Auto merge of #119097 - nnethercote:fix-EmissionGuarantee, r=compiler…

…-errors

Fix `EmissionGuarantee`

There are some problems with the `DiagCtxt` API related to `EmissionGuarantee`. This PR fixes them.

r? `@compiler-errors`

compiler/rustc_attr/src/session_diagnostics.rs

@@ -2,7 +2,8 @@ use std::num::IntErrorKind;
 
 use rustc_ast as ast;
 use rustc_errors::{
-    error_code, Applicability, DiagCtxt, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic,
+    error_code, Applicability, DiagCtxt, DiagnosticBuilder, EmissionGuarantee, IntoDiagnostic,
+    Level,
 };
 use rustc_macros::Diagnostic;
 use rustc_span::{Span, Symbol};
@@ -50,14 +51,12 @@ pub(crate) struct UnknownMetaItem<'a> {
 }
 
 // Manual implementation to be able to format `expected` items correctly.
-impl<'a> IntoDiagnostic<'a> for UnknownMetaItem<'_> {
-    fn into_diagnostic(self, dcx: &'a DiagCtxt) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
+impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for UnknownMetaItem<'_> {
+    fn into_diagnostic(self, dcx: &'a DiagCtxt, level: Level) -> DiagnosticBuilder<'a, G> {
         let expected = self.expected.iter().map(|name| format!("`{name}`")).collect::<Vec<_>>();
-        let mut diag = dcx.struct_span_err_with_code(
-            self.span,
-            fluent::attr_unknown_meta_item,
-            error_code!(E0541),
-        );
+        let mut diag = DiagnosticBuilder::new(dcx, level, fluent::attr_unknown_meta_item);
+        diag.set_span(self.span);
+        diag.code(error_code!(E0541));
         diag.set_arg("item", self.item);
         diag.set_arg("expected", expected.join(", "));
         diag.span_label(self.span, fluent::attr_label);
@@ -200,10 +199,11 @@ pub(crate) struct UnsupportedLiteral {
     pub start_point_span: Span,
 }
 
-impl<'a> IntoDiagnostic<'a> for UnsupportedLiteral {
-    fn into_diagnostic(self, dcx: &'a DiagCtxt) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
-        let mut diag = dcx.struct_span_err_with_code(
-            self.span,
+impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for UnsupportedLiteral {
+    fn into_diagnostic(self, dcx: &'a DiagCtxt, level: Level) -> DiagnosticBuilder<'a, G> {
+        let mut diag = DiagnosticBuilder::new(
+            dcx,
+            level,
             match self.reason {
                 UnsupportedLiteralReason::Generic => fluent::attr_unsupported_literal_generic,
                 UnsupportedLiteralReason::CfgString => fluent::attr_unsupported_literal_cfg_string,
@@ -214,8 +214,9 @@ impl<'a> IntoDiagnostic<'a> for UnsupportedLiteral {
                     fluent::attr_unsupported_literal_deprecated_kv_pair
                 }
             },
-            error_code!(E0565),
         );
+        diag.set_span(self.span);
+        diag.code(error_code!(E0565));
         if self.is_bytestr {
             diag.span_suggestion(
                 self.start_point_span,

compiler/rustc_builtin_macros/src/errors.rs

@@ -1,6 +1,6 @@
 use rustc_errors::{
-    AddToDiagnostic, DiagCtxt, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic, MultiSpan,
-    SingleLabelManySpans,
+    AddToDiagnostic, DiagCtxt, DiagnosticBuilder, EmissionGuarantee, IntoDiagnostic, Level,
+    MultiSpan, SingleLabelManySpans,
 };
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::{symbol::Ident, Span, Symbol};
@@ -446,14 +446,14 @@ pub(crate) struct EnvNotDefinedWithUserMessage {
 }
 
 // Hand-written implementation to support custom user messages.
-impl<'a> IntoDiagnostic<'a> for EnvNotDefinedWithUserMessage {
+impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for EnvNotDefinedWithUserMessage {
     #[track_caller]
-    fn into_diagnostic(self, dcx: &'a DiagCtxt) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
+    fn into_diagnostic(self, dcx: &'a DiagCtxt, level: Level) -> DiagnosticBuilder<'a, G> {
         #[expect(
             rustc::untranslatable_diagnostic,
             reason = "cannot translate user-provided messages"
         )]
-        let mut diag = dcx.struct_err(self.msg_from_user.to_string());
+        let mut diag = DiagnosticBuilder::new(dcx, level, self.msg_from_user.to_string());
         diag.set_span(self.span);
         diag
     }
@@ -801,9 +801,13 @@ pub(crate) struct AsmClobberNoReg {
     pub(crate) clobbers: Vec<Span>,
 }
 
-impl<'a> IntoDiagnostic<'a> for AsmClobberNoReg {
-    fn into_diagnostic(self, dcx: &'a DiagCtxt) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
-        let mut diag = dcx.struct_err(crate::fluent_generated::builtin_macros_asm_clobber_no_reg);
+impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for AsmClobberNoReg {
+    fn into_diagnostic(self, dcx: &'a DiagCtxt, level: Level) -> DiagnosticBuilder<'a, G> {
+        let mut diag = DiagnosticBuilder::new(
+            dcx,
+            level,
+            crate::fluent_generated::builtin_macros_asm_clobber_no_reg,
+        );
         diag.set_span(self.spans.clone());
         // eager translation as `span_labels` takes `AsRef<str>`
         let lbl1 = dcx.eagerly_translate_to_string(

compiler/rustc_codegen_gcc/src/errors.rs

@@ -1,6 +1,6 @@
 use rustc_errors::{
-    DiagCtxt, DiagnosticArgValue, DiagnosticBuilder, ErrorGuaranteed, IntoDiagnostic,
-    IntoDiagnosticArg,
+    DiagCtxt, DiagnosticArgValue, DiagnosticBuilder, EmissionGuarantee, IntoDiagnostic,
+    IntoDiagnosticArg, Level,
 };
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::Span;
@@ -111,9 +111,13 @@ pub(crate) struct TargetFeatureDisableOrEnable<'a> {
 #[help(codegen_gcc_missing_features)]
 pub(crate) struct MissingFeatures;
 
