https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80296
Bug ID: 80296
Summary: Broken diagnostic 'unary_plus_expr' not supported by
expression
Product: gcc
Version: 7.0.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: reichelt at gcc dot gnu.org
Target Milestone: ---
GCC gives a broken daignostic for the following invalid code snippet
since GCC 4.7.0:
=============================================
template <int...> struct A {};
template <int... N> using B = A<+N...>;
B<int> b;
=============================================
bug.cc:5:6: error: type/value mismatch at argument 1 in template parameter list
for 'template<int ...N> using B = A<#'unary_plus_expr' not supported by
expression#...>'
B<int> b;
^
bug.cc:5:6: note: expected a constant of type 'int', got 'int'
