Fix #239 (#240)

* Fix #239

Author: Tokazama

Project.toml

@@ -1,6 +1,6 @@
 name = "ArrayInterface"
 uuid = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"
-version = "4.0.1"
+version = "4.0.2"
 
 [deps]
 Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"

src/ranges.jl

@@ -358,13 +358,13 @@ end
 
 Base.eachindex(r::OptionallyStaticRange) = One():static_length(r)
 @inline function Base.iterate(r::OptionallyStaticRange)
-    isempty(r) && return missing
+    isempty(r) && return nothing
     fi = Int(first(r));
     fi, fi
 end
 function Base.iterate(::SUnitRange{F,L}) where {F,L}
     if L::Int < F::Int
-        return missing
+        return nothing
     else
         return (F::Int, F::Int)
     end
@@ -374,7 +374,7 @@ function Base.iterate(::SOneTo{n}, s::Int) where {n}
         s2 = s + 1
         return (s2, s2)
     else
-        return missing
+        return nothing
     end
 end
 

test/ranges.jl

@@ -51,6 +51,10 @@
         @test reverse(static(1):static(2):static(9)) === static(9):static(-2):static(1)
     end
 
+    # iteration
+    @test iterate(static(1):static(5), 5) === nothing
+    @test iterate(static(2):static(5), 5) === nothing
+
     @test ismissing(@inferred(ArrayInterface.known_first(typeof(1:4))))
     @test isone(@inferred(ArrayInterface.known_first(Base.OneTo(4))))
     @test isone(@inferred(ArrayInterface.known_first(typeof(Base.OneTo(4)))))