Use oneto in CartesianIndices when given sizes (#50534)

Author: jishnub

base/multidimensional.jl

@@ -267,7 +267,7 @@ module IteratorsMD
     CartesianIndices(A::AbstractArray) = CartesianIndices(axes(A))
 
     _convert2ind(sz::Bool) = Base.OneTo(Int8(sz))
-    _convert2ind(sz::Integer) = Base.OneTo(sz)
+    _convert2ind(sz::Integer) = Base.oneto(sz)
     _convert2ind(sz::AbstractUnitRange) = first(sz):last(sz)
     _convert2ind(sz::OrdinalRange) = first(sz):step(sz):last(sz)
 

test/abstractarray.jl

@@ -2,6 +2,9 @@
 
 using Random, LinearAlgebra
 
+isdefined(Main, :InfiniteArrays) || @eval Main include("testhelpers/InfiniteArrays.jl")
+using .Main.InfiniteArrays
+
 A = rand(5,4,3)
 @testset "Bounds checking" begin
     @test checkbounds(Bool, A, 1, 1, 1) == true
@@ -56,6 +59,13 @@ end
     @test checkbounds(Bool, A, CartesianIndex((5,)), CartesianIndex((4,)), CartesianIndex((4,)))  == false
 end
 
+@testset "Infinite CartesianIndices" begin
+    r = OneToInf()
+    C = CartesianIndices(size(r))
+    ax = to_indices(r, (C,))[1]
+    @test ax === r
+end
+
 @testset "vector indices" begin
     @test checkbounds(Bool, A, 1:5, 1:4, 1:3) == true
     @test checkbounds(Bool, A, 0:5, 1:4, 1:3) == false