https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67795
Bug ID: 67795 Summary: Wrong code generated for conditional expression with cast Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: frankhb1989 at gmail dot com Target Milestone: --- Case: // g++ -std=c++1y #include <iostream> #include <string> #include <experimental/string_view> using namespace std; using namespace experimental; string_view& erase_left(size_t n, string_view& s) { return static_cast<string_view&>(n != 0 ? (s.remove_prefix(n), s) : s); // return n != 0 ? (s.remove_prefix(n), s) : s; } int main() { string_view sv("abcde"); cout << erase_left(3, sv).to_string() << endl; // expected "de" } The output is garbage, using i686-w64-mingw32-g++ from MSYS2. However, x86_64-w64-mingw32-clang++ is OK. So I suspect it is a frontend bug.