Recursively process fill components

Author: jishnub

src/fillbroadcast.jl

@@ -119,6 +119,7 @@ _isfill(f::Ref) = true
 _isfill(::Any) = false
 
 _broadcast_maybecopy(bc::Broadcast.Broadcasted{<:AbstractFillStyle}) = copy(bc)
+_broadcast_maybecopy(bc::Broadcast.Broadcasted) = Broadcast.broadcasted(bc.f, map(_broadcast_maybecopy, bc.args)...)
 _broadcast_maybecopy(x) = x
 
 function _fallback_copy(bc)

test/runtests.jl

@@ -1214,6 +1214,8 @@ end
     @testset "early binding" begin
         A = ones(2) .+ (x -> rand()).(Fill(2,2))
         @test all(==(A[1]), A)
+        A = ones(1,5) .+ (ones(1) .+ (_ -> rand()).(Fill("vec", 2)))
+        @test all(==(A[1]), A)
     end
 end