Rollup merge of rust-lang#118587 - nnethercote:cleanup-error-handlers…

…-2, r=compiler-errors

Cleanup error handlers some more

A sequel to rust-lang#118470.

r? `@compiler-errors`

compiler/rustc_builtin_macros/src/errors.rs

@@ -1,5 +1,5 @@
 use rustc_errors::{
-    AddToDiagnostic, DiagnosticBuilder, EmissionGuarantee, Handler, IntoDiagnostic, MultiSpan,
+    AddToDiagnostic, DiagnosticBuilder, ErrorGuaranteed, Handler, IntoDiagnostic, MultiSpan,
     SingleLabelManySpans,
 };
 use rustc_macros::{Diagnostic, Subdiagnostic};
@@ -446,9 +446,9 @@ pub(crate) struct EnvNotDefinedWithUserMessage {
 }
 
 // Hand-written implementation to support custom user messages.
-impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for EnvNotDefinedWithUserMessage {
+impl<'a> IntoDiagnostic<'a> for EnvNotDefinedWithUserMessage {
     #[track_caller]
-    fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'a, G> {
+    fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
         #[expect(
             rustc::untranslatable_diagnostic,
             reason = "cannot translate user-provided messages"
@@ -801,8 +801,8 @@ pub(crate) struct AsmClobberNoReg {
     pub(crate) clobbers: Vec<Span>,
 }
 
-impl<'a, G: EmissionGuarantee> IntoDiagnostic<'a, G> for AsmClobberNoReg {
-    fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'a, G> {
+impl<'a> IntoDiagnostic<'a> for AsmClobberNoReg {
+    fn into_diagnostic(self, handler: &'a Handler) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
         let mut diag =
             handler.struct_diagnostic(crate::fluent_generated::builtin_macros_asm_clobber_no_reg);
         diag.set_span(self.spans.clone());

compiler/rustc_codegen_cranelift/src/concurrency_limiter.rs

@@ -64,7 +64,7 @@ impl ConcurrencyLimiter {
                     // Make sure to drop the mutex guard first to prevent poisoning the mutex.
                     drop(state);
                     if let Some(err) = err {
-                        handler.fatal(err).raise();
+                        handler.fatal(err);
                     } else {
                         // The error was already emitted, but compilation continued. Raise a silent
                         // fatal error.

compiler/rustc_codegen_gcc/src/errors.rs

@@ -111,8 +111,8 @@ pub(crate) struct TargetFeatureDisableOrEnable<'a> {
 pub(crate) struct MissingFeatures;
 
 impl IntoDiagnostic<'_, ErrorGuaranteed> for TargetFeatureDisableOrEnable<'_> {
-    fn into_diagnostic(self, sess: &'_ Handler) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = sess.struct_err(fluent::codegen_gcc_target_feature_disable_or_enable);
+    fn into_diagnostic(self, handler: &'_ Handler) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
+        let mut diag = handler.struct_err(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

@@ -5,7 +5,7 @@ use std::path::Path;
 use crate::fluent_generated as fluent;
 use rustc_data_structures::small_c_str::SmallCStr;
 use rustc_errors::{
-    DiagnosticBuilder, EmissionGuarantee, ErrorGuaranteed, Handler, IntoDiagnostic,
+    DiagnosticBuilder, EmissionGuarantee, ErrorGuaranteed, FatalError, Handler, IntoDiagnostic,
 };
 use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::Span;
@@ -101,13 +101,13 @@ pub(crate) struct DynamicLinkingWithLTO;
 
 pub(crate) struct ParseTargetMachineConfig<'a>(pub LlvmError<'a>);
 
-impl<EM: EmissionGuarantee> IntoDiagnostic<'_, EM> for ParseTargetMachineConfig<'_> {
-    fn into_diagnostic(self, sess: &'_ Handler) -> DiagnosticBuilder<'_, EM> {
-        let diag: DiagnosticBuilder<'_, EM> = self.0.into_diagnostic(sess);
+impl IntoDiagnostic<'_, FatalError> for ParseTargetMachineConfig<'_> {
+    fn into_diagnostic(self, handler: &'_ Handler) -> DiagnosticBuilder<'_, FatalError> {
+        let diag: DiagnosticBuilder<'_, FatalError> = self.0.into_diagnostic(handler);
         let (message, _) = diag.styled_message().first().expect("`LlvmError` with no message");
-        let message = sess.eagerly_translate_to_string(message.clone(), diag.args());
+        let message = handler.eagerly_translate_to_string(message.clone(), diag.args());
 
-        let mut diag = sess.struct_diagnostic(fluent::codegen_llvm_parse_target_machine_config);
+        let mut diag = handler.struct_diagnostic(fluent::codegen_llvm_parse_target_machine_config);
         diag.set_arg("error", message);
         diag
     }
@@ -124,8 +124,8 @@ pub(crate) struct TargetFeatureDisableOrEnable<'a> {
 pub(crate) struct MissingFeatures;
 
 impl IntoDiagnostic<'_, ErrorGuaranteed> for TargetFeatureDisableOrEnable<'_> {
-    fn into_diagnostic(self, sess: &'_ Handler) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
-        let mut diag = sess.struct_err(fluent::codegen_llvm_target_feature_disable_or_enable);
+    fn into_diagnostic(self, handler: &'_ Handler) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
+        let mut diag = handler.struct_err(fluent::codegen_llvm_target_feature_disable_or_enable);
         if let Some(span) = self.span {
             diag.set_span(span);
         };
@@ -183,8 +183,8 @@ pub enum LlvmError<'a> {
 
 pub(crate) struct WithLlvmError<'a>(pub LlvmError<'a>, pub String);
 
