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diagnostics: translation infrastructure An implementation of the infrastructure required to have translatable diagnostic messages. - Introduces a `DiagnosticMessage` type which can represent both the current non-translatable messages and identifiers for [Fluent](https://projectfluent.org/). - Modifies current diagnostic API so that existing calls still work but `DiagnosticMessage`s can be provided too. - Adds support for always loading a "fallback bundle" containing the English diagnostic messages, which are used when a `DiagnosticMessage::FluentIdentifier` is used in a diagnostic being emitted. - Adds support for loading a "primary bundle" which contains the user's preferred language translation, and is used preferentially when it contains a diagnostic message being emitted. Primary bundles are loaded either from the path provided to `-Ztranslate-alternate-ftl` (for testing), or from the sysroot at `$sysroot/locale/$locale/*.ftl` given a locale with `-Ztranslate-lang` (which is parsed as a language identifier). - Adds "diagnostic args" which enable normally-interpolated variables to be made available as variables for Fluent messages to use. - Updates `#[derive(SessionDiagnostic)]` so that it can only be used for translatable diagnostics and update the handful of diagnostics which used the derive to be translatable. For example, the following diagnostic... ```rust #[derive(SessionDiagnostic)] #[error = "E0195"] pub struct LifetimesOrBoundsMismatchOnTrait { #[message = "lifetime parameters or bounds on {item_kind} `{ident}` do not match the trait declaration"] #[label = "lifetimes do not match {item_kind} in trait"] pub span: Span, #[label = "lifetimes in impl do not match this {item_kind} in trait"] pub generics_span: Option<Span>, pub item_kind: &'static str, pub ident: Ident, } ``` ...becomes... ```rust #[derive(SessionDiagnostic)] #[error(code = "E0195", slug = "typeck-lifetimes-or-bounds-mismatch-on-trait")] pub struct LifetimesOrBoundsMismatchOnTrait { #[primary_span] #[label] pub span: Span, #[label = "generics-label"] pub generics_span: Option<Span>, pub item_kind: &'static str, pub ident: Ident, } ``` ```fluent typeck-lifetimes-or-bounds-mismatch-on-trait = lifetime parameters or bounds on {$item_kind} `{$ident}` do not match the trait declaration .label = lifetimes do not match {$item_kind} in trait .generics-label = lifetimes in impl do not match this {$item_kind} in trait ``` r? `@estebank` cc `@oli-obk` `@Manishearth` |
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