cc1plus: error: candidates are: #‘tree_list’ not supported by dump_decl#

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int x;       namespace A {  int x; }       namespace B {  int x; }       int main()        {         using namespace A;         using namespace B;          x;  // error : ambiguity between A::i & B::i         return 0;        }

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prog.cpp: In function ‘int main()’:

prog.cpp:8: error: reference to ‘x’ is ambiguous

cc1plus: error: candidates are: #‘tree_list’ not supported by dump_decl#<declaration error>

prog.cpp:2: error:                 int A::x

prog.cpp:8: error: reference to ‘x’ is ambiguous

cc1plus: error: candidates are: #‘tree_list’ not supported by dump_decl#<declaration error>

prog.cpp:2: error:                 int A::x