compiletest: print{,ln}! -> eprint{,ln}!

Co-authored-by: Jieyou Xu <jieyouxu@outlook.com>

src/tools/compiletest/src/compute_diff.rs

@@ -144,7 +144,7 @@ where
     }
 
     if !wrote_data {
-        println!("note: diff is identical to nightly rustdoc");
+        eprintln!("note: diff is identical to nightly rustdoc");
         assert!(diff_output.metadata().unwrap().len() == 0);
         return false;
     } else if verbose {

src/tools/compiletest/src/debuggers.rs

@@ -20,15 +20,15 @@ pub(crate) fn configure_gdb(config: &Config) -> Option<Arc<Config>> {
     }
 
     if config.remote_test_client.is_some() && !config.target.contains("android") {
-        println!(
+        eprintln!(
             "WARNING: debuginfo tests are not available when \
              testing with remote"
         );
         return None;
     }
 
     if config.target.contains("android") {
-        println!(
+        eprintln!(
             "{} debug-info test uses tcp 5039 port.\
              please reserve it",
             config.target
@@ -50,7 +50,7 @@ pub(crate) fn configure_lldb(config: &Config) -> Option<Arc<Config>> {
     config.lldb_python_dir.as_ref()?;
 
     if let Some(350) = config.lldb_version {
-        println!(
+        eprintln!(
             "WARNING: The used version of LLDB (350) has a \
              known issue that breaks debuginfo tests. See \
              issue #32520 for more information. Skipping all \

src/tools/compiletest/src/lib.rs

@@ -188,8 +188,8 @@ pub fn parse_config(args: Vec<String>) -> Config {
     let (argv0, args_) = args.split_first().unwrap();
     if args.len() == 1 || args[1] == "-h" || args[1] == "--help" {
         let message = format!("Usage: {} [OPTIONS] [TESTNAME...]", argv0);
-        println!("{}", opts.usage(&message));
-        println!();
+        eprintln!("{}", opts.usage(&message));
+        eprintln!();
         panic!()
     }
 
@@ -200,8 +200,8 @@ pub fn parse_config(args: Vec<String>) -> Config {
 
     if matches.opt_present("h") || matches.opt_present("help") {
         let message = format!("Usage: {} [OPTIONS]  [TESTNAME...]", argv0);
-        println!("{}", opts.usage(&message));
-        println!();
+        eprintln!("{}", opts.usage(&message));
+        eprintln!();
         panic!()
     }
 
@@ -508,7 +508,7 @@ pub fn run_tests(config: Arc<Config>) {
             // easy to miss which tests failed, and as such fail to reproduce
             // the failure locally.
 
-            println!(
+            eprintln!(
                 "Some tests failed in compiletest suite={}{} mode={} host={} target={}",
                 config.suite,
                 config

src/tools/compiletest/src/runtest.rs

@@ -131,7 +131,7 @@ pub fn run(config: Arc<Config>, testpaths: &TestPaths, revision: Option<&str>) {
 
