Trying to write a macro

Error when running mirahc

Parsing...
  macro.mirah
Inferring types...
Inference Error:
Could not infer typing for nodes:
  FunctionalCall(find_class)
 Call(parent)
  Field(call) at line 14 (child of LocalAssignment(name = class_node, scope = MethodDefinition(_expand), captured = false))
macro.mirah:12: Could not infer typing for nodes:
  FunctionalCall(find_class)
 Call(parent)
  Field(call) at line 14 (child of LocalAssignment(name = class_node, scope = MethodDefinition(_expand), captured = false))
  macro def do_something
^^^^^^^^^^^^^^^^^^^^^^^^^
    class_node = find_class(@call.parent)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    class_name = class_node.string_value
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    quote do
^^^^^^^^^^^^^
        def `"blah_#{class_name}"`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
            x = 2
^^^^^^^^^^^^^^^^^^
        end
^^^^^^^^^^^^
    end
^^^^^^^^
  end
^^^^^
Cannot find instance method do_something() on Foo
macro.mirah:22: Cannot find instance method do_something() on Foo
  do_something
^^^^^^^^^^^^^^

gistfile1.duby

import duby.lang.compiler.ClassDefinition
import duby.lang.compiler.Node

class Foo
  def find_class(node:Node):ClassDefinition
    while node && !node.kind_of?(ClassDefinition)
      node = node.parent
    end
    ClassDefinition(node)
  end

  macro def do_something
    class_node = find_class(@call.parent)
    class_name = class_node.string_value
    quote do
        def `"blah_#{class_name}"`
            x = 2
        end
    end
  end
  
  do_something
end