A few functions in ranges.h need inlining

[palacaze]

Recent changes in ranges.h introduced non-templated functions that are not inlined, thus breaking the ODR and triggering compilation errors.

[vitaut]

Please provide more details and ideally a repro.

[palacaze]

Sure, I created a test then the corresponding fix here https://github.com/palacaze/fmt/tree/ranges-odr

[vitaut]

Could you submit a PR with the fix since you already have one?

[palacaze]

Would you prefer a PR with only the fix or also the accompanying testcase?

[vitaut]

Test would be great, thank you!