Refactor: Rename db locals to diag

https://github.com/rust-lang/rust/pull/64272 replaced
`DiagnosticBuilder` with `Diagnostic` in some places. This commit just
renames the DB variable from `db` to `diag` where it wasn't renamed.

src/librustc_codegen_ssa/back/write.rs

@@ -1667,13 +1667,13 @@ impl SharedEmitter {
 }
 
 impl Emitter for SharedEmitter {
-    fn emit_diagnostic(&mut self, db: &rustc_errors::Diagnostic) {
+    fn emit_diagnostic(&mut self, diag: &rustc_errors::Diagnostic) {
         drop(self.sender.send(SharedEmitterMessage::Diagnostic(Diagnostic {
-            msg: db.message(),
-            code: db.code.clone(),
-            lvl: db.level,
+            msg: diag.message(),
+            code: diag.code.clone(),
+            lvl: diag.level,
         })));
-        for child in &db.children {
+        for child in &diag.children {
             drop(self.sender.send(SharedEmitterMessage::Diagnostic(Diagnostic {
                 msg: child.message(),
                 code: None,

src/librustc_errors/annotate_snippet_emitter_writer.rs

@@ -31,19 +31,19 @@ pub struct AnnotateSnippetEmitterWriter {
 
 impl Emitter for AnnotateSnippetEmitterWriter {
     /// The entry point for the diagnostics generation
-    fn emit_diagnostic(&mut self, db: &Diagnostic) {
-        let mut children = db.children.clone();
-        let (mut primary_span, suggestions) = self.primary_span_formatted(&db);
+    fn emit_diagnostic(&mut self, diag: &Diagnostic) {
+        let mut children = diag.children.clone();
+        let (mut primary_span, suggestions) = self.primary_span_formatted(&diag);
 
         self.fix_multispans_in_std_macros(&self.source_map,
                                           &mut primary_span,
                                           &mut children,
-                                          &db.level,
+                                          &diag.level,
                                           self.external_macro_backtrace);
 
-        self.emit_messages_default(&db.level,
-                                   db.message(),
-                                   &db.code,
+        self.emit_messages_default(&diag.level,
+                                   diag.message(),
+                                   &diag.code,
                                    &primary_span,
                                    &children,
                                    &suggestions);

src/librustc_errors/emitter.rs

@@ -180,7 +180,7 @@ const ANONYMIZED_LINE_NUM: &str = "LL";
 /// Emitter trait for emitting errors.
 pub trait Emitter {
     /// Emit a structured diagnostic.
-    fn emit_diagnostic(&mut self, db: &Diagnostic);
+    fn emit_diagnostic(&mut self, diag: &Diagnostic);
 
     /// Emit a notification that an artifact has been output.
     /// This is currently only supported for the JSON format,
@@ -206,10 +206,10 @@ pub trait Emitter {
     ///   we return the original `primary_span` and the original suggestions.
     fn primary_span_formatted<'a>(
         &mut self,
-        db: &'a Diagnostic,
+        diag: &'a Diagnostic,
     ) -> (MultiSpan, &'a [CodeSuggestion]) {
-        let mut primary_span = db.span.clone();
-        if let Some((sugg, rest)) = db.suggestions.split_first() {
+        let mut primary_span = diag.span.clone();
+        if let Some((sugg, rest)) = diag.suggestions.split_first() {
             if rest.is_empty() &&
                // ^ if there is only one suggestion
                // don't display multi-suggestions as labels
@@ -260,10 +260,10 @@ pub trait Emitter {
                 // to be consistent. We could try to figure out if we can
                 // make one (or the first one) inline, but that would give
                 // undue importance to a semi-random suggestion
-                (primary_span, &db.suggestions)
+                (primary_span, &diag.suggestions)
             }
         } else {
-            (primary_span, &db.suggestions)
+            (primary_span, &diag.suggestions)
         }
     }
 
@@ -401,19 +401,19 @@ impl Emitter for EmitterWriter {
         self.sm.as_ref()
     }
 