-impl<EM: EmissionGuarantee> IntoDiagnostic<'_, EM> for WithLlvmError<'_> {
-    fn into_diagnostic(self, sess: &'_ Handler) -> DiagnosticBuilder<'_, EM> {
+impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for WithLlvmError<'_> {
+    fn into_diagnostic(self, handler: &'_ Handler) -> DiagnosticBuilder<'_, G> {
         use LlvmError::*;
         let msg_with_llvm_err = match &self.0 {
             WriteOutput { .. } => fluent::codegen_llvm_write_output_with_llvm_err,
@@ -201,7 +201,7 @@ impl<EM: EmissionGuarantee> IntoDiagnostic<'_, EM> 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(sess);
+        let mut diag = self.0.into_diagnostic(handler);
         diag.set_primary_message(msg_with_llvm_err);
         diag.set_arg("llvm_err", self.1);
         diag

compiler/rustc_errors/src/diagnostic.rs

@@ -239,7 +239,7 @@ impl Diagnostic {
     }
 
     #[track_caller]
-    pub fn new_with_code<M: Into<DiagnosticMessage>>(
+    pub(crate) fn new_with_code<M: Into<DiagnosticMessage>>(
         level: Level,
         code: Option<DiagnosticId>,
         message: M,
@@ -281,7 +281,7 @@ impl Diagnostic {
         }
     }
 
-    pub fn update_unstable_expectation_id(
+    pub(crate) fn update_unstable_expectation_id(
         &mut self,
         unstable_to_stable: &FxHashMap<LintExpectationId, LintExpectationId>,
     ) {
@@ -307,14 +307,14 @@ impl Diagnostic {
     }
 
     /// Indicates whether this diagnostic should show up in cargo's future breakage report.
-    pub fn has_future_breakage(&self) -> bool {
+    pub(crate) fn has_future_breakage(&self) -> bool {
         match self.code {
             Some(DiagnosticId::Lint { has_future_breakage, .. }) => has_future_breakage,
             _ => false,
         }
     }
 
-    pub fn is_force_warn(&self) -> bool {
+    pub(crate) fn is_force_warn(&self) -> bool {
         match self.code {
             Some(DiagnosticId::Lint { is_force_warn, .. }) => is_force_warn,
             _ => false,
@@ -391,29 +391,6 @@ impl Diagnostic {
         self.note_expected_found_extra(expected_label, expected, found_label, found, &"", &"")
     }
 
-    pub fn note_unsuccessful_coercion(
-        &mut self,
-        expected: DiagnosticStyledString,
-        found: DiagnosticStyledString,
-    ) -> &mut Self {
-        let mut msg: Vec<_> =
-            vec![(Cow::from("required when trying to coerce from type `"), Style::NoStyle)];
-        msg.extend(expected.0.iter().map(|x| match *x {
-            StringPart::Normal(ref s) => (Cow::from(s.clone()), Style::NoStyle),
-            StringPart::Highlighted(ref s) => (Cow::from(s.clone()), Style::Highlight),
-        }));
-        msg.push((Cow::from("` to type '"), Style::NoStyle));
-        msg.extend(found.0.iter().map(|x| match *x {
-            StringPart::Normal(ref s) => (Cow::from(s.clone()), Style::NoStyle),
-            StringPart::Highlighted(ref s) => (Cow::from(s.clone()), Style::Highlight),
-        }));
-        msg.push((Cow::from("`"), Style::NoStyle));
-
-        // For now, just attach these as notes
-        self.highlighted_note(msg);
-        self
-    }
-
     pub fn note_expected_found_extra(
         &mut self,
         expected_label: &dyn fmt::Display,
@@ -475,7 +452,7 @@ impl Diagnostic {
         self
     }
 
-    pub fn highlighted_note<M: Into<SubdiagnosticMessage>>(
+    fn highlighted_note<M: Into<SubdiagnosticMessage>>(
         &mut self,
         msg: Vec<(M, Style)>,
     ) -> &mut Self {
@@ -572,14 +549,6 @@ impl Diagnostic {
         self
     }
 
-    /// Clear any existing suggestions.
-    pub fn clear_suggestions(&mut self) -> &mut Self {
-        if let Ok(suggestions) = &mut self.suggestions {
-            suggestions.clear();
-        }
-        self
-    }
-
     /// Helper for pushing to `self.suggestions`, if available (not disable).
     fn push_suggestion(&mut self, suggestion: CodeSuggestion) {
         if let Ok(suggestions) = &mut self.suggestions {
@@ -992,7 +961,7 @@ impl Diagnostic {
     /// Helper function that takes a `SubdiagnosticMessage` and returns a `DiagnosticMessage` by
     /// combining it with the primary message of the diagnostic (if translatable, otherwise it just
     /// passes the user's string along).
-    pub(crate) fn subdiagnostic_message_to_diagnostic_message(
+    fn subdiagnostic_message_to_diagnostic_message(
         &self,
         attr: impl Into<SubdiagnosticMessage>,
     ) -> DiagnosticMessage {