9956d4f99d
Non-subdiagnostic fields (i.e. those that don't have `#[label]` attributes or similar and are just additional context) have to be added as arguments for Fluent messages to refer them. This commit extends the `SessionDiagnostic` derive to do this for all fields that do not have attributes and introduces an `IntoDiagnosticArg` trait that is implemented on all types that can be converted to a argument for Fluent. Signed-off-by: David Wood <david.wood@huawei.com>
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