Miscellaneous diagnostics cleanups

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -198,12 +198,12 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                     {
                         let span = self.body.local_decls[local].source_info.span;
                         mut_error = Some(span);
-                        if let Some((buffer, c)) = self.get_buffered_mut_error(span) {
+                        if let Some((buffered_err, c)) = self.get_buffered_mut_error(span) {
                             // We've encountered a second (or more) attempt to mutably borrow an
                             // immutable binding, so the likely problem is with the binding
                             // declaration, not the use. We collect these in a single diagnostic
                             // and make the binding the primary span of the error.
-                            err = buffer;
+                            err = buffered_err;
                             count = c + 1;
                             if count == 2 {
                                 err.replace_span_with(span, false);

compiler/rustc_codegen_llvm/src/errors.rs

@@ -102,7 +102,7 @@ pub(crate) struct ParseTargetMachineConfig<'a>(pub LlvmError<'a>);
 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.messages().first().expect("`LlvmError` with no message");
+        let (message, _) = diag.messages.first().expect("`LlvmError` with no message");
         let message = dcx.eagerly_translate_to_string(message.clone(), diag.args());
 
         DiagnosticBuilder::new(dcx, level, fluent::codegen_llvm_parse_target_machine_config)

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -39,7 +39,6 @@ use rustc_target::spec::{MergeFunctions, SanitizerSet};
 
 use crate::errors::ErrorCreatingRemarkDir;
 use std::any::Any;
-use std::borrow::Cow;
 use std::fs;
 use std::io;
 use std::marker::PhantomData;
@@ -1812,12 +1811,12 @@ impl Translate for SharedEmitter {
 
 impl Emitter for SharedEmitter {
     fn emit_diagnostic(&mut self, diag: &rustc_errors::Diagnostic) {
-        let args: FxHashMap<Cow<'_, str>, DiagnosticArgValue> =
+        let args: FxHashMap<DiagnosticArgName, DiagnosticArgValue> =
             diag.args().map(|(name, arg)| (name.clone(), arg.clone())).collect();
         drop(self.sender.send(SharedEmitterMessage::Diagnostic(Diagnostic {
             msgs: diag.messages.clone(),
             args: args.clone(),
-            code: diag.code.clone(),
+            code: diag.code,
             lvl: diag.level(),
         })));
         for child in &diag.children {

compiler/rustc_const_eval/src/const_eval/error.rs

@@ -1,6 +1,8 @@
 use std::mem;
 
-use rustc_errors::{DiagnosticArgValue, DiagnosticMessage, IntoDiagnostic, IntoDiagnosticArg};
+use rustc_errors::{
+    DiagnosticArgName, DiagnosticArgValue, DiagnosticMessage, IntoDiagnostic, IntoDiagnosticArg,
+};
 use rustc_hir::CRATE_HIR_ID;
 use rustc_middle::mir::AssertKind;
 use rustc_middle::query::TyCtxtAt;
@@ -32,10 +34,7 @@ impl MachineStopType for ConstEvalErrKind {
             AssertFailure(x) => x.diagnostic_message(),
         }
     }
-    fn add_args(
-        self: Box<Self>,
-        adder: &mut dyn FnMut(std::borrow::Cow<'static, str>, DiagnosticArgValue),
-    ) {
+    fn add_args(self: Box<Self>, adder: &mut dyn FnMut(DiagnosticArgName, DiagnosticArgValue)) {
         use ConstEvalErrKind::*;
         match *self {
             ConstAccessesStatic | ModifiedGlobal => {}

compiler/rustc_errors/src/diagnostic.rs

@@ -33,7 +33,10 @@ pub type DiagnosticArgName = Cow<'static, str>;
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
 pub enum DiagnosticArgValue {
     Str(Cow<'static, str>),
-    Number(i128),
+    // This gets converted to a `FluentNumber`, which is an `f64`. An `i32`
+    // safely fits in an `f64`. Any integers bigger than that will be converted
+    // to strings in `into_diagnostic_arg` and stored using the `Str` variant.
+    Number(i32),
     StrListSepByAnd(Vec<Cow<'static, str>>),
 }
 
@@ -113,7 +116,7 @@ pub struct Diagnostic {
 
     /// With `-Ztrack_diagnostics` enabled,
     /// we print where in rustc this error was emitted.
-    pub emitted_at: DiagnosticLocation,
+    pub(crate) emitted_at: DiagnosticLocation,
 }
 
