Update src/ArrayInterface.jl

Author: ChrisRackauckas

src/ArrayInterface.jl

@@ -12,7 +12,7 @@ function ismutable end
 Query whether a type is mutable or not, see
 https://github.com/JuliaDiffEq/RecursiveArrayTools.jl/issues/19.
 """
-ismutable(x) = (@show x; ismutable(typeof(x)))
+ismutable(x) = ismutable(typeof(x))
 
 ismutable(::Type{<:AbstractArray}) = true
 ismutable(::Type{<:Number}) = false