fixup! fixup! datadeps: Add at-stencil helper

Author: jpsamaroo

test/array/stencil.jl

@@ -121,6 +121,7 @@ function test_stencil()
 
     @testset "Invalid neighborhood distance" begin
         A = ones(Blocks(1, 1), Int, 2, 2)
+        B = zeros(Blocks(1, 1), Int, 2, 2)
         @test_throws ArgumentError Dagger.spawn_datadeps() do
             @stencil begin
                 B[idx] = sum(@neighbors(A[idx], 0, Wrap()))