private MutableMethodInfo ImplementIntroducedMethod(
Expression implementer, MethodInfo interfaceMethod, MethodDefinition implementingMethod, MemberVisibility visibility)
{
var method = visibility == MemberVisibility.Public
? _concreteTarget.GetOrAddImplementation(interfaceMethod)
: _concreteTarget.AddExplicitOverride(interfaceMethod, ctx => Expression.Default(ctx.ReturnType));
method.SetBody(ctx => _expressionBuilder.CreateInitializingDelegation(ctx, _initializationMethod, implementer, interfaceMethod));
_attributeGenerator.AddIntroducedMemberAttribute(method, interfaceMethod, implementingMethod);
_attributeGenerator.ReplicateAttributes(implementingMethod, method);
return(method);
}