Fix witchcrafters#75

florius0 · Jun 18, 2022 · ae05f35 · ae05f35
1 parent 8e9e248
commit ae05f35
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/lib/algae/internal.ex b/lib/algae/internal.ex
@@ -251,11 +251,19 @@ defmodule Algae.Internal do
   def default_value({{:., _, [String, :t]}, _, _}), do: ""
 
   def default_value({{:., _, [{_, _, adt}, :t]}, _, []}) do
-    quote do: unquote(Module.concat(adt)).new()
+    if Kernel.function_exported?(Module.concat(adt), :new, 0) do
+      quote do: unquote(Module.concat(adt)).new()
+    else
+      quote do: nil
+    end
   end
 
   def default_value({{:., _, [module, :t]}, _, []}) do
-    quote do: unquote(module).new()
+    if Kernel.function_exported?(module, :new, 0) do
+      quote do: unquote(module).new()
+    else
+      quote do: nil
+    end
   end
 
   def default_value([_]), do: []