test.cc:
#include <string>

template <class T>
class foo {
    public:
    std::basic_string<T> bar() {
        return "";
    }
};

foo<char> baz;
auto y = baz.bar();

Compiler command:
g++-5 -c -std=c++14 test.cc -o test.o

Result:
nm test.o |c++filt| grep bar
0000000000000000 W foo<char>::bar()

Expected:
nm test.o |c++filt| grep bar
0000000000000000 W foo<char>::bar[abi:cxx11]()