max/lean4-htt
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 2

doc: missing (type := true) in reader monad example (#6196)

Browse source 
This PR adds missing `(types := true)` to `#reduce` example in [Readers
example](https://lean-lang.org/lean4/doc/monads/readers.lean.html).
Since [4.10](https://lean-lang.org/blog/2024-8-1-lean-4100/) the `(types
:= true)` is necessary for the `ReaderM Environment String` type to be
reduced into `Environment → String`.
This commit is contained in:
jsr-p 2024-12-07 16:59:36 +01:00 • committed by GitHub
parent 6447fda253
commit 762c5758f5
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
doc/monads/readers.lean
View file

@ -139,7 +139,7 @@ You might be wondering, how does the context actually move through the `ReaderM`
add an input argument to a function by modifying its return type? There is a special command in
Lean that will show you the reduced types:
-/
#reduce ReaderM Environment String -- Environment → String
#reduce (types := true) ReaderM Environment String -- Environment → String
/-!
And you can see here that this type is actually a function! It's a function that takes an
`Environment` as input and returns a `String`.
@ -196,4 +196,4 @@ entirely.
Now it's time to move on to [StateM Monad](states.lean.md) which is like a `ReaderM` that is
also updatable.
-/
-/