cuarrays version check

Project.toml

@@ -13,6 +13,7 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
 NNlib = "872c559c-99b0-510c-b3b7-b6c96a88d5cd"
 NaNMath = "77ba4419-2d1f-58cd-9bb1-8ffee604a2e3"
+Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"

src/cuda/cuda.jl

@@ -1,6 +1,22 @@
 module CUDA
 
 using ..CuArrays
+using Pkg.TOML
+
+function version_check()
+  minor_version = 9
+  project = joinpath(dirname(pathof(CuArrays)), "../Project.toml")
+  project = TOML.parse(String(read(project)))
+  version = VersionNumber(get(project, "version", "0.0.0"))
+  if !(version.major == 0 && version.minor == minor_version)
+    @warn """
+    Flux is only supported with CuArrays v0.$minor_version.
+    Try running `] pin CuArrays@0.$minor_version`.
+    """
+  end
+end
+
+version_check()
 
 if !applicable(CuArray{UInt8}, undef, 1)
   (T::Type{<:CuArray})(::UndefInitializer, sz...) = T(sz...)