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fix doug version with ReaderT #294

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fix doug version with ReaderT #294

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4 changes: 2 additions & 2 deletions book/FPLean/MonadTransformers/ReaderIO.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -395,10 +395,10 @@ Indeed, it is enough to define {anchorName showFileAndDir}`showFileName` and {an

```anchor showFileAndDir
def showFileName (file : String) : ConfigIO Unit := do
IO.println s!"{(← read).currentPrefix} {file}"
IO.println ((← read).fileName file)

def showDirName (dir : String) : ConfigIO Unit := do
IO.println s!"{(← read).currentPrefix} {dir}/"
IO.println ((← read).dirName dir)
```

One final operation from the original {anchorName ConfigIO}`ConfigIO` remains to be translated to a use of {anchorName MyReaderT}`ReaderT`: {anchorName locally}`locally`.
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4 changes: 2 additions & 2 deletions examples/douglib/DirTree.lean
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Expand Up @@ -258,10 +258,10 @@ instance : MonadLift m (ReaderT ρ m) where

-- ANCHOR: showFileAndDir
def showFileName (file : String) : ConfigIO Unit := do
IO.println s!"{(← read).currentPrefix} {file}"
IO.println ((← read).fileName file)

def showDirName (dir : String) : ConfigIO Unit := do
IO.println s!"{(← read).currentPrefix} {dir}/"
IO.println ((← read).dirName dir)
-- ANCHOR_END: showFileAndDir


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