Panic with println on pipeline

[mengzhuo]

Bug Report

Environment

OS

Operating System: Linux

MoonBit CLI Tools Version

moon 0.1.20241111 (e6d64e0 2024-11-11) ~/.moon/bin/moon
moonc v0.1.20241111+dc2407357 ~/.moon/bin/moonc
moonrun 0.1.20241111 (e6d64e0 2024-11-11) ~/.moon/bin/moonrun

Steps to Reproduce

a simple program

fn main {
  for {
    println("y")
  }
}

Runs with
moon run main.mbt | head -n 1

Expected Behavior

print y for once

Actual Behavior

RUST_BACKTRACE=full bash tests/yes.sh
+ moon run src/yes
+ head -n 2
+ grep 'y\ny\n'
thread 'main' panicked at library/std/src/io/stdio.rs:1118:9:
failed printing to stdout: Broken pipe (os error 32)
stack backtrace:
   0:     0x5593e1c60004 - <unknown>
   1:     0x5593e1bb075b - <unknown>
   2:     0x5593e1c3a5fe - <unknown>
   3:     0x5593e1c612a7 - <unknown>
   4:     0x5593e1c61136 - <unknown>
   5:     0x5593e1c61ace - <unknown>
   6:     0x5593e1c614b2 - <unknown>
   7:     0x5593e1c61409 - <unknown>
   8:     0x5593e1c613f6 - <unknown>
   9:     0x5593e1b408a2 - <unknown>
  10:     0x5593e1c5fa82 - <unknown>
  11:     0x5593e1b4a320 - <unknown>
  12:     0x5593e23c7146 - <unknown>
fatal runtime error: failed to initiate panic, error 5
error: failed to run

Stack backtrace:
   0: <unknown>
   1: <unknown>
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: <unknown>
   6: <unknown>
   7: <unknown>
   8: <unknown>
   9: __libc_start_main
  10: <unknown>

Checklist

• (Optional) My case is minimal enough to be reproducible.