rustc_typeck to rustc_hir_analysis

compiler/rustc_hir_analysis/src/structured_errors.rs

@@ -0,0 +1,42 @@
+mod missing_cast_for_variadic_arg;
+mod sized_unsized_cast;
+mod wrong_number_of_generic_args;
+
+pub use self::{
+    missing_cast_for_variadic_arg::*, sized_unsized_cast::*, wrong_number_of_generic_args::*,
+};
+
+use rustc_errors::{DiagnosticBuilder, DiagnosticId, ErrorGuaranteed};
+use rustc_session::Session;
+
+pub trait StructuredDiagnostic<'tcx> {
+    fn session(&self) -> &Session;
+
+    fn code(&self) -> DiagnosticId;
+
+    fn diagnostic(&self) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
+        let err = self.diagnostic_common();
+
+        if self.session().teach(&self.code()) {
+            self.diagnostic_extended(err)
+        } else {
+            self.diagnostic_regular(err)
+        }
+    }
+
+    fn diagnostic_common(&self) -> DiagnosticBuilder<'tcx, ErrorGuaranteed>;
+
+    fn diagnostic_regular(
+        &self,
+        err: DiagnosticBuilder<'tcx, ErrorGuaranteed>,
+    ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
+        err
+    }
+
+    fn diagnostic_extended(
+        &self,
+        err: DiagnosticBuilder<'tcx, ErrorGuaranteed>,
+    ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
+        err
+    }
+}