remove last, fix test warning

src/itertools.jl

@@ -2,18 +2,6 @@ repeatedly(f) = (f() for _ in Iterators.repeated(nothing))
 
 repeatedly(f, n::Integer) = (f() for _ = 1:n)
 
-function last(itr)
-    res = iterate(itr)
-    if res === nothing
-        throw(ArgumentError("iterator must be non-empty"))
-    end
-    output, state = res
-    for elem in Iterators.rest(itr, state)
-        output = elem
-    end
-    return output
-end
-
 mutable struct Settable{T}
     v::T
 end

test/test_models.jl

@@ -5,6 +5,15 @@ using Serialization
 using Statistics
 using Test
 
+struct CustomModel <: Model
+    m1::Any
+    act1::Any
+    m2::Any
+    act2::Any
+end
+
+(m::CustomModel)(x) = (m.act2 ∘ m.m2 ∘ m.act1 ∘ m.m1)(x)
+
 @testset "Basic operations" begin
     @testset "$(T)" for T in [Float16, Float32, Float64]
         @testset "$(name)" for (name, m) in [
@@ -177,15 +186,6 @@ end
     end
 
     @testset "Custom ($(T))" for T in [Float32, Float64]
-        struct CustomModel <: Model
-            m1::Any
-            act1::Any
-            m2::Any
-            act2::Any
-        end
-
-        (m::CustomModel)(x) = (m.act2 ∘ m.m2 ∘ m.act1 ∘ m.m1)(x)
-
         input_size, hidden_size, output_size = 1000, 50, 1
         batch_size = 64