     if config.verbose {
         // We're going to be dumping a lot of info. Start on a new line.
-        print!("\n\n");
+        eprintln!("\n");
     }
     debug!("running {:?}", testpaths.file.display());
     let mut props = TestProps::from_file(&testpaths.file, revision, &config);
@@ -353,7 +353,7 @@ impl<'test> TestCx<'test> {
                 {
                     self.error(&format!("{} test did not emit an error", self.config.mode));
                     if self.config.mode == crate::common::Mode::Ui {
-                        println!("note: by default, ui tests are expected not to compile");
+                        eprintln!("note: by default, ui tests are expected not to compile");
                     }
                     proc_res.fatal(None, || ());
                 };
@@ -774,20 +774,20 @@ impl<'test> TestCx<'test> {
                 unexpected.len(),
                 not_found.len()
             ));
-            println!("status: {}\ncommand: {}\n", proc_res.status, proc_res.cmdline);
+            eprintln!("status: {}\ncommand: {}\n", proc_res.status, proc_res.cmdline);
             if !unexpected.is_empty() {
-                println!("{}", "--- unexpected errors (from JSON output) ---".green());
+                eprintln!("{}", "--- unexpected errors (from JSON output) ---".green());
                 for error in &unexpected {
-                    println!("{}", error.render_for_expected());
+                    eprintln!("{}", error.render_for_expected());
                 }
-                println!("{}", "---".green());
+                eprintln!("{}", "---".green());
             }
             if !not_found.is_empty() {
-                println!("{}", "--- not found errors (from test file) ---".red());
+                eprintln!("{}", "--- not found errors (from test file) ---".red());
                 for error in &not_found {
-                    println!("{}", error.render_for_expected());
+                    eprintln!("{}", error.render_for_expected());
                 }
-                println!("{}", "---\n".red());
+                eprintln!("{}", "---\n".red());
             }
             panic!("errors differ from expected");
         }
@@ -1876,18 +1876,18 @@ impl<'test> TestCx<'test> {
 
     fn maybe_dump_to_stdout(&self, out: &str, err: &str) {
         if self.config.verbose {
-            println!("------stdout------------------------------");
-            println!("{}", out);
-            println!("------stderr------------------------------");
-            println!("{}", err);
-            println!("------------------------------------------");
+            eprintln!("------stdout------------------------------");
+            eprintln!("{}", out);
+            eprintln!("------stderr------------------------------");
+            eprintln!("{}", err);
+            eprintln!("------------------------------------------");
         }
     }
 
     fn error(&self, err: &str) {
         match self.revision {
-            Some(rev) => println!("\nerror in revision `{}`: {}", rev, err),
-            None => println!("\nerror: {}", err),
+            Some(rev) => eprintln!("\nerror in revision `{}`: {}", rev, err),
+            None => eprintln!("\nerror: {}", err),
         }
     }
 
@@ -1972,7 +1972,7 @@ impl<'test> TestCx<'test> {
         if !self.config.has_html_tidy {
             return;
         }
-        println!("info: generating a diff against nightly rustdoc");
+        eprintln!("info: generating a diff against nightly rustdoc");
 
         let suffix =
             self.safe_revision().map_or("nightly".into(), |path| path.to_owned() + "-nightly");
@@ -2082,7 +2082,7 @@ impl<'test> TestCx<'test> {
                 .output()
                 .unwrap();
             assert!(output.status.success());
-            println!("{}", String::from_utf8_lossy(&output.stdout));
+            eprintln!("{}", String::from_utf8_lossy(&output.stdout));
             eprintln!("{}", String::from_utf8_lossy(&output.stderr));
         } else {
             use colored::Colorize;
@@ -2496,7 +2496,7 @@ impl<'test> TestCx<'test> {
                 )"#
             )
             .replace_all(&output, |caps: &Captures<'_>| {
-                println!("{}", &caps[0]);
+                eprintln!("{}", &caps[0]);
                 caps[0].replace(r"\", "/")
             })
             .replace("\r\n", "\n")
@@ -2601,14 +2601,14 @@ impl<'test> TestCx<'test> {
         if let Err(err) = fs::write(&actual_path, &actual) {
             self.fatal(&format!("failed to write {stream} to `{actual_path:?}`: {err}",));
         }
-        println!("Saved the actual {stream} to {actual_path:?}");
+        eprintln!("Saved the actual {stream} to {actual_path:?}");
 
         let expected_path =
             expected_output_path(self.testpaths, self.revision, &self.config.compare_mode, stream);
 
         if !self.config.bless {
             if expected.is_empty() {
-                println!("normalized {}:\n{}\n", stream, actual);
+                eprintln!("normalized {}:\n{}\n", stream, actual);
             } else {
                 self.show_diff(
                     stream,
@@ -2631,10 +2631,10 @@ impl<'test> TestCx<'test> {
             if let Err(err) = fs::write(&expected_path, &actual) {
                 self.fatal(&format!("failed to write {stream} to `{expected_path:?}`: {err}"));
             }
-            println!("Blessing the {stream} of {test_name} in {expected_path:?}");
+            eprintln!("Blessing the {stream} of {test_name} in {expected_path:?}");
         }
 
