Fixes for ci.

Clang 3.6 requires the extra constructors in the custom_deleter.

Author: iwanders

include/pybind11/detail/smart_holder_type_casters.h

@@ -637,8 +637,8 @@ struct smart_holder_type_caster_load {
                 extracted_deleter = std::move(custom_deleter_ptr->deleter);
             } else {
                 // Not sure if anything needs to be done here. In general, if the del function is
-                // used a default destructor is used which should be accomodated by the type of the
-                // deleter used in the returned unique ptr.
+                // used a default destructor is used which should be accommodated by the type of
+                // the deleter used in the returned unique ptr.
             }
         }
 

tests/test_class_sh_basic.cpp

@@ -68,6 +68,8 @@ std::string pass_udcp(std::unique_ptr<atyp const, sddc> obj) { return "pass_udcp
 struct custom_deleter
 {
     std::string delete_txt;
+    custom_deleter() {}
+    explicit custom_deleter(const std::string &delete_txt_) : delete_txt(delete_txt_) {}
     void operator()(atyp* p) const
     {
         std::default_delete<atyp>()(p);
@@ -80,7 +82,7 @@ struct custom_deleter
 
 std::unique_ptr<atyp,       custom_deleter> rtrn_udmp_del() { return std::unique_ptr<atyp,       custom_deleter>(new atyp{"rtrn_udmp_del"}, custom_deleter{"udmp_deleter"}); }
 std::unique_ptr<atyp const, custom_deleter> rtrn_udcp_del() { return std::unique_ptr<atyp const, custom_deleter>(new atyp{"rtrn_udcp_del"}, custom_deleter{"udcp_deleter"}); }
- 
+
 std::string pass_udmp_del(std::unique_ptr<atyp,       custom_deleter> obj) { return "pass_udmp_del:" + obj->mtxt + "," + obj.get_deleter().delete_txt; }
 std::string pass_udcp_del(std::unique_ptr<atyp const, custom_deleter> obj) { return "pass_udcp_del:" + obj->mtxt + "," + obj.get_deleter().delete_txt; }
 

tests/test_class_sh_basic.py

@@ -64,6 +64,7 @@ def test_load_with_mtxt(pass_f, mtxt, expected):
 def test_load_with_rtrn_f(pass_f, rtrn_f, expected):
     assert pass_f(rtrn_f()) == expected
 
+
 @pytest.mark.parametrize(
     ("pass_f", "rtrn_f", "expected"),
     [
@@ -74,6 +75,7 @@ def test_load_with_rtrn_f(pass_f, rtrn_f, expected):
 def test_deleter_roundtrip(pass_f, rtrn_f, expected):
     assert pass_f(rtrn_f()) == expected
 
+
 @pytest.mark.parametrize(
     ("pass_f", "rtrn_f", "expected"),
     [