 #[derive(Clone, Debug, Encodable, Decodable)]
@@ -162,10 +165,10 @@ impl DiagnosticStyledString {
         DiagnosticStyledString(vec![])
     }
     pub fn push_normal<S: Into<String>>(&mut self, t: S) {
-        self.0.push(StringPart::Normal(t.into()));
+        self.0.push(StringPart::normal(t));
     }
     pub fn push_highlighted<S: Into<String>>(&mut self, t: S) {
-        self.0.push(StringPart::Highlighted(t.into()));
+        self.0.push(StringPart::highlighted(t));
     }
     pub fn push<S: Into<String>>(&mut self, t: S, highlight: bool) {
         if highlight {
@@ -175,35 +178,34 @@ impl DiagnosticStyledString {
         }
     }
     pub fn normal<S: Into<String>>(t: S) -> DiagnosticStyledString {
-        DiagnosticStyledString(vec![StringPart::Normal(t.into())])
+        DiagnosticStyledString(vec![StringPart::normal(t)])
     }
 
     pub fn highlighted<S: Into<String>>(t: S) -> DiagnosticStyledString {
-        DiagnosticStyledString(vec![StringPart::Highlighted(t.into())])
+        DiagnosticStyledString(vec![StringPart::highlighted(t)])
     }
 
     pub fn content(&self) -> String {
-        self.0.iter().map(|x| x.content()).collect::<String>()
+        self.0.iter().map(|x| x.content.as_str()).collect::<String>()
     }
 }
 
 #[derive(Debug, PartialEq, Eq)]
-pub enum StringPart {
-    Normal(String),
-    Highlighted(String),
+pub struct StringPart {
+    content: String,
+    style: Style,
 }
 
 impl StringPart {
-    pub fn content(&self) -> &str {
-        match self {
-            &StringPart::Normal(ref s) | &StringPart::Highlighted(ref s) => s,
-        }
+    pub fn normal<S: Into<String>>(content: S) -> StringPart {
+        StringPart { content: content.into(), style: Style::NoStyle }
+    }
+
+    pub fn highlighted<S: Into<String>>(content: S) -> StringPart {
+        StringPart { content: content.into(), style: Style::Highlight }
     }
 }
 
-// Note: most of these methods are setters that return `&mut Self`. The small
-// number of simple getter functions all have `get_` prefixes to distinguish
-// them from the setters.
 impl Diagnostic {
     #[track_caller]
     pub fn new<M: Into<DiagnosticMessage>>(level: Level, message: M) -> Self {
@@ -389,19 +391,16 @@ impl Diagnostic {
         } else {
             (0, found_label.len() - expected_label.len())
         };
-        let mut msg: Vec<_> =
-            vec![(format!("{}{} `", " ".repeat(expected_padding), expected_label), Style::NoStyle)];
-        msg.extend(expected.0.iter().map(|x| match *x {
-            StringPart::Normal(ref s) => (s.to_owned(), Style::NoStyle),
-            StringPart::Highlighted(ref s) => (s.to_owned(), Style::Highlight),
-        }));
-        msg.push((format!("`{expected_extra}\n"), Style::NoStyle));
-        msg.push((format!("{}{} `", " ".repeat(found_padding), found_label), Style::NoStyle));
-        msg.extend(found.0.iter().map(|x| match *x {
-            StringPart::Normal(ref s) => (s.to_owned(), Style::NoStyle),
-            StringPart::Highlighted(ref s) => (s.to_owned(), Style::Highlight),
-        }));
-        msg.push((format!("`{found_extra}"), Style::NoStyle));
+        let mut msg = vec![StringPart::normal(format!(
+            "{}{} `",
+            " ".repeat(expected_padding),
+            expected_label
+        ))];
+        msg.extend(expected.0.into_iter());
+        msg.push(StringPart::normal(format!("`{expected_extra}\n")));
+        msg.push(StringPart::normal(format!("{}{} `", " ".repeat(found_padding), found_label)));
+        msg.extend(found.0.into_iter());
+        msg.push(StringPart::normal(format!("`{found_extra}")));
 
         // For now, just attach these as notes.
         self.highlighted_note(msg);
@@ -410,9 +409,9 @@ impl Diagnostic {
 
     pub fn note_trait_signature(&mut self, name: Symbol, signature: String) -> &mut Self {
         self.highlighted_note(vec![
-            (format!("`{name}` from trait: `"), Style::NoStyle),
-            (signature, Style::Highlight),
-            ("`".to_string(), Style::NoStyle),
+            StringPart::normal(format!("`{name}` from trait: `")),
+            StringPart::highlighted(signature),
+            StringPart::normal("`"),
         ]);
         self
     }
@@ -424,10 +423,7 @@ impl Diagnostic {
         self
     }
 
