#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */
typedef int /*<<< orphan*/ sem_t;
typedef scalar_t__ pid_t;
typedef scalar_t__ key_t;

/* Variables and functions */
scalar_t__ ECHILD;
int IPC_CREAT;
int /*<<< orphan*/ IPC_RMID;
int O_CREAT;
int O_EXCL;
scalar_t__ errno;
int /*<<< orphan*/ exit(int);
scalar_t__ fork();
scalar_t__ ftok(char *, int);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ sem_close(int /*<<< orphan*/ *);
int /*<<< orphan*/ *sem_open(char *, int, int, unsigned int);
int /*<<< orphan*/ sem_post(int /*<<< orphan*/ *);
int /*<<< orphan*/ sem_unlink(char *);
int /*<<< orphan*/ sem_wait(int /*<<< orphan*/ *);
scalar_t__ shmat(int, int /*<<< orphan*/ *, int /*<<< orphan*/);
int /*<<< orphan*/ shmctl(int, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ shmdt(int *);
int shmget(scalar_t__, int, int);
scalar_t__ waitpid(int, int /*<<< orphan*/ *, int /*<<< orphan*/);
int main() {
  key_t sharedMemKey;
  int sharedMemID;
  sem_t *lock;
  pid_t pid;
  int *testVar;
  int forkCounter;
  unsigned int SemValue;
  sharedMemKey = ftok("/dev/null", 42);
  if (sharedMemKey < 0) {
    perror("ftok did nto work properly\n");
    exit(1);
  }
  printf("Share Memory key for testVar:  %d\n", sharedMemKey);
  sharedMemID = shmget(sharedMemKey, sizeof(int), 0666 | IPC_CREAT);
  if (sharedMemID < 0) {
    perror("shmget did not work properly\n");
    exit(1);
  }
  testVar = (int *)shmat(sharedMemID, NULL, 0);
  *testVar = 1;
  SemValue = 1;
  lock = sem_open("SharedSem", O_CREAT | O_EXCL, 0666, SemValue);
  int i;
  for (i = 0; i < 16; i++) {
    pid = fork();
    forkCounter = i;
    if (pid < 0) {
      sem_unlink("SharedSem");
      sem_close(lock);
      printf("Did not get a pid correctly\n");
    } else if (pid == 0)
      break;
  }
  if (pid != 0) {
    while ((pid = waitpid(-1, NULL, 0)))
      if (errno == ECHILD)
        break;
    printf("Children are done\n");
    shmdt(testVar);
    shmctl(sharedMemID, IPC_RMID, 0);
    sem_unlink("SharedSem");
    sem_close(lock);
    exit(0);
  } else {
    sem_wait(lock);
    printf("Child(%d): Inside the lock\n", forkCounter);
    *testVar = *testVar + forkCounter;
    printf("Child(%d): New Value of testVar = %d\n", forkCounter, *testVar);
    printf("Child(%d): Releasing lock\n\n", forkCounter);
    sem_post(lock);
    exit(0);
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xdfa(%rip),%rdi
mov    $0x2a,%esi
call   10f0 <ftok@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jge    1235 <main+0x45>
lea    0xde4(%rip),%rdi
call   10b0 <perror@plt>
mov    $0x1,%edi
call   10e0 <exit@plt>
mov    -0x10(%rbp),%rsi
lea    0xde6(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
mov    -0x10(%rbp),%rdi
mov    0x2d66(%rip),%rax
mov    (%rax),%edx
or     $0x1b6,%edx
mov    $0x4,%esi
call   10d0 <shmget@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    1287 <main+0x97>
lea    0xdd1(%rip),%rdi
call   10b0 <perror@plt>
mov    $0x1,%edi
call   10e0 <exit@plt>
mov    -0x14(%rbp),%edi
xor    %eax,%eax
mov    %eax,%esi
xor    %edx,%edx
call   10c0 <shmat@plt>
mov    %rax,-0x30(%rbp)
mov    -0x30(%rbp),%rax
movl   $0x1,(%rax)
movl   $0x1,-0x38(%rbp)
mov    0x2d47(%rip),%rax
