Shorten some error invocations.

- `struct_foo` + `emit` -> `foo`
- `create_foo` + `emit` -> `emit_foo`

I have made recent commits in other PRs that have removed some of these
shortcuts for combinations with few uses, e.g.
`struct_span_err_with_code`. But for the remaining combinations that
have high levels of use, we might as well use them wherever possible.

compiler/rustc_builtin_macros/src/source_util.rs

@@ -155,7 +155,7 @@ pub fn expand_include<'cx>(
                         if self.p.token != token::Eof {
                             let token = pprust::token_to_string(&self.p.token);
                             let msg = format!("expected item, found `{token}`");
-                            self.p.dcx().struct_span_err(self.p.token.span, msg).emit();
+                            self.p.dcx().span_err(self.p.token.span, msg);
                         }
 
                         break;

compiler/rustc_expand/src/mbe/diagnostics.rs

@@ -180,7 +180,7 @@ impl<'a, 'cx, 'matcher> Tracker<'matcher> for CollectTrackerAndEmitter<'a, 'cx,
             }
             Error(err_sp, msg) => {
                 let span = err_sp.substitute_dummy(self.root_span);
-                self.cx.dcx().struct_span_err(span, msg.clone()).emit();
+                self.cx.dcx().span_err(span, msg.clone());
                 self.result = Some(DummyResult::any(span));
             }
             ErrorReported(_) => self.result = Some(DummyResult::any(self.root_span)),

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -458,7 +458,7 @@ pub fn compile_declarative_macro(
                 return dummy_syn_ext();
             }
             Error(sp, msg) => {
-                sess.dcx().struct_span_err(sp.substitute_dummy(def.span), msg).emit();
+                sess.dcx().span_err(sp.substitute_dummy(def.span), msg);
                 return dummy_syn_ext();
             }
             ErrorReported(_) => {

compiler/rustc_hir_analysis/src/check/intrinsic.rs

@@ -552,7 +552,7 @@ pub fn check_platform_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>)
         sym::simd_shuffle_generic => (2, 1, vec![param(0), param(0)], param(1)),
         _ => {
             let msg = format!("unrecognized platform-specific intrinsic function: `{name}`");
-            tcx.dcx().struct_span_err(it.span, msg).emit();
+            tcx.dcx().span_err(it.span, msg);
             return;
         }
     };

compiler/rustc_hir_analysis/src/check/intrinsicck.rs

@@ -325,7 +325,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
                         op.is_clobber(),
                     ) {
                         let msg = format!("cannot use register `{}`: {}", reg.name(), msg);
-                        self.tcx.dcx().struct_span_err(*op_sp, msg).emit();
+                        self.tcx.dcx().span_err(*op_sp, msg);
                         continue;
                     }
                 }
@@ -364,7 +364,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
                                 reg_class.name(),
                                 feature
                             );
-                            self.tcx.dcx().struct_span_err(*op_sp, msg).emit();
+                            self.tcx.dcx().span_err(*op_sp, msg);
                             // register isn't enabled, don't do more checks
                             continue;
                         }
@@ -378,7 +378,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
                                     .intersperse(", ")
                                     .collect::<String>(),
                             );
-                            self.tcx.dcx().struct_span_err(*op_sp, msg).emit();
+                            self.tcx.dcx().span_err(*op_sp, msg);
                             // register isn't enabled, don't do more checks
                             continue;
                         }

compiler/rustc_resolve/src/imports.rs

@@ -1371,12 +1371,12 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         let ImportKind::Glob { id, is_prelude, .. } = import.kind else { unreachable!() };
 
         let ModuleOrUniformRoot::Module(module) = import.imported_module.get().unwrap() else {
-            self.dcx().create_err(CannotGlobImportAllCrates { span: import.span }).emit();
+            self.dcx().emit_err(CannotGlobImportAllCrates { span: import.span });
             return;
         };
 
         if module.is_trait() {
-            self.dcx().create_err(ItemsInTraitsAreNotImportable { span: import.span }).emit();
+            self.dcx().emit_err(ItemsInTraitsAreNotImportable { span: import.span });
             return;
         } else if module == import.parent_scope.module {
             return;

