default = ["std_detect_file_io", "std_detect_dlsym_getauxval", "panic-unwind"]
backtrace = ["std/backtrace"]
compiler-builtins-c = ["std/compiler-builtins-c"]
+compiler-builtins-mem = ["std/compiler-builtins-mem"]
llvm-libunwind = ["std/llvm-libunwind"]
panic-unwind = ["std/panic_unwind"]
panic_immediate_abort = ["std/panic_immediate_abort"]