Running dmu-upgrade with twig debug enabled will result in errors like these (8.x-1.3 with Drush 18.1.17 in Acquia Dev Desktop):
Indexing...done.
Error at line 3:1: unexpected < operator! [error]
Error at line 3:1: unexpected < operator! [error]This is because of the BEGIN OUTPUT and END OUTPUT HTML comments that are inserted around any twig template when using this mode.
Fixed
1.3
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
@Andybody: and that was with twig debugging enabled? In which files?
@Gábor Hojtsy sorry I don't remember anymore. It's 3 month ago :(
If I should run into this again, I'll provide further information. Should have been more detailed here, sorry.
I retitled and reopened 🐛 Detect and fail if Twig debugging is enabled Needs review .