[LLVMbugs] [Bug 21080] New: Misleading error message: error: implicit instantiation of undefined template

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21080

            Bug ID: 21080
           Summary: Misleading error message: error: implicit
                    instantiation of undefined template
           Product: clang
           Version: trunk
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ilja.j.honkonen at nasa.gov
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Trying to compile a reduced version of the program at
https://github.com/nasailja/gensimcell/blob/a342ba0347de2f0d333641a39477de7c2abbe3cb/tests/parallel/one_variable.cpp
produces a very misleading message considering that the correct fix is to just
add #include "array" to the file:

../../source/gensimcell_impl.hpp:626:31: error: implicit instantiation of
undefined template 'std::__1::array<double, 3>'
        typename Variable::data_type data;
                                     ^
../../source/gensimcell.hpp:136:9: note: in instantiation of template class
      'gensimcell::detail::Cell_impl<Optional_Transfer, 1, test_variable2>'
requested here
        public detail::Cell_impl<Transfer_Policy, sizeof...(Variables),
Variables...>
               ^
one_variable.cpp:53:6: note: in instantiation of template class
'gensimcell::Cell<gensimcell::Optional_Transfer,
      test_variable2>' requested here
        a[0].set_transfer_all(true, v2);
            ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__tuple:69:65:
note: 
      template is declared here
template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
                                                                ^
1 error generated.


A correct looking array (std::...::array) is even mentioned in the error
message. It probably wouldn't be too difficult to give a hint to the user that
array is being used without including the required header...

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