Can't reproduce https://stackoverflow.com/questions/47248920/msys2-bash-falls-when-substitution-with-pipe-inside-the-loop

msys2_shell_session.txt.

$ cat test.sh
#!/bin/sh

for a in 0; do
    echo b=$(echo "c-d" | tr - _)
done

$ . test.sh
b=c_d

$ sh test.sh
b=c_d

$ bash test.sh
b=c_d

$ ./test.sh
b=c_d