I want to add ViewPatterns extensions to my build and currently I do it by adding the following lines to package.yaml
ghc-options:
- -Wall
- -XViewPatterns
I get a warning:
Warning: Instead of 'ghc-options: -XViewPatterns' use 'extensions:
ViewPatterns'
But, when I add an extensions
field to package.yaml, I get the following:
WARNING: Ignoring unknown field "extensions" in package description
Also, I could not find any definition of extensions
in the official stack documentation.
Do not confuse stack with hpack .
package.yaml
is actually read by hpack. But stack build
command implicitly calls hpack to automatically convert into a cabal file, which may make you confused.
Anyway, to specify extensions in package.yaml, use default-extensions
:
default-extensions: ViewPatterns
extensions:
目前不支持堆栈,请参阅此github 问题中的后续内容。
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