id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc 2037,concept_check fails with types declared in unnamed namespace,Stephan,jsiek,"after upgrading to gcc 4.2.3 the following snippet fails to compile {{{ #include struct MyVisitor{}; namespace test{ struct MyVisitor{};} namespace{ struct MyVisitorAnon{};} int main(){ using namespace boost; function_requires >(); function_requires >(); function_requires >(); //this linebreaks the build return 0; } }}} The error message is attached. Is this a problem of gcc or concept_check? ",Bugs,closed,To Be Determined,concept_check,Boost 1.40.0,Problem,worksforme,,stephan.diederich@…