fluent 0.16.2 contains breaking changes

[cschramm]

fluent 0.16.2 changed its fluent-bundle dependency from 0.15.3 to 0.16. fluent-bundle 0.16.0 changed its fluent-syntax dependency from 0.11.1 to 0.12.

fluent has types from fluent-syntax (at least ast::Pattern and ast::Entry) in its public API, so that fluent 0.16.1 uses types from fluent-syntax 0.11 while fluent 0.16.2 uses types from fluent-syntax 0.12. This is a breaking change as they are technically different types.

The issue manifests at least in i18n-embed (0.15.4) as it uses fluent 0.16 with types from fluent-syntax 0.11. This works fine with 0.16.1 (and I suppose 0.16.0), but breaks with 0.16.2 which expects fluent-syntax 0.12 types.

Reproducer:

cargo init
cargo add i18n-embed -F fluent-system
cargo build
💥

[alerque]

Thanks for the detailed report. That public export is a mistake on several levels, and i18n-embed's use could probably be fixed to use the relevant lower level crate directly.

That being said I see the problem for downstream consumers. I've yanked fluent-0.16.2 for semver violations and will get a 0.17.0 release out as soon as I get a signoff.