9.2.1 regression: compile of import of module installed by cabal install fails
9.2.1 regression: After installing the vector package, compile of file with "import Data.Vector" fails:
ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.2.1
bash-3.2$ cabal --version
cabal-install version 3.4.0.0
compiled using version 3.4.0.0 of the Cabal library
bash-3.2$ cabal install vector --lib
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
Resolving dependencies...
Build profile: -w ghc-9.2.1 -O1
In order, the following will be built (use -v for more details):
- primitive-0.7.3.0 (lib) (requires download & build)
- vector-0.12.3.1 (lib) (requires download & build)
Downloading primitive-0.7.3.0
Downloaded primitive-0.7.3.0
Downloading vector-0.12.3.1
Starting primitive-0.7.3.0 (lib)
Downloaded vector-0.12.3.1
Building primitive-0.7.3.0 (lib)
Installing primitive-0.7.3.0 (lib)
Completed primitive-0.7.3.0 (lib)
Starting vector-0.12.3.1 (lib)
Building vector-0.12.3.1 (lib)
Installing vector-0.12.3.1 (lib)
Completed vector-0.12.3.1 (lib)
bash-3.2$ cat buggc.hs
import Data.Vector
main = undefined
bash-3.2$ ghc buggc.hs
[1 of 1] Compiling Main ( buggc.hs, buggc.o )
buggc.hs:2:1: error:
Could not find module ‘Data.Vector’
Perhaps you meant Data.Functor (from base-4.16.0.0)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
2 | import Data.Vector
| ^^^^^^^^^^^^^^^^^^
bash-3.2$ sw_vers
ProductName: macOS
ProductVersion: 12.0.1
BuildVersion: 21A559
This worked in ghc 9.0.1. The workaround is to do "cabal v1-install vector". Since the version of Cabal used in both cases is the same I filed the bug against ghc as that is what changed.
Edited by george.colpitts