JuliaPluto/Pluto.jl

CheckBox() not working in session after coding error

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#486 opened on Sep 24, 2020

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bugexpression explorergood first issue

Description

Hi!

I was using CheckBox() from PlutoUI but I accidentally wrote $(@bind cost1 CheckBox(), default=true) instead of $(@bind cost1 CheckBox(default=true)) and apparently you can't use CheckBoxes anymore in that session (even if removing that line of code in the cell) so I had to restart the session. The error is

┌ Warning: unknow use of `=`. Assignee is unrecognised.
│   ex = :(CheckBox())
└ @ Pluto.ExpressionExplorer ~/.julia/packages/Pluto/upwxH/src/analysis/ExpressionExplorer.jl:160

Contributor guide

Tech stack
None
Domain
developer experience
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
None
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The error occurs in ExpressionExplorer.jl line 160 where an unknown use of `=` is warned. Investigate how Pluto handles malformed `$(@bind ...)` expressions and why it corrupts the session. Consider adding a fix to gracefully handle such errors without requiring a session restart. The linked issue has no additional comments, so the maintainer's expected behavior is not yet clarified.