Not sure why the build shows as errored (besides that I didn't add a test because I don't remember how to re-generate the .txt fixtures). The different steps completed successfully.

Build looks ok, merging.

To recreate the .txt files, you can run ./auto_update_tests.py

Currently trying to regenerate the tests. On Windows, this results in .wast files using 0xD 0xD 0xA line endings (literally double 0xD), and it eventually terminates with

[parse exception: inline string contains NULL (0). that is technically valid in wasm, but you shouldn't do it, and it's not supported in binaryen]Fatal: error in parsing input
Traceback (most recent call last):
  File "auto_update_tests.py", line 103, in <module>
    actual += run_command(cmd)
  File "...\binaryen\scripts\test\support.py", line 161, in run_command
    raise Exception(('run_command failed (%s)' % code, out + str(err or '')))
Exception: ('run_command failed (1)', '')

which is thrown in wasm-binary.cpp:1399 after evaluating the characters (then followed by \0)

f
a
c
-
o
p
t
�
ù
Ç
Ç
Ç

Not sure if that helps in any way, but I wasn't able to figure this out yet.

Very odd. The auto update script is pretty simple, just runs the commands and saves the output, so not sure how something could go wrong.