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Date: Sun, 29 Nov 2009 15:31:00 -0000
Subject: [Bug c++/42218]  New: [4.5 Regression] Broken diagnostic: 'tree_vec' not supported by pp_c_expression
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A broken diagnostic is issued for the following invalid code snippet on trunk:

================================
template<int> struct A
{
  template<int> struct B;
};

int i = A<0>::B<0>::X::Y;
================================

bug.cc:6:21: error: 'A<0>::B<#'tree_vec' not supported by pp_c_expression#,
#'tree_vec' not supported by pp_c_expression#>::X' has not been declared

GCC 4.3.x and 4.4.x issue a sensible error message:

bug.cc:6: error: 'A::B::X' has not been declared

GCC 4.2.x issues an even better error message:

bug.cc:6: error: 'struct A<0>::B<0>::X' has not been declared


-- 
           Summary: [4.5 Regression] Broken diagnostic: 'tree_vec' not
                    supported by pp_c_expression
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: diagnostic, monitored
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42218