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diff --git a/t/900_mouse_bugs/001_immutable_types.t b/t/900_mouse_bugs/001_immutable_types.t
new file mode 100644
index 0000000..b3950e2
--- /dev/null
+++ b/t/900_mouse_bugs/001_immutable_types.t
@@ -0,0 +1,67 @@
+use strict;
+use warnings;
+use Test::More tests => 4;
+use Mouse::Util::TypeConstraints;
+
+subtype 'Foo', as 'Object', where { $_->isa('A') };
+
+{
+    package A;
+    use Mouse;
+    has data => ( is => 'rw', isa => 'Str' );
+}
+
+{
+    package C;
+    use Mouse;
+    has a => ( is => 'rw', isa => 'Foo', coerce => 1 );
+}
+
+isa_ok(C->new(a => A->new()), 'C');
+C->meta->make_immutable;
+isa_ok(C->new(a => A->new()), 'C');
+
+
+
+# The BUILD invocation order used to get reversed after
+# making a class immutable.  This checks it is correct.
+{
+    package D;
+    use Mouse;
+
+    # we'll keep
+    has order => 
+        (is => 'ro', 
+         default => sub {[]});
+
+    sub BUILD { push @{shift->order}, 'D' }
+
+    package E;
+    use Mouse;
+    extends 'D';
+
+    sub BUILD { push @{shift->order}, 'E' }
+
+    package F;
+    use Mouse;
+    extends 'E';
+
+    sub BUILD { push @{shift->order}, 'F' }
+
+
+}
+
+my $obj = F->new;
+
+print join(", ", @{$obj->order}),"\n";
+is_deeply $obj->order, [qw(D E F)], "mutable BUILD invocation order correct";
+
+# now make the classes immutable
+$_->meta->make_immutable for qw(D E F);
+
+my $obj2 = F->new;
+
+print join(", ", @{$obj2->order}),"\n";
+is_deeply $obj2->order, [qw(D E F)], "immutable BUILD invocation order still correct";
+
+