c++ - Redefinition inconsistency in clang between struct and int -

the following program gives no error when compiling clang:

namespace x {     struct {}; }  namespace y {     using x::i;     struct {}; }  int main() {} 

let's use int instead of struct, get:

namespace x {     int i; }  namespace y {     using x::i;     int i; }  int main() {} 

this program gives redefinition error when compiling clang.

the difference between programs kind of entity used (struct or int), 1 compiles without errors , other gives redefinition error.

does indicate bug in clang? maybe standard ambiguous redefinition when comes using-declarations. shouldn't compiler make interpretation consistently?

the programs can compiled here:

• http://melpon.org/wandbox/permlink/cixqs9ejcxeyb53e
• http://melpon.org/wandbox/permlink/qmz8ehxyozvknzst

as igor tandetnik said, ill-formed due [basic.scope.declarative]/4 , there bug in clang.

the bug has been confirmed , fixed. see: https://llvm.org/bugs/show_bug.cgi?id=24033