compiler/rustc_resolve/src/late.rs

@@ -2301,7 +2301,7 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> {
             let report_error = |this: &Self, ns| {
                 if this.should_report_errs() {
                     let what = if ns == TypeNS { "type parameters" } else { "local variables" };
-                    this.r.dcx().create_err(ImportsCannotReferTo { span: ident.span, what }).emit();
+                    this.r.dcx().emit_err(ImportsCannotReferTo { span: ident.span, what });
                 }
             };
 

compiler/rustc_session/src/session.rs

@@ -1447,7 +1447,7 @@ impl EarlyDiagCtxt {
     #[allow(rustc::untranslatable_diagnostic)]
     #[allow(rustc::diagnostic_outside_of_impl)]
     pub fn early_note(&self, msg: impl Into<DiagnosticMessage>) {
-        self.dcx.struct_note(msg).emit()
+        self.dcx.note(msg)
     }
 
     #[allow(rustc::untranslatable_diagnostic)]
@@ -1460,13 +1460,13 @@ impl EarlyDiagCtxt {
     #[allow(rustc::diagnostic_outside_of_impl)]
     #[must_use = "ErrorGuaranteed must be returned from `run_compiler` in order to exit with a non-zero status code"]
     pub fn early_err(&self, msg: impl Into<DiagnosticMessage>) -> ErrorGuaranteed {
-        self.dcx.struct_err(msg).emit()
+        self.dcx.err(msg)
     }
 
     #[allow(rustc::untranslatable_diagnostic)]
     #[allow(rustc::diagnostic_outside_of_impl)]
     pub fn early_fatal(&self, msg: impl Into<DiagnosticMessage>) -> ! {
-        self.dcx.struct_fatal(msg).emit()
+        self.dcx.fatal(msg)
     }
 
     #[allow(rustc::untranslatable_diagnostic)]
@@ -1481,7 +1481,7 @@ impl EarlyDiagCtxt {
     #[allow(rustc::untranslatable_diagnostic)]
     #[allow(rustc::diagnostic_outside_of_impl)]
     pub fn early_warn(&self, msg: impl Into<DiagnosticMessage>) {
-        self.dcx.struct_warn(msg).emit()
+        self.dcx.warn(msg)
     }
 
     pub fn initialize_checked_jobserver(&self) {

src/librustdoc/config.rs

@@ -421,7 +421,7 @@ impl Options {
             let paths = match theme::load_css_paths(content) {
                 Ok(p) => p,
                 Err(e) => {
-                    dcx.struct_err(e).emit();
+                    dcx.err(e);
                     return Err(1);
                 }
             };
@@ -452,10 +452,10 @@ impl Options {
         let input = PathBuf::from(if describe_lints {
             "" // dummy, this won't be used
         } else if matches.free.is_empty() {
-            dcx.struct_err("missing file operand").emit();
+            dcx.err("missing file operand");
             return Err(1);
         } else if matches.free.len() > 1 {
-            dcx.struct_err("too many file operands").emit();
+            dcx.err("too many file operands");
             return Err(1);
         } else {
             &matches.free[0]
@@ -467,7 +467,7 @@ impl Options {
         let extern_html_root_urls = match parse_extern_html_roots(matches) {
             Ok(ex) => ex,
             Err(err) => {
-                dcx.struct_err(err).emit();
+                dcx.err(err);
                 return Err(1);
             }
         };
@@ -534,7 +534,7 @@ impl Options {
         let output = matches.opt_str("output").map(|s| PathBuf::from(&s));
         let output = match (out_dir, output) {
             (Some(_), Some(_)) => {
-                dcx.struct_err("cannot use both 'out-dir' and 'output' at once").emit();
+                dcx.err("cannot use both 'out-dir' and 'output' at once");
                 return Err(1);
             }
             (Some(out_dir), None) => out_dir,
@@ -549,7 +549,7 @@ impl Options {
 
