Hi @sethtroisi , the tags are used for tracking this test in our code. The missing END tags means we wouldn't know the region, but we don't strictly need that information. Typically, these define regions of code to be used as samples but the spanner_test_* labels are just used to track existence.

Wow this is crazy, that appears to be the only unmatched tag

grep -hri '^\s*# \[\(END\|START\)' | sed -e 's/\s*# \[//' -e 's/]$//' | awk '{print $2, $1}' | LC_COLLATE=C sort | uniq -c | paste -d" " - - | awk '{print $1, $4, $6, $3, $2, $5}' | awk '$1 != $2 {print $0}'