Compiler, language server hangs

[AsbjornOlling]

if I run roc test A.roc on this file, it hangs forever, using 100% of one core:

interface A
    exposes [a]
    imports [b.C]

a = 2

If I remove b.C from the imports (or uncomment it), roc test A.roc correctly terminates with "No expectations were found."

roc build, roc dev, roc test, and roc check all exhibit the same behavior, also on any other files that import A.roc
The roc_ls that my emacs mode started even does the same.. hangs using 100% on one core.

Feels related to #6181

Using roc from commit 7b1c009ca2bb07dc10a80136c1dccfc4de9996d2

[AsbjornOlling]

Hmm it really seems to have something to do with imports.
It terminates if there are no imports. It hangs if I have imports [ b.C ]

[AsbjornOlling]

#6178 also sounds similar

[AsbjornOlling]

...but if I just do import [ B ] it fails (correctly) immediately, saying that it can't find B.roc

If I then put an actual roc interface file at B.roc, it compiles successfully - expectations pass and everything.

but import [ a.B ] still hangs.

[AsbjornOlling]

FWIW, I tried going back in the roc repo history to see how far back I can reproduce this bug, and the bug seems to be older than one year, and probably also older than the first commit where nix build works in the repo flake 😅

[agu-z]

@AsbjornOlling The root issue here is that we don't currently have a way to know what the package's shorthand b refers to from the perspective of an interface module.

We are discussing adding a CLI flag to let you specify the app or package.

In the meantime, you can run roc test from your app module and it should run the tests for all the modules it imports.