gistfile1.txt

diff --git a/lib/Mojo/Promise.pm b/lib/Mojo/Promise.pm
index 19fdd8617..a84ff6006 100644
--- a/lib/Mojo/Promise.pm
+++ b/lib/Mojo/Promise.pm
@@ -2,6 +2,7 @@ package Mojo::Promise;
 use Mojo::Base -base;
 
 use Mojo::IOLoop;
+use Mojo::Util 'deprecated';
 use Scalar::Util 'blessed';
 
 has ioloop => sub { Mojo::IOLoop->singleton }, weak => 1;
@@ -67,7 +68,9 @@ sub map {
 }
 
 sub new {
-  return shift->SUPER::new(@_) if @_ > 2 or ref($_[1]) eq 'HASH';
+  deprecated('->new with attributes is DEPRECATED in favor of ->new->ioloop(..)')
+    && return shift->SUPER::new(@_)
+    if @_ > 2 or ref($_[1]) eq 'HASH';
   my $self = shift->SUPER::new;
   shift->(sub { $self->resolve(@_) }, sub { $self->reject(@_) }) if @_;
   return $self;