/*
 *  linux/kernel/panic.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/*
 * This function is used through-out the kernel (includeinh mm and fs)
 * to indicate a major problem.
 */
#include <stdarg.h>

#include <linux/kernel.h>
#include <linux/sched.h>

asmlinkage void sys_sync(void);  /* it's really int */

extern int vsprintf(char * buf, const char * fmt, va_list args);

NORET_TYPE void panic(const char * fmt, ...)
{
  static char buf[1024];
  va_list args;

  va_start(args, fmt);
  vsprintf(buf, fmt, args);
  va_end(args);
  printk(KERN_EMERG "Kernel panic: %s\n",buf);
  if (current == task[0])
    printk(KERN_EMERG "In swapper task - not syncing\n");
  else
    sys_sync();
  for(;;);
}

ion is written in Rust(100%)
elvish is written in Go(100%)

root:~# ls|rg go
go #我们在 '.' 下有一个 "go" 目录
root:~# go
ion: cannot execute directory as command
#我的PATH下有go二进制文件, 但是ion发现"./go"存在并且是一个目录以后天真的认为我是把一个目录当成了命令
root:~# mkdir ls
root:~# ls
#这是一个笑话, 如果./ls/存在那么ls就不能被执行. 想使用ls列出`pwd`的内容就是不可能的
ion: cannot execute directory as command
root:~# touch rm
root:~# rm rm
#如果用文件替代目录, 就不会出现此问题
root:~# rm
rm: missing operand
Try 'rm --help' for more information.
root:~# mkdir rm
root:~# rm rm
ion: cannot execute directory as command