[LLVMbugs] [Bug 21096] New: crashes during template type deduction

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21096

            Bug ID: 21096
           Summary: crashes during template type deduction
           Product: clang
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ryan.burn at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

crashes during template argument deduction. Attached original c++ file (uses
Facebook fatal library), as well as generate files. 

The code gives this error when compiling with g++:

main.cpp: In function 'int main()':
main.cpp:106:79: error: no matching function for call to
'slice(fatal::constant_sequence<int, 1, 2, 3, 4, 5>)'
main.cpp:106:79: note: candidate is:
main.cpp:84:3: note: template<int I, int J, class T, T ...Values> constexpr
decltype (to_constant_sequence(typename fatal::constant_sequence<T, Values
...>::list:: slice<I, J>)) slice(fatal::constant_sequence<T, Values ...>)
main.cpp:84:3: note:   template argument deduction/substitution failed:
main.cpp: In substitution of 'template<int I, int J, class T, T ...Values>
constexpr decltype (to_constant_sequence(typename fatal::constant_sequence<T,
Values ...>::list:: slice<I, J>)) slice(fatal::constant_sequence<T, Values
...>) [with int I = 1; int J = 3; T = int; T ...Values = {1, 2, 3, 4, 5}]':
main.cpp:106:79:   required from here
main.cpp:84:3: error: dependent-name 'typename fatal::constant_sequence<T,
Values ...>::list:: slice<I, J>' is parsed as a non-type, but instantiation
yields a type
main.cpp:84:3: note: say 'typename typename fatal::constant_sequence<T, Values
...>::list:: slice<I, J>' if a type is meant

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