mov    (%rax),%esi
mov    0x2d1e(%rip),%rax
or     (%rax),%esi
mov    -0x38(%rbp),%ecx
lea    0xda1(%rip),%rdi
mov    $0x1b6,%edx
call   1070 <sem_open@plt>
mov    %rax,-0x20(%rbp)
movl   $0x0,-0x3c(%rbp)
cmpl   $0x10,-0x3c(%rbp)
jge    1351 <main+0x161>
mov    $0x0,%al
call   1110 <fork@plt>
mov    %rax,-0x28(%rbp)
mov    -0x3c(%rbp),%eax
mov    %eax,-0x34(%rbp)
cmpq   $0x0,-0x28(%rbp)
jge    1329 <main+0x139>
lea    0xd5f(%rip),%rdi
call   1100 <sem_unlink@plt>
mov    -0x20(%rbp),%rdi
call   10a0 <sem_close@plt>
lea    0xd54(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
jmp    133e <main+0x14e>
cmpq   $0x0,-0x28(%rbp)
jne    1339 <main+0x149>
jmp    1351 <main+0x161>
jmp    133e <main+0x14e>
jmp    1343 <main+0x153>
mov    -0x3c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x3c(%rbp)
jmp    12db <main+0xeb>
cmpq   $0x0,-0x28(%rbp)
je     13e9 <main+0x1f9>
jmp    1361 <main+0x171>
mov    $0xffffffff,%edi
xor    %eax,%eax
mov    %eax,%esi
xor    %edx,%edx
call   1080 <waitpid@plt>
mov    %rax,-0x28(%rbp)
cmp    $0x0,%rax
je     13a3 <main+0x1b3>
mov    0x2c4a(%rip),%rax
mov    (%rax),%rax
mov    0x2c30(%rip),%rcx
cmp    (%rcx),%rax
jne    139e <main+0x1ae>
jmp    13a3 <main+0x1b3>
jmp    1361 <main+0x171>
lea    0xce4(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
mov    -0x30(%rbp),%rdi
call   1040 <shmdt@plt>
mov    -0x14(%rbp),%edi
mov    0x2c04(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1090 <shmctl@plt>
lea    0xc93(%rip),%rdi
call   1100 <sem_unlink@plt>
mov    -0x20(%rbp),%rdi
call   10a0 <sem_close@plt>
xor    %edi,%edi
call   10e0 <exit@plt>
mov    -0x20(%rbp),%rdi
call   1030 <sem_wait@plt>
mov    -0x34(%rbp),%esi
lea    0xca5(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
mov    -0x30(%rbp),%rax
mov    (%rax),%ecx
add    -0x34(%rbp),%ecx
mov    -0x30(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x34(%rbp),%esi
mov    -0x30(%rbp),%rax
mov    (%rax),%edx
lea    0xc9b(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
mov    -0x34(%rbp),%esi
lea    0xcb0(%rip),%rdi
mov    $0x0,%al
call   1050 <printf@plt>
mov    -0x20(%rbp),%rdi
call   1060 <sem_post@plt>
xor    %edi,%edi
call   10e0 <exit@plt>

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
lea    0xdee(%rip),%rdi
mov    $0x2a,%esi
call   1100 <ftok@plt>
test   %rax,%rax
jns    122a <main+0x2a>
lea    0xde2(%rip),%rdi
jmp    1264 <main+0x64>
mov    %rax,%rbx
lea    0xdf2(%rip),%rdi
mov    %rax,%rsi
xor    %eax,%eax
call   1060 <printf@plt>
mov    0x2d73(%rip),%rax
mov    $0x1b6,%edx
or     (%rax),%edx
mov    %rbx,%rdi
mov    $0x4,%esi
call   10e0 <shmget@plt>
test   %eax,%eax
jns    1273 <main+0x73>
lea    0xde5(%rip),%rdi
call   10c0 <perror@plt>
mov    $0x1,%edi
call   10f0 <exit@plt>
mov    %eax,%r15d
mov    %eax,%edi
xor    %esi,%esi
xor    %edx,%edx
call   10d0 <shmat@plt>
mov    %rax,%r14
movl   $0x1,(%rax)
mov    0x2d67(%rip),%rax
mov    0x2d40(%rip),%rcx
mov    (%rcx),%esi
or     (%rax),%esi
lea    0xdc4(%rip),%r13
mov    %r13,%rdi
mov    $0x1b6,%edx
mov    $0x1,%ecx
call   1080 <sem_open@plt>
mov    %rax,%r12
lea    0xe22(%rip),%rbp
xor    %ebx,%ebx
jmp    12f0 <main+0xf0>
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
