fix: doctests. add doctests for zip_longest too.

docs/make.jl

@@ -1,12 +1,13 @@
 using Documenter, IterTools
 
+DocMeta.setdocmeta!(IterTools, :DocTestSetup, :(using IterTools))
 makedocs(
     modules = [IterTools],
     sitename = "IterTools",
     pages = [
         "Docs" => "index.md",
         ],
-    doctest=false,
+    doctest=true,
    )
 
 deploydocs(

docs/src/index.md

@@ -1,9 +1,3 @@
-```@meta
-DocTestSetup = quote
-    using IterTools
-end
-```
-
 # IterTools
 
 ## Installation

src/IterTools.jl

@@ -1106,12 +1106,12 @@ Input:
 ```jldoctest
 julia> collect(interleaveby(1:2:5, 2:2:6))
 6-element Vector{Int64}:
-  1
-  2
-  3
-  4
-  5
-  6
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
 ```
 
 If the predicate is `Base.isless` (the default) and both inputs are sorted, this produces the sorted output.
@@ -1215,6 +1215,25 @@ _zip_longest_promote_shape(a, b) = promote_shape(a, b)
 For one or more iterable objects, return an iterable of tuples, where the `i`th tuple
 contains the `i`th component of each input iterable if it is not finished, and `default`
 otherwise. `default` can be a scalar, or a tuple with one default per iterable.
+
+```jldoctest
+julia> for t in zip_longest(1:2, 5:8)
+         @show t
+       end
+t = (1, 5)
+t = (2, 6)
+t = (nothing, 7)
+t = (nothing, 8)
+
+julia> for t in zip_longest('a':'e', ['m', 'n']; default='x')
+         @show t
+       end
+t = ('a', 'm')
+t = ('b', 'n')
+t = ('c', 'x')
+t = ('d', 'x')
+t = ('e', 'x')
+```
 """
 zip_longest(its...; default=nothing) = ZipLongest(Tuple(_Padded.(its, default)))