piping the output of compilation sometimes results in broken pipe

[masukomi]

Not quite sure what's going on here. If i pipe to wc it works fine. head blows up though. Not sure how many other apps would blow up.

$ changelog_manager -c | head -n 2                                                                                    
## [Unreleased]
## [1.0.0] - 2016-07-28
Error writing file: Broken pipe (Errno)
[4320674721] *raise<Errno>:NoReturn +81
[4320679910] *IO::FileDescriptor#unbuffered_write<Slice(UInt8)>:Int32 +2438
[4320704519] *IO::FileDescriptor@IO::Buffered#write<Slice(UInt8)>:(Int32 | Nil) +167
[4320767165] *puts<String>:Nil +205
[4320868619] *ChangelogGenerator#process_changelog_files<Array(String)>:Array(String) +12363
[4320734295] main +18215