Hi, Commit 60273407f92fdfe36c3ec09decfd92746bbb4f5e augments ‘-Wformat’ to warn about format specifies not supported by ‘simple-format’, the default ‘format’ core binding.
The nasty thing is that (ice-9 format) set!s the core ‘format’, so often, but not always, things work as though you had imported (ice-9 format). Comments welcome! Ludo’.