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Ghc 45102 #529
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| **/dist-newstyle/* |
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message-index/messages/GHC-45102/example1/after/cabal.project
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| packages: fruits/ | ||
| packages: vegatables/ | ||
| packages: salad/ |
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message-index/messages/GHC-45102/example1/after/fruits/Tomatoes.hs
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| module Tomatoes where |
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message-index/messages/GHC-45102/example1/after/fruits/fruits.cabal
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| cabal-version: 3.0 | ||
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| name: fruits | ||
| version: 0.0.1 | ||
| license: MIT | ||
| author: Jappie | ||
| maintainer: [email protected] | ||
| build-type: Simple | ||
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| library | ||
| exposed-modules: Tomatoes | ||
| build-depends: base | ||
| default-language: Haskell2010 |
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message-index/messages/GHC-45102/example1/after/salad/Salad.hs
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| {-# LANGUAGE PackageImports #-} | ||
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| module Salad where | ||
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| import "vegetables" Tomatoes |
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message-index/messages/GHC-45102/example1/after/salad/salad.cabal
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| cabal-version: 3.0 | ||
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| name: salad | ||
| version: 0.0.1 | ||
| license: MIT | ||
| author: Jappie | ||
| maintainer: [email protected] | ||
| build-type: Simple | ||
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| library | ||
| exposed-modules: Salad | ||
| build-depends: base, fruits, vegetables | ||
| default-language: Haskell2010 |
1 change: 1 addition & 0 deletions
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message-index/messages/GHC-45102/example1/after/vegatables/Tomatoes.hs
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| module Tomatoes where |
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message-index/messages/GHC-45102/example1/after/vegatables/vegetables.cabal
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| cabal-version: 3.0 | ||
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| name: vegetables | ||
| version: 0.0.1 | ||
| license: MIT | ||
| author: Jappie | ||
| maintainer: [email protected] | ||
| build-type: Simple | ||
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| library | ||
| exposed-modules: Tomatoes | ||
| build-depends: base | ||
| default-language: Haskell2010 |
3 changes: 3 additions & 0 deletions
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message-index/messages/GHC-45102/example1/before/cabal.project
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,3 @@ | ||
| packages: fruits/ | ||
| packages: vegatables/ | ||
| packages: salad/ |
1 change: 1 addition & 0 deletions
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message-index/messages/GHC-45102/example1/before/fruits/Tomatoes.hs
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| module Tomatoes where |
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message-index/messages/GHC-45102/example1/before/fruits/fruits.cabal
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| cabal-version: 3.0 | ||
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| name: fruits | ||
| version: 0.0.1 | ||
| license: MIT | ||
| author: Jappie | ||
| maintainer: [email protected] | ||
| build-type: Simple | ||
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| library | ||
| exposed-modules: Tomatoes | ||
| build-depends: base | ||
| default-language: Haskell2010 |
3 changes: 3 additions & 0 deletions
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message-index/messages/GHC-45102/example1/before/salad/Salad.hs
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| module Salad where | ||
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| import Tomatoes |
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message-index/messages/GHC-45102/example1/before/salad/salad.cabal
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,13 @@ | ||
| cabal-version: 3.0 | ||
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| name: salad | ||
| version: 0.0.1 | ||
| license: MIT | ||
| author: Jappie | ||
| maintainer: [email protected] | ||
| build-type: Simple | ||
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| library | ||
| exposed-modules: Salad | ||
| build-depends: base, fruits, vegetables | ||
| default-language: Haskell2010 |
1 change: 1 addition & 0 deletions
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message-index/messages/GHC-45102/example1/before/vegatables/Tomatoes.hs
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| module Tomatoes where |
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message-index/messages/GHC-45102/example1/before/vegatables/vegetables.cabal
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| cabal-version: 3.0 | ||
|
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| name: vegetables | ||
| version: 0.0.1 | ||
| license: MIT | ||
| author: Jappie | ||
| maintainer: [email protected] | ||
| build-type: Simple | ||
|
|
||
| library | ||
| exposed-modules: Tomatoes | ||
| build-depends: base | ||
| default-language: Haskell2010 |
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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: Lambda syntax in `case` expression | ||
| --- | ||
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| When pattern matching with a `case` expression, backslash (`\`) is not required before the pattern. | ||
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| ## Error Message | ||
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| ```haskell | ||
| LambdaInCase.hs:6:5: error: [GHC-00482] | ||
| Lambda-syntax in pattern. | ||
| Pattern matching on functions is not possible. | ||
| | | ||
| 6 | \a -> a | ||
| | ^^^^^^^ | ||
| ``` | ||
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| --- | ||
| title: Ambiguous module name from multiple packages | ||
| summary: A module with the same name was exported from multiple packages | ||
| severity: error | ||
| introduced: 9.6.1 | ||
| --- | ||
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| When two packages export a module of the same name, ghc doesn't know which you | ||
| want to import. | ||
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| The solution is to use package import. | ||
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| So if we've two packages: | ||
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| + package fruits exports tomatoes: | ||
| ```haskell | ||
| module Tomatoes where | ||
| ``` | ||
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| + and package vegetables exports tomatoes: | ||
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| ```haskell | ||
| module Tomatoes where | ||
| ``` | ||
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| then our package salad program will cause an error: | ||
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| ``` | ||
| module Salad where | ||
| import Tomatoes | ||
| ``` | ||
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| The solution is to be specific with package imports: | ||
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| ``` | ||
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| {-# LANGUAGE PackageImports #-} | ||
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| module Salad where | ||
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| import "vegetables" Tomatoes | ||
| ``` | ||
|
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| alternatively you could patch the upstream libraries, | ||
| but package imports is usually easiest. |
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Is it related to GHC-45102? Seems like a rebase artifact.