Debugger expression evaluation only considers first line of multiline expressions for Flutter #55731

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1. TahaTesser

   added

   a: debuggingDebugging, breakpoints, expression evaluationDebugging, breakpoints, expression evaluation

   dependency: dartDart team may need to help usDart team may need to help us

   on Apr 27, 2020
2. TahaTesser commented on Apr 27, 2020

   

   TahaTesser

   on Apr 27, 2020

   Contributor

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   Hi @DanTup
   can you please provide your flutter doctor -v?
   Thank you
3. TahaTesser

   added

   waiting for responseThe Flutter team cannot make further progress on this issue until the original reporter respondsThe Flutter team cannot make further progress on this issue until the original reporter responds

   on Apr 27, 2020
4. DanTup commented on Apr 27, 2020

   

   DanTup

   on Apr 27, 2020

   ContributorAuthor

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   [✓] Flutter (Channel master, v1.18.0-7.0.pre.47, on Mac OS X 10.15.4 19E287, locale en-GB)
       • Flutter version 1.18.0-7.0.pre.47 at /Users/danny/Dev/Google/flutter
       • Framework revision 240611b05e (4 days ago), 2020-04-23 11:54:02 -0400
       • Engine revision feb94f6c97
       • Dart version 2.9.0 (build 2.9.0-2.0.dev 64b8ded48b)
   
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   [✓] Connected device (4 available)
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   ! Doctor found issues in 1 category.
   
5. no-response

   removed

   waiting for responseThe Flutter team cannot make further progress on this issue until the original reporter respondsThe Flutter team cannot make further progress on this issue until the original reporter responds

   on Apr 27, 2020
6. DanTup commented on Apr 27, 2020

   

   DanTup

   on Apr 27, 2020

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   I think this might related to how Flutter compiles expressions - seems like it might pass them to Dart, and Dart expects a single line for the expression:

   https://github.com/dart-lang/sdk/blob/bd3d08a891791ac3b83a55bd6652ae0b995912e9/pkg/frontend_server/lib/frontend_server.dart#L1198

   And Flutter just writes the expression as-is:

   flutter/packages/flutter_tools/lib/src/compile.dart

   Line 763 in b7e30cf

   _server.stdin.writeln(request.expression);

   I'm not super familiar with this, @aam might know if this is on the right track.
7. aam commented on Apr 27, 2020

   

   aam

   on Apr 27, 2020

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   I think this might related to how Flutter compiles expressions - seems like it might pass them to Dart, and Dart expects a single line for the expression:

   Yeah, I think you are right!
8. iapicca

   added

   frameworkflutter/packages/flutter repository. See also f: labels.flutter/packages/flutter repository. See also f: labels.

   on Jul 1, 2020
9. pedromassangocode

   added

   toolAffects the "flutter" command-line tool. See also t: labels.Affects the "flutter" command-line tool. See also t: labels.

   passed first triage

   on Sep 2, 2020
10. HerrNiklasRaab commented on Nov 17, 2021

    

    HerrNiklasRaab

    on Nov 17, 2021

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    Any update on this? Seems like easy to fix?
11. goderbauer

    removed

    frameworkflutter/packages/flutter repository. See also f: labels.flutter/packages/flutter repository. See also f: labels.

    on Aug 30, 2022
12. yanngasner commented on May 4, 2023

    

    yanngasner

    on May 4, 2023

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    Hi there, anything planned to fix this?
    Thx!
13. flutter-triage-bot

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    team-toolOwned by Flutter Tool teamOwned by Flutter Tool team

    on Jul 8, 2023
14. Hixie

    removed

    passed first triage

    on Jul 8, 2023
15. christopherfujino

    added

    P3Issues that are less important to the Flutter projectIssues that are less important to the Flutter project

    triaged-toolTriaged by Flutter Tool teamTriaged by Flutter Tool team

    on Oct 16, 2023
16. matanlurey

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    tool-still-validIssues that have been deemed still valid as part of the Flutter Tools issue cleanup initiative.Issues that have been deemed still valid as part of the Flutter Tools issue cleanup initiative.

    team-devexpOwned by the Developer Experience teamOwned by the Developer Experience team

    fyi-toolFor the attention of Flutter Tool teamFor the attention of Flutter Tool team

    and removed

    team-toolOwned by Flutter Tool teamOwned by Flutter Tool team

    P3Issues that are less important to the Flutter projectIssues that are less important to the Flutter project

    on Jul 9, 2025
17. flutter-triage-bot

    removed

    fyi-toolFor the attention of Flutter Tool teamFor the attention of Flutter Tool team

    triaged-toolTriaged by Flutter Tool teamTriaged by Flutter Tool team

    on Jul 10, 2025
18. bkonyi

    added a commit that references this issue on Aug 7, 2026

    [flutter_tools] Use JSON_INPUT COMPILE_EXPRESSION for expression eval…

    ...

    45b1083
19. auto-submit

    closed this as completedin #190722on Aug 10, 2026
20. mboetger

    added a commit that references this issue on Aug 10, 2026

    [flutter_tools] Use JSON_INPUT COMPILE_EXPRESSION for expression eval…

    ...

    eed6f4b
21. github-actions commented on Aug 24, 2026

    

    github-actionsbot

    on Aug 24, 2026 – with GitHub Actions

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    This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.
22. github-actions

    locked as resolved and limited conversation to collaborators on Aug 24, 2026