On-the-spot compile error message in Helix?

hx --health zig shows me my env is perfectly configured.
But how can I setup my helix to show what I can see from @kristoff 's video stream?
In his stream, the compile error message (maybe from zls? or zig --ast-check?) shows up next to each line as he types in.
How can I do this?

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do you have a check step configured in build.zig? Here’s Loris blog post about it:

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This is what I was looking for. Thanks a lot!!!

zig-helix

how to work with Hélix, zig, zls

it’s not perfect, but very easy to modify.

Hand-stitched, so very malleable.