Define adapt_structure for CartesianIndices

Author: charleskawczynski

src/base.jl

@@ -83,3 +83,7 @@ adapt_structure(to, r::Base.Slice) = Base.Slice(adapt(to, r.indices))
 
 adapt_structure(to, r::LinRange) =
   LinRange(adapt(to, r.start), adapt(to, r.stop), r.len)
+
+## CartesianIndices
+
+adapt_structure(to, ci::CartesianIndices) = ci

test/runtests.jl

@@ -255,3 +255,7 @@ end
     @test adapt(Array, Base.Slice(1:10)) === Base.Slice(1:10)
     @test adapt(Array, LinRange(1,2,10)) === LinRange(1,2,10)
 end
+
+@testset "CartesianIndices" begin
+    @test adapt(Array, CartesianIndices((1,2,3))) === CartesianIndices((1,2,3))
+end