-impl IntoDiagnostic<'_, ErrorGuaranteed> for TargetFeatureDisableOrEnable<'_> {
-    fn into_diagnostic(self, dcx: &'_ DiagCtxt) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = dcx.struct_err(fluent::codegen_gcc_target_feature_disable_or_enable);
+impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for TargetFeatureDisableOrEnable<'_> {
+    fn into_diagnostic(self, dcx: &'_ DiagCtxt, level: Level) -> DiagnosticBuilder<'_, G> {
+        let mut diag = DiagnosticBuilder::new(
+            dcx,
+            level,
+            fluent::codegen_gcc_target_feature_disable_or_enable
+        );
         if let Some(span) = self.span {
             diag.set_span(span);
         };

compiler/rustc_codegen_llvm/src/errors.rs

@@ -4,9 +4,7 @@ use std::path::Path;
 
 use crate::fluent_generated as fluent;
 use rustc_data_structures::small_c_str::SmallCStr;
-use rustc_errors::{
-    DiagCtxt, DiagnosticBuilder, EmissionGuarantee, ErrorGuaranteed, FatalError, IntoDiagnostic,
-};
+use rustc_errors::{DiagCtxt, DiagnosticBuilder, EmissionGuarantee, IntoDiagnostic, Level};
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::Span;
 
@@ -101,13 +99,14 @@ pub(crate) struct DynamicLinkingWithLTO;
 
 pub(crate) struct ParseTargetMachineConfig<'a>(pub LlvmError<'a>);
 
-impl IntoDiagnostic<'_, FatalError> for ParseTargetMachineConfig<'_> {
-    fn into_diagnostic(self, dcx: &'_ DiagCtxt) -> DiagnosticBuilder<'_, FatalError> {
-        let diag: DiagnosticBuilder<'_, FatalError> = self.0.into_diagnostic(dcx);
+impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for ParseTargetMachineConfig<'_> {
+    fn into_diagnostic(self, dcx: &'_ DiagCtxt, level: Level) -> DiagnosticBuilder<'_, G> {
+        let diag: DiagnosticBuilder<'_, G> = self.0.into_diagnostic(dcx, level);
         let (message, _) = diag.styled_message().first().expect("`LlvmError` with no message");
         let message = dcx.eagerly_translate_to_string(message.clone(), diag.args());
 
-        let mut diag = dcx.struct_almost_fatal(fluent::codegen_llvm_parse_target_machine_config);
+        let mut diag =
+            DiagnosticBuilder::new(dcx, level, fluent::codegen_llvm_parse_target_machine_config);
         diag.set_arg("error", message);
         diag
     }
@@ -123,9 +122,13 @@ pub(crate) struct TargetFeatureDisableOrEnable<'a> {
 #[help(codegen_llvm_missing_features)]
 pub(crate) struct MissingFeatures;
 
-impl IntoDiagnostic<'_, ErrorGuaranteed> for TargetFeatureDisableOrEnable<'_> {
-    fn into_diagnostic(self, dcx: &'_ DiagCtxt) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = dcx.struct_err(fluent::codegen_llvm_target_feature_disable_or_enable);
+impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for TargetFeatureDisableOrEnable<'_> {
+    fn into_diagnostic(self, dcx: &'_ DiagCtxt, level: Level) -> DiagnosticBuilder<'_, G> {
+        let mut diag = DiagnosticBuilder::new(
+            dcx,
+            level,
+            fluent::codegen_llvm_target_feature_disable_or_enable,
+        );
         if let Some(span) = self.span {
             diag.set_span(span);
         };
@@ -184,7 +187,7 @@ pub enum LlvmError<'a> {
 pub(crate) struct WithLlvmError<'a>(pub LlvmError<'a>, pub String);
 
 impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for WithLlvmError<'_> {
-    fn into_diagnostic(self, dcx: &'_ DiagCtxt) -> DiagnosticBuilder<'_, G> {
+    fn into_diagnostic(self, dcx: &'_ DiagCtxt, level: Level) -> DiagnosticBuilder<'_, G> {
         use LlvmError::*;
         let msg_with_llvm_err = match &self.0 {
             WriteOutput { .. } => fluent::codegen_llvm_write_output_with_llvm_err,
@@ -201,7 +204,7 @@ impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for WithLlvmError<'_> {
             PrepareThinLtoModule => fluent::codegen_llvm_prepare_thin_lto_module_with_llvm_err,
             ParseBitcode => fluent::codegen_llvm_parse_bitcode_with_llvm_err,
         };
-        let mut diag = self.0.into_diagnostic(dcx);
+        let mut diag = self.0.into_diagnostic(dcx, level);
         diag.set_primary_message(msg_with_llvm_err);
         diag.set_arg("llvm_err", self.1);
         diag