Hidden package hints no longer display
This started as a mailing list thread: https://mail.haskell.org/pipermail/haskell-cafe/2018-January/128485.html. Dan Burton demonstrated a reproduction without any build tool.
With GHC 8.0.2, when you try to use a module from a hidden package, you get an error message with a helpful hint to add the package to the build-depends. With GHC 8.2.2 (and I believe 8.2.1), it appears that this hint is no longer displayed. To demonstrate, I'll copy Dan's repro:
$ cat Main.hs
module Main where
import Data.Map
main = putStrLn "It compiles"
$ ghc-pkg list containers
/usr/local/Cellar/ghc/8.2.2/lib/ghc-8.2.2/package.conf.d
containers-0.5.10.2
$ ghc --make -hide-all-packages -package base Main.hs
[1 of 1] Compiling Main ( Main.hs, Main.o )
Main.hs:2:1: error:
Could not find module ‘Data.Map’
Use -v to see a list of the files searched for.
|
2 | import Data.Map
| ^^^^^^^^^^^^^^^
$ ghc --make -hide-all-packages -package base -package containers Main.hs
[1 of 1] Compiling Main ( Main.hs, Main.o )
Linking Main ...Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.2.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
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| Related | |
| Blocking | |
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