Fedor Chelnokov

### Describe the bug ``` #include ``` results in `fatal error: 'iostream' file not found` ### Steps to reproduce https://gcc.godbolt.org/z/4edq7aoKx ### Expected behavior Standard headers must be available by default...

`to_string( stacktrace )` gets stuck if first called during DLL loading

2

# Describe the bug If `to_string( std::stacktrace::current() )` first called during DLL loading, then the application can hang forever. # Test case Put a global variable in your DLL calling...

Wrong processing of overloaded set within requires-expression

4

This program ``` void f(); void f(int); template concept C = sizeof(T) == 42; // accepted by Clang, but why? static_assert( requires {{ &f } -> C;} ); ``` looks...

# Describe the bug If one calls `to_string( std::stacktrace::current() );` initially from a dynamic library (DLL), then this library fails to unload properly. In particular, global objects it in are...