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errors: implement fallback diagnostic translation

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This commit updates the signatures of all diagnostic functions to accept
types that can be converted into a `DiagnosticMessage`. This enables
existing diagnostic calls to continue to work as before and Fluent
identifiers to be provided. The `SessionDiagnostic` derive just
generates normal diagnostic calls, so these APIs had to be modified to
accept Fluent identifiers.

In addition, loading of the "fallback" Fluent bundle, which contains the
built-in English messages, has been implemented.

Each diagnostic now has "arguments" which correspond to variables in the
Fluent messages (necessary to render a Fluent message) but no API for
adding arguments has been added yet. Therefore, diagnostics (that do not
require interpolation) can be converted to use Fluent identifiers and
will be output as before.
This commit is contained in:
David Wood 2022-03-26 07:27:43 +00:00
parent c45f29595d
commit 7f91697b50
46 changed files with 919 additions and 293 deletions
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2
compiler/rustc_lint/src/builtin.rs
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@ -1571,7 +1571,7 @@ impl<'tcx> LateLintPass<'tcx> for TypeAliasBounds {
lint.build("bounds on generic parameters are not enforced in type aliases");
let msg = "the bound will not be checked when the type alias is used, \
and should be removed";
err.multipart_suggestion(&msg, suggestion, Applicability::MachineApplicable);
err.multipart_suggestion(msg, suggestion, Applicability::MachineApplicable);
if !suggested_changing_assoc_types {
TypeAliasBounds::suggest_changing_assoc_types(ty, &mut err);
suggested_changing_assoc_types = true;