tweag
Transitive re-exporting does not work
Describe the bug
When there are at least two levels of re-exporting, the innermost modules do not get exported.
To Reproduce Consider the following example:
haskell_library(
name = "lib",
exports = [
":a",
":b",
":c",
],
deps = [
":a",
":b",
":c",
],
)
haskell_library(
name="pipeline",
exports = [":lib"],
deps=[
"@hackage//:aeson",
":lib",
]
haskell_binary(
name="exe",
srcs=["src/Main.hs"],
deps=[
"@hackage//:base",
":pipeline",
],
)
The above will fail upon building with this error:
src/Main.hs:21:1: error:
Could not load module ‘A’
It is a member of the hidden package ‘a’.
You can run ‘:set -package a’ to expose it.
(Note: this unloads all the modules in the current scope.)
Use -v to see a list of the files searched for.
|
21 | import qualified A as A
where A.hs is a Haskell source file of the library ":a"
Everything works fine when ":lib" is added to the deps of the haskell binary.
Expected behavior
We shouldn't have to add ":lib" to the deps of the haskell binary since it's already re-exported by ":pipeline"
Environment
- OS name + version: Ubuntu 19.10
- Bazel version: "Build label: 0.28.0- (@non-git)"
- Version of the rules: "23c6b64cae7db676485a1e401698520f4cdd8254"
At a cursory look, fixing this will probably require tracking exports transitively here instead of just the direct exports. This should probably be done by using a depset instead of a list to track these.
@prednaz was this resolved by #2125? If so, please close. :slightly_smiling_face:
