haskell - 查找 ghc 的 -Wmissing-import-lists 的显式导入

Question

当存在隐式导入时，GHC 会生成警告(见下文)。目标是用显式导入替换这些。是否有自动生成列表的方法(而不是在代码中手动查找)？

/Users/srid/code/slownews/backend/src/SlowNews/Main.hs:10:1: warning: [-Wmissing-import-lists]
    The module ‘Control.Exception’ does not have an explicit import list
   |
10 | import           Control.Exception
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

/Users/srid/code/slownews/backend/src/SlowNews/Main.hs:13:1: warning: [-Wmissing-import-lists]
    The module ‘Control.Monad.IO.Class’ does not have an explicit import list
   |
13 | import           Control.Monad.IO.Class
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Answer 1

GHC 有一个 -ddump-minimal-imports可以解决问题的标志。