Brian Carroll (Aug 02 2023 at 13:57): Brian Carroll (Aug 02 2023 at 13:57):This used to work in the web REPL, but now it is incorrectly identified as an error.
x = 4
y = 5
x+y
This produces the error message below, but I don't think it should!
⚠️ This web REPL misses some features that are available in the CLI (roc repl) like defining variables without a final expression, which will result in the "Missing Final Expression" error.
But what I typed in does have a final expression. This should work fine, and used to!
I think whatever is checking for this condition is too strict.
Anton (Aug 02 2023 at 14:09):The ":warning:️ This web REPL misses som..." message is always present, it's static HTML.
Anton (Aug 02 2023 at 14:10):The CSS makes it so that you need to scroll to see it, which is not ideal. I'll make an issue for that.
Anton (Aug 02 2023 at 14:15): Himanshu Kumar (Aug 02 2023 at 15:56):Hi anton, I would like to contribute on this issue(#5724). I am new to open source and would like to know how to run the project after making changes.
Anton (Aug 02 2023 at 16:09):Hi @Himanshu Kumar,
Welcome to open source development :)
I've confirmed that your PR works through live editing https://www.roc-lang.org/repl in the browser.
Thanks for your help!
Brian Carroll (Aug 02 2023 at 16:35):Anton said:
The ":warning:️ This web REPL misses som..." message is always present, it's static HTML.
Oh I see! I thought the error was persisting for some reason!
Brian Carroll (Aug 02 2023 at 16:37):Ok well the CSS fix is great but the problem with definitions is still there!
Brian Carroll (Aug 02 2023 at 16:38):They should work as long as there is a final expression but they don't.
Brian Carroll (Aug 02 2023 at 16:40):So this broke at some point.
Brian Carroll (Aug 02 2023 at 16:42):That HTML warning is about a feature we haven't implemented. But that is not what I intended to discuss in this thread.
What I'm saying is that the expected behaviour is broken.
What work has been done in the last few months that could cause a bug in the web REPL?
Folkert de Vries (Aug 02 2023 at 16:44):parser changes?
Brian Carroll (Aug 02 2023 at 16:48):Could be, I suppose.
Brian Carroll (Aug 02 2023 at 16:49):At this stage I think if we're going to fix it, it'll be a matter of making it work like the CLI repl rather than restoring the old behaviour.
Brian Carroll (Aug 02 2023 at 17:35):@Himanshu Kumar if you want to run the web REPL locally there are instructions here:
https://github.com/roc-lang/roc/blob/main/crates/repl_wasm/README.md
Ayaz Hafiz (Aug 02 2023 at 18:30):Richard also overhauled the state transitions in the repl so that is also a possible source
Richard Feldman (Aug 02 2023 at 20:51):the state transition stuff is only used in the CLI repl at the moment
Anton (Aug 04 2023 at 07:47):Your snippet works for me @Brian Carroll
x = 4
y = 5
x+y
Screenshot_20230804_094530.png
Could something be cached on your end?
Brian Carroll (Aug 04 2023 at 13:03):Yes, that works for me when I copy and paste it in! Thanks for testing.
:thinking:
The other day, I was having trouble with "up arrow" navigation, trying to fix a typo in the expression
When you have multiline input it's hard to go back to it and edit it
The up arrow takes you to the previous input - there's no way to go up or down within a single multiline expression.
So in the end, I think this is really a UI issue with multiline editing
Last updated: Jul 26 2025 at 12:14 UTC