mov    %r13,%rdi
call   1110 <sem_unlink@plt>
mov    %r12,%rdi
call   10b0 <sem_close@plt>
mov    %rbp,%rdi
call   1040 <puts@plt>
add    $0xffffffff,%ebx
cmp    $0xfffffff0,%ebx
je     1351 <main+0x151>
xor    %eax,%eax
call   1120 <fork@plt>
test   %rax,%rax
js     12d0 <main+0xd0>
jne    12e8 <main+0xe8>
mov    %r12,%rdi
call   1030 <sem_wait@plt>
mov    %ebx,%ebp
neg    %ebp
lea    0xd60(%rip),%rdi
mov    %ebp,%esi
xor    %eax,%eax
call   1060 <printf@plt>
mov    (%r14),%edx
sub    %ebx,%edx
mov    %edx,(%r14)
lea    0xd64(%rip),%rdi
mov    %ebp,%esi
xor    %eax,%eax
call   1060 <printf@plt>
lea    0xd7a(%rip),%rdi
mov    %ebp,%esi
xor    %eax,%eax
call   1060 <printf@plt>
mov    %r12,%rdi
call   1070 <sem_post@plt>
xor    %edi,%edi
call   10f0 <exit@plt>
mov    0x2c78(%rip),%rbx
mov    0x2c61(%rip),%rbp
nop
mov    $0xffffffff,%edi
xor    %esi,%esi
xor    %edx,%edx
call   1090 <waitpid@plt>
test   %rax,%rax
je     137c <main+0x17c>
mov    (%rbx),%rax
cmp    0x0(%rbp),%rax
jne    1360 <main+0x160>
lea    0xd4c(%rip),%rdi
call   1040 <puts@plt>
mov    %r14,%rdi
call   1050 <shmdt@plt>
mov    0x2c31(%rip),%rax
mov    (%rax),%esi
mov    %r15d,%edi
xor    %edx,%edx
call   10a0 <shmctl@plt>
lea    0xcbd(%rip),%rdi
call   1110 <sem_unlink@plt>
mov    %r12,%rdi
call   10b0 <sem_close@plt>
xor    %edi,%edi
call   10f0 <exit@plt>

LLVM IR (-O0):
@.str = [10 x i8] c"/dev/null\00"
@.str.1 = [28 x i8] c"ftok did nto work properly\0A\00"
@.str.2 = [35 x i8] c"Share Memory key for testVar: %d\0A\00"
@IPC_CREAT = global i32 0
@.str.3 = [30 x i8] c"shmget did not work properly\0A\00"
@.str.4 = [10 x i8] c"SharedSem\00"
@O_CREAT = global i32 0
@O_EXCL = global i32 0
@.str.5 = [29 x i8] c"Did not get a pid correctly\0A\00"
@errno = global i64 0
@ECHILD = global i64 0
@.str.6 = [19 x i8] c"Children are done\0A\00"
@IPC_RMID = global i32 0
@.str.7 = [28 x i8] c"Child(%d): Inside the lock\0A\00"
@.str.8 = [38 x i8] c"Child(%d): New Value of testVar = %d\0A\00"
@.str.9 = [28 x i8] c"Child(%d): Releasing lock\0A\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i64
%3 = alloca i32
%4 = alloca i32*
%5 = alloca i64
%6 = alloca i32*
%7 = alloca i32
%8 = alloca i32
%9 = alloca i32
store i32 0, i32* %1
%10 = call i64 @ftok(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 42)
store i64 %10, i64* %2
%11 = load i64, i64* %2
%12 = icmp slt i64 %11, 0
br i1 %12, label %13, label %16
13: ; preds = %0
%14 = call i32 @perror(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0))
%15 = call i32 @exit(i32 1)
unreachable
16: ; preds = %0
%17 = load i64, i64* %2
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.2, i64 0, i64 0), i64 %17)
%19 = load i64, i64* %2
%20 = load i32, i32* @IPC_CREAT
%21 = or i32 438, %20
%22 = call i32 @shmget(i64 %19, i32 4, i32 %21)
store i32 %22, i32* %3
%23 = load i32, i32* %3
%24 = icmp slt i32 %23, 0
br i1 %24, label %25, label %28
25: ; preds = %16
%26 = call i32 @perror(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.3, i64 0, i64 0))
%27 = call i32 @exit(i32 1)
unreachable
28: ; preds = %16
%29 = load i32, i32* %3
%30 = call i64 @shmat(i32 %29, i32* null, i32 0)
%31 = inttoptr i64 %30 to i32*
store i32* %31, i32** %6
