http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53132
Bug #: 53132 Summary: Missing top level in diagnostic's instantiation stack Classification: Unclassified Product: gcc Version: 4.7.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: jyass...@gcc.gnu.org gcc-4.7's diagnostic about a private copy constructor skips some levels in the template instantiation stack: $ cat test.cc #include <utility> class Uncopyable { // 2 public: Uncopyable() = default; private: Uncopyable(const Uncopyable&); // 6 }; class ContainsUncopyable { std::pair<Uncopyable, int> pv; // 9 }; void foo() { ContainsUncopyable c; // 12 } $ g++-4.7pre -c -std=c++11 test.cc .../include/c++/4.7.1/type_traits: In substitution of ‘template<class _From1, class _To1> static decltype ((__test_aux<_To1>(declval<_From1>()), std::__sfinae_types::__one())) std::__is_convertible_helper<_From, _To, false>::__test(int) [with _From1 = _From1; _To1 = _To1; _From = const Uncopyable&; _To = Uncopyable] [with _From1 = const Uncopyable&; _To1 = Uncopyable]’: .../include/c++/4.7.1/type_traits:1258:70: required from ‘constexpr const bool std::__is_convertible_helper<const Uncopyable&, Uncopyable, false>::value’ .../include/c++/4.7.1/type_traits:1263:12: required from ‘struct std::is_convertible<const Uncopyable&, Uncopyable>’ .../include/c++/4.7.1/type_traits:116:12: required from ‘struct std::__and_<std::is_convertible<const Uncopyable&, Uncopyable>, std::is_convertible<const int&, int> >’ .../include/c++/4.7.1/bits/stl_pair.h:113:38: required from here test.cc:6:3: error: ‘Uncopyable::Uncopyable(const Uncopyable&)’ is private In file included from .../include/c++/4.7.1/bits/move.h:57:0, from .../include/c++/4.7.1/bits/stl_pair.h:61, from .../include/c++/4.7.1/utility:72, from test.cc:1: .../include/c++/4.7.1/type_traits:1252:2: error: within this context # 3 more similar errors omitted This diagnostic is less readable than it should be because it omits the code I wrote at test.cc:9 or test.cc:12, which caused the template at stl_pair.h:113 to be instantiated. I've only seen this in C++11 mode because the std::pair enable_if is only present there. $ g++-4.7pre --version g++-4.7pre (GCC) 4.7.1 20120412 (prerelease)