-    fn emit_diagnostic(&mut self, db: &Diagnostic) {
-        let mut children = db.children.clone();
-        let (mut primary_span, suggestions) = self.primary_span_formatted(&db);
+    fn emit_diagnostic(&mut self, diag: &Diagnostic) {
+        let mut children = diag.children.clone();
+        let (mut primary_span, suggestions) = self.primary_span_formatted(&diag);
 
         self.fix_multispans_in_std_macros(&self.sm,
                                           &mut primary_span,
                                           &mut children,
-                                          &db.level,
+                                          &diag.level,
                                           self.external_macro_backtrace);
 
-        self.emit_messages_default(&db.level,
-                                   &db.styled_message(),
-                                   &db.code,
+        self.emit_messages_default(&diag.level,
+                                   &diag.styled_message(),
+                                   &diag.code,
                                    &primary_span,
                                    &children,
                                    &suggestions);

src/libsyntax/json.rs

@@ -89,8 +89,8 @@ impl JsonEmitter {
 }
 
 impl Emitter for JsonEmitter {
-    fn emit_diagnostic(&mut self, db: &errors::Diagnostic) {
-        let data = Diagnostic::from_errors_diagnostic(db, self);
+    fn emit_diagnostic(&mut self, diag: &errors::Diagnostic) {
+        let data = Diagnostic::from_errors_diagnostic(diag, self);
         let result = if self.pretty {
             writeln!(&mut self.dst, "{}", as_pretty_json(&data))
         } else {
@@ -209,10 +209,10 @@ struct ArtifactNotification<'a> {
 }
 
 impl Diagnostic {
-    fn from_errors_diagnostic(db: &errors::Diagnostic,
+    fn from_errors_diagnostic(diag: &errors::Diagnostic,
                                je: &JsonEmitter)
                                -> Diagnostic {
-        let sugg = db.suggestions.iter().map(|sugg| {
+        let sugg = diag.suggestions.iter().map(|sugg| {
             Diagnostic {
                 message: sugg.msg.clone(),
                 code: None,
@@ -241,30 +241,30 @@ impl Diagnostic {
         let output = buf.clone();
         je.json_rendered.new_emitter(
             Box::new(buf), Some(je.sm.clone()), false, None, je.external_macro_backtrace
-        ).ui_testing(je.ui_testing).emit_diagnostic(db);
+        ).ui_testing(je.ui_testing).emit_diagnostic(diag);
         let output = Arc::try_unwrap(output.0).unwrap().into_inner().unwrap();
         let output = String::from_utf8(output).unwrap();
 
         Diagnostic {
-            message: db.message(),
-            code: DiagnosticCode::map_opt_string(db.code.clone(), je),
-            level: db.level.to_str(),
-            spans: DiagnosticSpan::from_multispan(&db.span, je),
-            children: db.children.iter().map(|c| {
+            message: diag.message(),
+            code: DiagnosticCode::map_opt_string(diag.code.clone(), je),
+            level: diag.level.to_str(),
+            spans: DiagnosticSpan::from_multispan(&diag.span, je),
+            children: diag.children.iter().map(|c| {
                 Diagnostic::from_sub_diagnostic(c, je)
             }).chain(sugg).collect(),
             rendered: Some(output),
         }
     }
 
-    fn from_sub_diagnostic(db: &SubDiagnostic, je: &JsonEmitter) -> Diagnostic {
+    fn from_sub_diagnostic(diag: &SubDiagnostic, je: &JsonEmitter) -> Diagnostic {
         Diagnostic {
-            message: db.message(),
+            message: diag.message(),
             code: None,
-            level: db.level.to_str(),
-            spans: db.render_span.as_ref()
+            level: diag.level.to_str(),
+            spans: diag.render_span.as_ref()
                      .map(|sp| DiagnosticSpan::from_multispan(sp, je))
-                     .unwrap_or_else(|| DiagnosticSpan::from_multispan(&db.span, je)),
+                     .unwrap_or_else(|| DiagnosticSpan::from_multispan(&diag.span, je)),
             children: vec![],
             rendered: None,
         }