%32 = load i32*, i32** %6
store i32 1, i32* %32
store i32 1, i32* %8
%33 = load i32, i32* @O_CREAT
%34 = load i32, i32* @O_EXCL
%35 = or i32 %33, %34
%36 = load i32, i32* %8
%37 = call i32* @sem_open(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0), i32 %35, i32 438, i32 %36)
store i32* %37, i32** %4
store i32 0, i32* %9
br label %38
38: ; preds = %57, %28
%39 = load i32, i32* %9
%40 = icmp slt i32 %39, 16
br i1 %40, label %41, label %60
41: ; preds = %38
%42 = call i64 (...) @fork()
store i64 %42, i64* %5
%43 = load i32, i32* %9
store i32 %43, i32* %7
%44 = load i64, i64* %5
%45 = icmp slt i64 %44, 0
br i1 %45, label %46, label %51
46: ; preds = %41
%47 = call i32 @sem_unlink(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0))
%48 = load i32*, i32** %4
%49 = call i32 @sem_close(i32* %48)
%50 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.5, i64 0, i64 0))
br label %56
51: ; preds = %41
%52 = load i64, i64* %5
%53 = icmp eq i64 %52, 0
br i1 %53, label %54, label %55
54: ; preds = %51
br label %60
55: ; preds = %51
br label %56
56: ; preds = %55, %46
br label %57
57: ; preds = %56
%58 = load i32, i32* %9
%59 = add nsw i32 %58, 1
store i32 %59, i32* %9
br label %38
60: ; preds = %54, %38
%61 = load i64, i64* %5
%62 = icmp ne i64 %61, 0
br i1 %62, label %63, label %84
63: ; preds = %60
br label %64
64: ; preds = %72, %63
%65 = call i64 @waitpid(i32 -1, i32* null, i32 0)
store i64 %65, i64* %5
%66 = icmp ne i64 %65, 0
br i1 %66, label %67, label %73
67: ; preds = %64
%68 = load i64, i64* @errno
%69 = load i64, i64* @ECHILD
%70 = icmp eq i64 %68, %69
br i1 %70, label %71, label %72
71: ; preds = %67
br label %73
72: ; preds = %67
br label %64
73: ; preds = %71, %64
%74 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.6, i64 0, i64 0))
%75 = load i32*, i32** %6
%76 = call i32 @shmdt(i32* %75)
%77 = load i32, i32* %3
%78 = load i32, i32* @IPC_RMID
%79 = call i32 @shmctl(i32 %77, i32 %78, i32 0)
%80 = call i32 @sem_unlink(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0))
%81 = load i32*, i32** %4
%82 = call i32 @sem_close(i32* %81)
%83 = call i32 @exit(i32 0)
unreachable
84: ; preds = %60
%85 = load i32*, i32** %4
%86 = call i32 @sem_wait(i32* %85)
%87 = load i32, i32* %7
%88 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.7, i64 0, i64 0), i32 %87)
%89 = load i32*, i32** %6
%90 = load i32, i32* %89
%91 = load i32, i32* %7
%92 = add nsw i32 %90, %91
%93 = load i32*, i32** %6
store i32 %92, i32* %93
%94 = load i32, i32* %7
%95 = load i32*, i32** %6
%96 = load i32, i32* %95
%97 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str.8, i64 0, i64 0), i32 %94, i32 %96)
%98 = load i32, i32* %7
%99 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.9, i64 0, i64 0), i32 %98)
%100 = load i32*, i32** %4
%101 = call i32 @sem_post(i32* %100)
%102 = call i32 @exit(i32 0)
unreachable
}

LLVM IR (-O2):
@.str = [10 x i8] c"/dev/null\00"
@.str.1 = [28 x i8] c"ftok did nto work properly\0A\00"
@.str.2 = [35 x i8] c"Share Memory key for testVar: %d\0A\00"
@IPC_CREAT = global i32 0
@.str.3 = [30 x i8] c"shmget did not work properly\0A\00"
@.str.4 = [10 x i8] c"SharedSem\00"
@O_CREAT = global i32 0
@O_EXCL = global i32 0
