telepathy-glib used to make critical warnings fatal for CMs (Bug #14603). Versions >= 0.9.3 will not do this, so if we want the code-quality benefits of treating these warnings as fatal, we should enable that specifically in each CM where it's relevant. (WONTFIX is an acceptable resolution for this bug if that's the maintainers' considered opinion.)
Fixed in git for 0.3.12
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