         if let Some(ref p) = extension_css {
             if !p.is_file() {
-                dcx.struct_err("option --extend-css argument must be a file").emit();
+                dcx.err("option --extend-css argument must be a file");
                 return Err(1);
             }
         }
@@ -567,7 +567,7 @@ impl Options {
             let paths = match theme::load_css_paths(content) {
                 Ok(p) => p,
                 Err(e) => {
-                    dcx.struct_err(e).emit();
+                    dcx.err(e);
                     return Err(1);
                 }
             };
@@ -589,7 +589,7 @@ impl Options {
                 }
                 let (success, ret) = theme::test_theme_against(&theme_file, &paths, &dcx);
                 if !success {
-                    dcx.struct_err(format!("error loading theme file: \"{theme_s}\"")).emit();
+                    dcx.err(format!("error loading theme file: \"{theme_s}\""));
                     return Err(1);
                 } else if !ret.is_empty() {
                     dcx.struct_warn(format!(
@@ -626,7 +626,7 @@ impl Options {
         match matches.opt_str("r").as_deref() {
             Some("rust") | None => {}
             Some(s) => {
-                dcx.struct_err(format!("unknown input format: {s}")).emit();
+                dcx.err(format!("unknown input format: {s}"));
                 return Err(1);
             }
         }
@@ -634,7 +634,7 @@ impl Options {
         let index_page = matches.opt_str("index-page").map(|s| PathBuf::from(&s));
         if let Some(ref index_page) = index_page {
             if !index_page.is_file() {
-                dcx.struct_err("option `--index-page` argument must be a file").emit();
+                dcx.err("option `--index-page` argument must be a file");
                 return Err(1);
             }
         }
@@ -646,7 +646,7 @@ impl Options {
         let crate_types = match parse_crate_types_from_list(matches.opt_strs("crate-type")) {
             Ok(types) => types,
             Err(e) => {
-                dcx.struct_err(format!("unknown crate type: {e}")).emit();
+                dcx.err(format!("unknown crate type: {e}"));
                 return Err(1);
             }
         };
@@ -664,7 +664,7 @@ impl Options {
                     out_fmt
                 }
                 Err(e) => {
-                    dcx.struct_err(e).emit();
+                    dcx.err(e);
                     return Err(1);
                 }
             },

src/librustdoc/externalfiles.rs

@@ -96,7 +96,7 @@ pub(crate) fn load_string<P: AsRef<Path>>(
     match str::from_utf8(&contents) {
         Ok(s) => Ok(s.to_string()),
         Err(_) => {
-            dcx.struct_err(format!("error reading `{}`: not UTF-8", file_path.display())).emit();
+            dcx.err(format!("error reading `{}`: not UTF-8", file_path.display()));
             Err(LoadStringError::BadUtf8)
         }
     }

src/librustdoc/html/render/context.rs

@@ -757,8 +757,7 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
 
         // Flush pending errors.
         Rc::get_mut(&mut self.shared).unwrap().fs.close();
-        let nb_errors =
+        let nb_errors = self.shared.errors.iter().map(|err| self.tcx().dcx().err(err)).count();
-            self.shared.errors.iter().map(|err| self.tcx().dcx().struct_err(err).emit()).count();
         if nb_errors > 0 {
             Err(Error::new(io::Error::new(io::ErrorKind::Other, "I/O error"), ""))
         } else {

src/librustdoc/lib.rs

@@ -676,10 +676,7 @@ type MainResult = Result<(), ErrorGuaranteed>;
 fn wrap_return(dcx: &rustc_errors::DiagCtxt, res: Result<(), String>) -> MainResult {
     match res {
         Ok(()) => dcx.has_errors().map_or(Ok(()), Err),
-        Err(err) => {
+        Err(err) => Err(dcx.err(err)),
-            let reported = dcx.struct_err(err).emit();
-            Err(reported)
-        }
     }
 }
 

src/librustdoc/theme.rs

@@ -244,7 +244,7 @@ pub(crate) fn test_theme_against<P: AsRef<Path>>(
     {
         Ok(c) => c,
         Err(e) => {
-            dcx.struct_err(e).emit();
+            dcx.err(e);
             return (false, vec![]);
         }
     };