04-18T22:33:54Z

Reason for revert: hard breaking change

This reverts commit 7ee05a0.

Reverts: #139164 Initiated by: chunhtai Reason for reverting: hard breaking change Original PR Author: chunhtai Reviewed By: {justinmc} This change reverts the following previous change: Adds a generic type and pop result to popscope and its friend. The use cases are to be able to capture the result when the pop is called. migration guide: flutter/website#9872

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Adds a generic type and pop result to popscope and its friend. The use cases are to be able to capture the result when the pop is called. migration guide: flutter/website#9872

…lutter#147015) Reverts: flutter#139164 Initiated by: chunhtai Reason for reverting: hard breaking change Original PR Author: chunhtai Reviewed By: {justinmc} This change reverts the following previous change: Adds a generic type and pop result to popscope and its friend. The use cases are to be able to capture the result when the pop is called. migration guide: flutter/website#9872

)" (flutter#147015)" This reverts commit bb4c9b3.

…nPopInvoke (#147016) same as #139164, but make it a soft transition

waiting for flutter/flutter#139164 ## Presubmit checklist - [ ] This PR doesn’t contain automatically generated corrections (Grammarly or similar). - [ ] This PR follows the [Google Developer Documentation Style Guidelines](https://developers.google.com/style) — for example, it doesn’t use _i.e._ or _e.g._, and it avoids _I_ and _we_ (first person). - [ ] This PR uses [semantic line breaks](https://github.com/dart-lang/site-shared/blob/main/doc/writing-for-dart-and-flutter-websites.md#semantic-line-breaks) of 80 characters or fewer. --------- Co-authored-by: Shams Zakhour (ignore Sfshaza) <[email protected]>

flutter/flutter@fb110b9...98685a0 2024-04-19 [email protected] Replace CocoaPods deprecated `exists?` with `exist?` (flutter/flutter#147056) 2024-04-19 [email protected] Roll Flutter Engine from 4ed7a2d6aed9 to 7fafbbf17c02 (2 revisions) (flutter/flutter#147046) 2024-04-19 [email protected] Roll Flutter Engine from 25d773ea90c4 to 4ed7a2d6aed9 (3 revisions) (flutter/flutter#147038) 2024-04-19 [email protected] Update link branches to `main` (continued) (flutter/flutter#146985) 2024-04-19 [email protected] Roll Flutter Engine from b6234dd1984e to 25d773ea90c4 (1 revision) (flutter/flutter#147035) 2024-04-19 [email protected] Roll Flutter Engine from ff471881e90a to b6234dd1984e (2 revisions) (flutter/flutter#147029) 2024-04-19 [email protected] Roll Flutter Engine from 442d14a7e840 to ff471881e90a (1 revision) (flutter/flutter#147025) 2024-04-19 [email protected] Roll Flutter Engine from 6e4a15d31769 to 442d14a7e840 (2 revisions) (flutter/flutter#147023) 2024-04-19 [email protected] Opt out users from GA3 if opted out of GA4 (flutter/flutter#146453) 2024-04-19 [email protected] Roll Flutter Engine from 61bf47d129bb to 6e4a15d31769 (1 revision) (flutter/flutter#147022) 2024-04-18 [email protected] Roll Flutter Engine from 13a6ce419664 to 61bf47d129bb (4 revisions) (flutter/flutter#147017) 2024-04-18 [email protected] Add a breadcrumb for the pub autoroller (flutter/flutter#146786) 2024-04-18 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Add generic type for result in PopScope (#139164)" (flutter/flutter#147015) 2024-04-18 [email protected] Redundant message fix (flutter/flutter#143978) 2024-04-18 [email protected] Clean up flutterRoot (flutter/flutter#147010) 2024-04-18 49699333+dependabot[bot]@users.noreply.github.com Bump actions/upload-artifact from 4.3.1 to 4.3.2 (flutter/flutter#147011) 2024-04-18 [email protected] Add Swift Package Manager as new opt-in feature for iOS and macOS (flutter/flutter#146256) 2024-04-18 [email protected] Refactor framework coverage tests (flutter/flutter#146210) 2024-04-18 [email protected] Roll Flutter Engine from 46ff024bff10 to 13a6ce419664 (3 revisions) (flutter/flutter#147006) 2024-04-18 [email protected] Changing the renderer on the web target should change its build key. (flutter/flutter#147003) 2024-04-18 [email protected] Roll Flutter Engine from 6abfa565a9f9 to 46ff024bff10 (1 revision) (flutter/flutter#147005) 2024-04-18 [email protected] Add generic type for result in PopScope (flutter/flutter#139164) 2024-04-18 [email protected] Roll Flutter Engine from aa6f7411c219 to 6abfa565a9f9 (1 revision) (flutter/flutter#147002) 2024-04-18 [email protected] [tools] Make SnapshotType.platform non-nullable (flutter/flutter#146958) 2024-04-18 [email protected] Roll Flutter Engine from b8e802515b5a to aa6f7411c219 (1 revision) (flutter/flutter#146996) 2024-04-18 [email protected] Roll Flutter Engine from 2c3e9c8bfce6 to b8e802515b5a (2 revisions) (flutter/flutter#146993) 2024-04-18 [email protected] Roll Packages from d39830e to 0e3809d (9 revisions) (flutter/flutter#146992) 2024-04-18 [email protected] Fix memory leaks in navigation rail (flutter/flutter#146988) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

