tighter fill! non-diff

Author: mcabbott

src/rulesets/Base/nondiff.jl

@@ -41,8 +41,8 @@
 @non_differentiable eachcol(::AbstractArray{Bool})
 @non_differentiable eachrow(::AbstractArray{Bool})
 @non_differentiable eachslice(::AbstractArray{Bool})
-@non_differentiable fill(::AbstractArray{Bool})
-@non_differentiable fill!(::AbstractArray, ::Any)
+@non_differentiable fill(::Bool, ::Any...)
+@non_differentiable fill!(::AbstractArray{Bool}, ::Any)
 @non_differentiable findprev(::AbstractArray{Bool}, ::Any)
 @non_differentiable findprev(::Any, ::AbstractArray{Bool}, ::Any)
 @non_differentiable getindex(::AbstractArray{Bool}, ::Any...)