From 68dbb1d05fcd364923624d8adc1abc05cd7c99c0 Mon Sep 17 00:00:00 2001
From: Mark Kittisopikul <kittisopikulm@janelia.hhmi.org>
Date: Wed, 30 Dec 2020 18:25:04 -0500
Subject: [PATCH 1/2] Add range(start, stop, length)

---
 base/range.jl | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/base/range.jl b/base/range.jl
index b275e95c7c266..0468ba77d3507 100644
--- a/base/range.jl
+++ b/base/range.jl
@@ -47,7 +47,7 @@ function _colon(start::T, step, stop::T) where T
 end
 
 """
-    range(start[, stop]; length, stop, step=1)
+    range(start[, stop[, length]]; length, stop, step=1)
 
 Given a starting value, construct a range either by length or from `start` to `stop`,
 optionally with a given step (defaults to 1, a [`UnitRange`](@ref)).
@@ -59,6 +59,8 @@ automatically such that there are `length` linearly spaced elements in the range
 If `step` and `stop` are provided and `length` is not, the overall range length will be computed
 automatically such that the elements are `step` spaced.
 
+If `start`, `stop`, and `length` are specified by position, no keywords are permitted.
+
 Special care is taken to ensure intermediate values are computed rationally.
 To avoid this induced overhead, see the [`LinRange`](@ref) constructor.
 
@@ -84,6 +86,9 @@ julia> range(1, step=5, stop=100)
 julia> range(1, 10, length=101)
 1.0:0.09:10.0
 
+julia> range(1, 10, 101)
+1.0:0.09:10.0
+
 julia> range(1, 100, step=5)
 1:5:96
 ```
@@ -94,6 +99,9 @@ range(start; length::Union{Integer,Nothing}=nothing, stop=nothing, step=nothing)
 range(start, stop; length::Union{Integer,Nothing}=nothing, step=nothing) =
     _range2(start, step, stop, length)
 
+range(start, stop, length::Union{Integer,Nothing}) =
+    _range(start, nothing, stop, length)
+
 _range2(start, ::Nothing, stop, ::Nothing) =
     throw(ArgumentError("At least one of `length` or `step` must be specified"))
 

From fb1dad173a6ea69a53ed33b81f8c8d8bbe45e377 Mon Sep 17 00:00:00 2001
From: Mark Kittisopikul <kittisopikulm@janelia.hhmi.org>
Date: Sun, 3 Jan 2021 19:02:24 -0500
Subject: [PATCH 2/2] Add tests for range(start, stop, length)

---
 test/ranges.jl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/test/ranges.jl b/test/ranges.jl
index 6fcfc18b50529..a1f930d1e10a8 100644
--- a/test/ranges.jl
+++ b/test/ranges.jl
@@ -1610,6 +1610,17 @@ end
     @test_throws ArgumentError range(1, 100)
 end
 
+@testset "range wtih start, stop, and length" begin
+    for starts in [-1, 0, 1, 10]
+        for stops in [-2, 0, 2, 100]
+            for lengths in [2, 10, 100]
+                @test range(starts, stops, lengths) === range(starts, stop=stops, length=lengths)
+            end
+            @test range(starts, stops, nothing) === range(starts, stop=stops)
+        end
+    end
+end
+
 @testset "Reverse empty ranges" begin
     @test reverse(1:0) === 0:-1:1
     @test reverse(Base.OneTo(0)) === 0:-1:1