diff --git a/src/utils.jl b/src/utils.jl
index 9815847..d83ed1b 100755
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -15,8 +15,10 @@ function get_args(func_def::Dict)
   kwarg_list = Vector{Symbol}()
   for arg in (func_def[:args]...,)
     arg_def = splitarg(arg)
-    push!(arg_list, arg_def[1])
-    arg_dict[arg_def[1]] = arg_def[3] ? Any : arg_dict[arg_def[1]] = arg_def[2]
+    if arg_def[1] != nothing
+      push!(arg_list, arg_def[1])
+      arg_dict[arg_def[1]] = arg_def[3] ? Any : arg_dict[arg_def[1]] = arg_def[2]
+    end
   end
   for arg in (func_def[:kwargs]...,)
     arg_def = splitarg(arg)
diff --git a/test/runtests.jl b/test/runtests.jl
index e954c02..1a950e1 100755
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -140,4 +140,46 @@ end
 @testset "test_continue" begin
   @test collect(test_continue()) == [1, 3, 4, 5, 6, 7, 8, 9, 10]
   @test collect(test_continue_double()) == [1, 3, 1, 3]
-end
\ No newline at end of file
+end
+
+@resumable function test_type_parameters(::Type{Int64}, start::Int64)
+  for i in start:start+3
+    @yield i
+  end
+end
+
+@resumable function test_type_parameters(::Type{Float64}, start::Int64)
+  for i in start:start+3
+    @yield float(i)
+  end
+end
+
+@testset "test_type_parameters" begin
+  @test collect(test_type_parameters(Int64, 1)) == [1, 2, 3, 4]
+  @test collect(test_type_parameters(Float64, 1)) == [1.0, 2.0, 3.0, 4.0]
+end
+
+@resumable function test_type_parameters_order(start::Int64, ::Type{T})::T where {T}
+  for i in start:start+3
+    @yield T(i)
+  end
+end
+
+@testset "test_type_parameters_order" begin
+  @test collect(test_type_parameters_order(1, Int64)) == [1, 2, 3, 4]
+  @test collect(test_type_parameters_order(1, Float64)) == [1.0, 2.0, 3.0, 4.0]  
+  @test typeof(first(test_type_parameters_order(1, ComplexF32))) == ComplexF32
+end
+
+@resumable function test_type_parameters_optional(start::Int64; t::Type{T}=Type{Int64})::T where {T}
+  for i in start:start+3
+    @yield T(i)
+  end
+end
+
+
+@testset "test_type_parameters_optional" begin
+  @test collect(test_type_parameters_optional(1, t=Int64)) == [1, 2, 3, 4]
+  @test collect(test_type_parameters_optional(1, t=Float64)) == [1.0, 2.0, 3.0, 4.0]  
+  @test typeof(first(test_type_parameters_optional(1, t=ComplexF32))) == ComplexF32
+end