github-actions bot added framework flutter/packages/flutter repository. See also f: labels. f: material design flutter/packages/flutter/material repository. f: cupertino flutter/packages/flutter/cupertino repository f: routes Navigator, Router, and related APIs. labels Nov 28, 2023

chunhtai requested a review from justinmc November 28, 2023 19:42

github-actions bot added a: text input Entering text in a text field or keyboard related problems d: api docs Issues with https://api.flutter.dev/ d: examples Sample code and demos labels Nov 28, 2023

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chunhtai requested a review from goderbauer November 28, 2023 23:57

chunhtai force-pushed the popsope branch from a378d72 to 6baf68e Compare November 29, 2023 17:56

chunhtai mentioned this pull request Nov 29, 2023

Adds popscope migration guide flutter/website#9872

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navaronbracke mentioned this pull request Dec 4, 2023

Provide a way to return data when user does cupertino backswipe #139432

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chunhtai force-pushed the popsope branch from 6baf68e to f866f4a Compare December 11, 2023 23:28

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chunhtai mentioned this pull request Jan 16, 2024

Refactors page API #137792

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justinmc mentioned this pull request Jan 25, 2024

Preserve WillPopScope as an alternate for PopScope #138614

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chunhtai force-pushed the popsope branch from f866f4a to 1efaea3 Compare April 9, 2024 21:30

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justinmc approved these changes Apr 10, 2024

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chunhtai force-pushed the popsope branch from ce82f5b to c6d4c73 Compare April 11, 2024 22:18

chunhtai added 2 commits April 18, 2024 09:01

Add generic type for result in PopScope

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chunhtai force-pushed the popsope branch from 1dbe178 to ca11e96 Compare April 18, 2024 16:20

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auto-submit bot merged commit 7ee05a0 into flutter:master Apr 18, 2024

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Revert "Add generic type for result in PopScope (#139164)"

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Reverts "Add generic type for result in PopScope (#139164)" #147015

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add a new PopScope.onPopWithResultInvoke widget to replace PopScope.onPopInvoke #147016

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Roll Flutter from fb110b98da15 to 4f7b7c93ffdc (27 revisions) flutter/packages#6576

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7ee05a0 Add generic type for result in PopScope (flutter/flutter#139164)

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Roll Flutter from fb110b98da15 to 98685a099fdd (28 revisions) flutter/packages#6577

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7ee05a0 Add generic type for result in PopScope (flutter/flutter#139164)

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chunhtai added a commit to chunhtai/flutter that referenced this pull request Apr 24, 2024

Reland "Reverts "Add generic type for result in PopScope (flutter#139164

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auto-submit bot pushed a commit that referenced this pull request Apr 26, 2024

add a new PopScope.onPopWithResultInvoke widget to replace PopScope.o…

8031a3e

…nPopInvoke (#147016) same as #139164, but make it a soft transition

Add generic type for result in PopScope #139164

Add generic type for result in PopScope #139164

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