Check if new/0 is defined inside macro

Author: Vadim Tsvetkov

lib/algae/internal.ex

@@ -251,18 +251,22 @@ defmodule Algae.Internal do
   def default_value({{:., _, [String, :t]}, _, _}), do: ""
 
   def default_value({{:., _, [{_, _, adt}, :t]}, _, []}) do
-    if Kernel.function_exported?(Module.concat(adt), :new, 0) do
-      quote do: unquote(Module.concat(adt)).new()
-    else
-      quote do: nil
+    quote do
+      if Kernel.function_exported?(unquote(Module.concat(adt)), :new, 0) do
+        unquote(Module.concat(adt)).new()
+      else
+        nil
+      end
     end
   end
 
   def default_value({{:., _, [module, :t]}, _, []}) do
-    if Kernel.function_exported?(module, :new, 0) do
-      quote do: unquote(module).new()
-    else
-      quote do: nil
+    quote do
+      if Kernel.function_exported?(unquote(module), :new, 0) do
+        unquote(module).new()
+      else
+        nil
+      end
     end
   end