Rollup merge of #119601 - nnethercote:Emitter-cleanups, r=oli-obk

`Emitter` cleanups

Some improvements I found while looking at this code.

r? `@oli-obk`

2 files changed, 7 insertions, 16 deletions

diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index bff4f027a87..12d8293ecd2 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -2035,23 +2035,14 @@ fn check_error_format_stability(
     early_dcx: &mut EarlyDiagCtxt,
     unstable_opts: &UnstableOptions,
     error_format: ErrorOutputType,
-    json_rendered: HumanReadableErrorType,
 ) {
     if !unstable_opts.unstable_options {
-        if let ErrorOutputType::Json { pretty: true, json_rendered } = error_format {
-            early_dcx.abort_if_error_and_set_error_format(ErrorOutputType::Json {
-                pretty: false,
-                json_rendered,
-            });
+        if let ErrorOutputType::Json { pretty: true, .. } = error_format {
             early_dcx.early_fatal("`--error-format=pretty-json` is unstable");
         }
         if let ErrorOutputType::HumanReadable(HumanReadableErrorType::AnnotateSnippet(_)) =
             error_format
         {
-            early_dcx.abort_if_error_and_set_error_format(ErrorOutputType::Json {
-                pretty: false,
-                json_rendered,
-            });
             early_dcx.early_fatal("`--error-format=human-annotate-rs` is unstable");
         }
     }
@@ -2649,7 +2640,7 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
     let mut unstable_opts = UnstableOptions::build(early_dcx, matches);
     let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(early_dcx, matches);
 
-    check_error_format_stability(early_dcx, &unstable_opts, error_format, json_rendered);
+    check_error_format_stability(early_dcx, &unstable_opts, error_format);
 
     if !unstable_opts.unstable_options && json_unused_externs.is_enabled() {
         early_dcx.early_fatal(
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index c80990402a9..ce166ae352f 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -17,8 +17,8 @@ use rustc_data_structures::profiling::{SelfProfiler, SelfProfilerRef};
 use rustc_data_structures::sync::{
     AtomicU64, DynSend, DynSync, Lock, Lrc, OneThread, Ordering::SeqCst,
 };
-use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitterWriter;
-use rustc_errors::emitter::{DynEmitter, EmitterWriter, HumanReadableErrorType};
+use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitter;
+use rustc_errors::emitter::{DynEmitter, HumanEmitter, HumanReadableErrorType};
 use rustc_errors::json::JsonEmitter;
 use rustc_errors::registry::Registry;
 use rustc_errors::{
@@ -1000,7 +1000,7 @@ fn default_emitter(
             let (short, color_config) = kind.unzip();
 
             if let HumanReadableErrorType::AnnotateSnippet(_) = kind {
-                let emitter = AnnotateSnippetEmitterWriter::new(
+                let emitter = AnnotateSnippetEmitter::new(
                     Some(source_map),
                     bundle,
                     fallback_bundle,
@@ -1009,7 +1009,7 @@ fn default_emitter(
                 );
                 Box::new(emitter.ui_testing(sopts.unstable_opts.ui_testing))
             } else {
-                let emitter = EmitterWriter::stderr(color_config, fallback_bundle)
+                let emitter = HumanEmitter::stderr(color_config, fallback_bundle)
                     .fluent_bundle(bundle)
                     .sm(Some(source_map))
                     .short_message(short)
@@ -1504,7 +1504,7 @@ fn mk_emitter(output: ErrorOutputType) -> Box<DynEmitter> {
     let emitter: Box<DynEmitter> = match output {
         config::ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
-            Box::new(EmitterWriter::stderr(color_config, fallback_bundle).short_message(short))
+            Box::new(HumanEmitter::stderr(color_config, fallback_bundle).short_message(short))
         }
         config::ErrorOutputType::Json { pretty, json_rendered } => Box::new(JsonEmitter::basic(
             pretty,