Unhandled gulp-postcss errors don't end up in console if not manually catched

gistfile1.js

var Stream = require('stream')
var gulp = require('gulp')
var postcss = require('gulp-postcss')

function errorStream () {
  var stream = new Stream.Transform({ objectMode: true })
  stream._transform = function (file, encoding, cb) {
    cb(new Error('unhandled exception!'))
  }
  return stream
}

gulp.task('stream', function () {
  gulp.src('package.json')
      .pipe(errorStream())
      .pipe(gulp.dest('dest'))
})

/*

[11:42:46] Using gulpfile ~/Work/stream-test/gulpfile.js
[11:42:46] Starting 'stream'...
[11:42:46] Finished 'stream' after 5.25 ms

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: unhandled exception
    at Transform.stream._transform (/Users/w0rm/Work/stream-test/gulpfile.js:8:8)
    at Transform._read (_stream_transform.js:179:10)
    at Transform._write (_stream_transform.js:167:12)
    at doWrite (_stream_writable.js:226:10)
    at writeOrBuffer (_stream_writable.js:216:5)
    at Transform.Writable.write (_stream_writable.js:183:11)
    at write (/Users/w0rm/Work/stream-test/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:623:24)
    at flow (/Users/w0rm/Work/stream-test/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:632:7)
    at DestroyableTransform.pipeOnReadable (/Users/w0rm/Work/stream-test/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:664:5)
    at DestroyableTransform.emit (events.js:92:17)

*/


gulp.task('postcss', function () {
  gulp.src('package.json')
      .pipe(postcss([function () {}]))
      // Error will only be shown if this line is uncommented
      //.on('error', console.log)
      .pipe(gulp.dest('dest'))
})

/*

[11:44:16] Using gulpfile ~/Work/stream-test/gulpfile.js
[11:44:16] Starting 'postcss'...
[11:44:16] Finished 'postcss' after 5.36 ms

*/