-    fn highlighted_note<M: Into<SubdiagnosticMessage>>(
-        &mut self,
-        msg: Vec<(M, Style)>,
-    ) -> &mut Self {
+    fn highlighted_note(&mut self, msg: Vec<StringPart>) -> &mut Self {
         self.sub_with_highlights(Level::Note, msg, MultiSpan::new());
         self
     }
@@ -496,7 +492,7 @@ impl Diagnostic {
     }
 
     /// Add a help message attached to this diagnostic with a customizable highlighted message.
-    pub fn highlighted_help(&mut self, msg: Vec<(String, Style)>) -> &mut Self {
+    pub fn highlighted_help(&mut self, msg: Vec<StringPart>) -> &mut Self {
         self.sub_with_highlights(Level::Help, msg, MultiSpan::new());
         self
     }
@@ -890,15 +886,6 @@ impl Diagnostic {
         self
     }
 
-    pub fn clear_code(&mut self) -> &mut Self {
-        self.code = None;
-        self
-    }
-
-    pub fn get_code(&self) -> Option<ErrCode> {
-        self.code
-    }
-
     pub fn primary_message(&mut self, msg: impl Into<DiagnosticMessage>) -> &mut Self {
         self.messages[0] = (msg.into(), Style::NoStyle);
         self
@@ -913,7 +900,7 @@ impl Diagnostic {
 
     pub fn arg(
         &mut self,
-        name: impl Into<Cow<'static, str>>,
+        name: impl Into<DiagnosticArgName>,
         arg: impl IntoDiagnosticArg,
     ) -> &mut Self {
         self.args.insert(name.into(), arg.into_diagnostic_arg());
@@ -924,10 +911,6 @@ impl Diagnostic {
         self.args = args;
     }
 
-    pub fn messages(&self) -> &[(DiagnosticMessage, Style)] {
-        &self.messages
-    }
-
     /// 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).
@@ -958,15 +941,10 @@ impl Diagnostic {
 
     /// Convenience function for internal use, clients should use one of the
     /// public methods above.
-    fn sub_with_highlights<M: Into<SubdiagnosticMessage>>(
-        &mut self,
-        level: Level,
-        messages: Vec<(M, Style)>,
-        span: MultiSpan,
-    ) {
+    fn sub_with_highlights(&mut self, level: Level, messages: Vec<StringPart>, span: MultiSpan) {
         let messages = messages
             .into_iter()
-            .map(|m| (self.subdiagnostic_message_to_diagnostic_message(m.0), m.1))
+            .map(|m| (self.subdiagnostic_message_to_diagnostic_message(m.content), m.style))
             .collect();
         let sub = SubDiagnostic { level, messages, span };
         self.children.push(sub);

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -63,12 +63,8 @@ macro_rules! into_diagnostic_arg_for_number {
         $(
             impl IntoDiagnosticArg for $ty {
                 fn into_diagnostic_arg(self) -> DiagnosticArgValue {
-                    // HACK: `FluentNumber` the underline backing struct represent
-                    // numbers using a f64 which can't represent all the i128 numbers
-                    // So in order to be able to use fluent selectors and still
-                    // have all the numbers representable we only convert numbers
-                    // below a certain threshold.
-                    if let Ok(n) = TryInto::<i128>::try_into(self) && n >= -100 && n <= 100 {
+                    // Convert to a string if it won't fit into `Number`.
+                    if let Ok(n) = TryInto::<i32>::try_into(self) {
                         DiagnosticArgValue::Number(n)
                     } else {
                         self.to_string().into_diagnostic_arg()

compiler/rustc_errors/src/emitter.rs

@@ -558,7 +558,7 @@ impl Emitter for HumanEmitter {
 /// failures of rustc, as witnessed e.g. in issue #89358.
 pub struct SilentEmitter {
     pub fatal_dcx: DiagCtxt,
-    pub fatal_note: Option<String>,
+    pub fatal_note: String,
 }
 
 impl Translate for SilentEmitter {
@@ -576,13 +576,11 @@ impl Emitter for SilentEmitter {
         None
     }
 
-    fn emit_diagnostic(&mut self, d: &Diagnostic) {
-        if d.level == Level::Fatal {
-            let mut d = d.clone();
-            if let Some(ref note) = self.fatal_note {
-                d.note(note.clone());
-            }
-            self.fatal_dcx.emit_diagnostic(d);
+    fn emit_diagnostic(&mut self, diag: &Diagnostic) {
+        if diag.level == Level::Fatal {
+            let mut diag = diag.clone();
+            diag.note(self.fatal_note.clone());
+            self.fatal_dcx.emit_diagnostic(diag);
         }
     }
 }