@errno = global i64 0
@ECHILD = global i64 0
@IPC_RMID = global i32 0
@.str.7 = [28 x i8] c"Child(%d): Inside the lock\0A\00"
@.str.8 = [38 x i8] c"Child(%d): New Value of testVar = %d\0A\00"
@.str.9 = [28 x i8] c"Child(%d): Releasing lock\0A\0A\00"
@str = [18 x i8] c"Children are done\00"
@str.10 = [28 x i8] c"Did not get a pid correctly\00"
define i32 @main() {
%1 = tail call i64 @ftok(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i32 42)
%2 = icmp slt i64 %1, 0
br i1 %2, label %3, label %6
3: ; preds = %0
%4 = tail call i32 @perror(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0))
%5 = tail call i32 @exit(i32 1)
unreachable
6: ; preds = %0
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([35 x i8], [35 x i8]* @.str.2, i64 0, i64 0), i64 %1)
%8 = load i32, i32* @IPC_CREAT
%9 = or i32 %8, 438
%10 = tail call i32 @shmget(i64 %1, i32 4, i32 %9)
%11 = icmp slt i32 %10, 0
br i1 %11, label %12, label %15
12: ; preds = %6
%13 = tail call i32 @perror(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.3, i64 0, i64 0))
%14 = tail call i32 @exit(i32 1)
unreachable
15: ; preds = %6
%16 = tail call i64 @shmat(i32 %10, i32* null, i32 0)
%17 = inttoptr i64 %16 to i32*
store i32 1, i32* %17
%18 = load i32, i32* @O_CREAT
%19 = load i32, i32* @O_EXCL
%20 = or i32 %19, %18
%21 = tail call i32* @sem_open(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0), i32 %20, i32 438, i32 1)
br label %22
22: ; preds = %15, %32
%23 = phi i32 [ 0, %15 ], [ %33, %32 ]
%24 = tail call i64 (...) @fork()
%25 = icmp slt i64 %24, 0
br i1 %25, label %26, label %30
26: ; preds = %22
%27 = tail call i32 @sem_unlink(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0))
%28 = tail call i32 @sem_close(i32* %21)
%29 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @str.10, i64 0, i64 0))
br label %32
30: ; preds = %22
%31 = icmp eq i64 %24, 0
br i1 %31, label %50, label %32
32: ; preds = %26, %30
%33 = add nuw nsw i32 %23, 1
%34 = icmp eq i32 %33, 16
br i1 %34, label %35, label %22
35: ; preds = %32, %38
%36 = tail call i64 @waitpid(i32 -1, i32* null, i32 0)
%37 = icmp eq i64 %36, 0
br i1 %37, label %42, label %38
38: ; preds = %35
%39 = load i64, i64* @errno
%40 = load i64, i64* @ECHILD
%41 = icmp eq i64 %39, %40
br i1 %41, label %42, label %35
42: ; preds = %38, %35
%43 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @str, i64 0, i64 0))
%44 = tail call i32 @shmdt(i32* %17)
%45 = load i32, i32* @IPC_RMID
%46 = tail call i32 @shmctl(i32 %10, i32 %45, i32 0)
%47 = tail call i32 @sem_unlink(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.4, i64 0, i64 0))
%48 = tail call i32 @sem_close(i32* %21)
%49 = tail call i32 @exit(i32 0)
unreachable
50: ; preds = %30
%51 = tail call i32 @sem_wait(i32* %21)
%52 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.7, i64 0, i64 0), i32 %23)
%53 = load i32, i32* %17
%54 = add nsw i32 %53, %23
store i32 %54, i32* %17
%55 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([38 x i8], [38 x i8]* @.str.8, i64 0, i64 0), i32 %23, i32 %54)
%56 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.9, i64 0, i64 0), i32 %23)
%57 = tail call i32 @sem_post(i32* %21)
%58 = tail call i32 @exit(i32 0)
unreachable
}