From 1a1d12ef776b9135606273c4f0d9166434f92024 Mon Sep 17 00:00:00 2001
From: pdeffebach <p.deffebach@gmail.com>
Date: Wed, 1 Apr 2020 09:14:50 -0400
Subject: [PATCH] tests and docs

---
 src/Missings.jl  | 3 ++-
 test/runtests.jl | 8 +++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/Missings.jl b/src/Missings.jl
index 1262947..f838b9a 100644
--- a/src/Missings.jl
+++ b/src/Missings.jl
@@ -213,7 +213,8 @@ passmissing(f) = PassMissing{Core.Typeof(f)}(f)
    skipmissings(args...)
 
 Return a tuple of iterators wrapping each of the iterators in `args`, but
-skipping elements at positions where at least one of the iterators returns `missing`.
+skipping elements at positions where at least one of the iterators returns `missing`
+(listwise deletion of missing values).
 
 # Examples
 ```
diff --git a/test/runtests.jl b/test/runtests.jl
index db9bb5b..bd0b6c8 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -105,7 +105,10 @@ struct CubeRooter end
     @test_throws MissingException mx[1]
     @test reduce(+, mx) === 18
     @test isapprox(mapreduce(cos, *, collect(mx)),  mapreduce(cos, *, mx))
-    @inferred Union{Float64, Missing} mapreduce(cos, *, mx)
+    if VERSION >= v"1.4.0-DEV"
+        @inferred Union{Float64, Missing} mapreduce(cos, *, mx)
+    end
+
     x = [missing missing missing]
     y = [1, 2, 3]
     mx, my = skipmissings(x, y)
@@ -118,6 +121,9 @@ struct CubeRooter end
     mx, my = skipmissings(x, y)
     @test sum(mx) === 1056
     @inferred Union{Missing, Int} sum(mx)
+    if VERSION >= v"1.4.0-DEV"
+        @inferred Union{Missing, Int} sum(mx)
+    end
 
     @test levels(1:1) == levels([1]) == levels([1, missing]) == levels([missing, 1]) == [1]
     @test levels(2:-1:1) == levels([2, 1]) == levels([2, missing, 1]) == [1, 2]