-        println!("\nThe actual {0} differed from the expected {0}.", stream);
+        eprintln!("\nThe actual {0} differed from the expected {0}.", stream);
 
         if self.config.bless { 0 } else { 1 }
     }
@@ -2783,7 +2783,7 @@ impl<'test> TestCx<'test> {
         fs::create_dir_all(&incremental_dir).unwrap();
 
         if self.config.verbose {
-            println!("init_incremental_test: incremental_dir={}", incremental_dir.display());
+            eprintln!("init_incremental_test: incremental_dir={}", incremental_dir.display());
         }
     }
 
@@ -2841,7 +2841,7 @@ impl ProcRes {
             }
         }
 
-        println!(
+        eprintln!(
             "status: {}\ncommand: {}\n{}\n{}\n",
             self.status,
             self.cmdline,
@@ -2852,7 +2852,7 @@ impl ProcRes {
 
     pub fn fatal(&self, err: Option<&str>, on_failure: impl FnOnce()) -> ! {
         if let Some(e) = err {
-            println!("\nerror: {}", e);
+            eprintln!("\nerror: {}", e);
         }
         self.print_info();
         on_failure();

src/tools/compiletest/src/runtest/codegen_units.rs

@@ -64,13 +64,13 @@ impl TestCx<'_> {
         if !missing.is_empty() {
             missing.sort();
 
-            println!("\nThese items should have been contained but were not:\n");
+            eprintln!("\nThese items should have been contained but were not:\n");
 
             for item in &missing {
-                println!("{}", item);
+                eprintln!("{}", item);
             }
 
-            println!("\n");
+            eprintln!("\n");
         }
 
         if !unexpected.is_empty() {
@@ -80,24 +80,24 @@ impl TestCx<'_> {
                 sorted
             };
 
-            println!("\nThese items were contained but should not have been:\n");
+            eprintln!("\nThese items were contained but should not have been:\n");
 
             for item in sorted {
-                println!("{}", item);
+                eprintln!("{}", item);
             }
 
-            println!("\n");
+            eprintln!("\n");
         }
 
         if !wrong_cgus.is_empty() {
             wrong_cgus.sort_by_key(|pair| pair.0.name.clone());
-            println!("\nThe following items were assigned to wrong codegen units:\n");
+            eprintln!("\nThe following items were assigned to wrong codegen units:\n");
 
             for &(ref expected_item, ref actual_item) in &wrong_cgus {
-                println!("{}", expected_item.name);
-                println!("  expected: {}", codegen_units_to_str(&expected_item.codegen_units));
-                println!("  actual:   {}", codegen_units_to_str(&actual_item.codegen_units));
-                println!();
+                eprintln!("{}", expected_item.name);
+                eprintln!("  expected: {}", codegen_units_to_str(&expected_item.codegen_units));
+                eprintln!("  actual:   {}", codegen_units_to_str(&actual_item.codegen_units));
+                eprintln!();
             }
         }
 

src/tools/compiletest/src/runtest/debuginfo.rs

@@ -260,7 +260,7 @@ impl TestCx<'_> {
                 cmdline,
             };
             if adb.kill().is_err() {
-                println!("Adb process is already finished.");
+                eprintln!("Adb process is already finished.");
             }
         } else {
             let rust_src_root =
@@ -275,7 +275,7 @@ impl TestCx<'_> {
 
             match self.config.gdb_version {
                 Some(version) => {
-                    println!("NOTE: compiletest thinks it is using GDB version {}", version);
+                    eprintln!("NOTE: compiletest thinks it is using GDB version {}", version);
 
                     if version > extract_gdb_version("7.4").unwrap() {
                         // Add the directory containing the pretty printers to
@@ -297,7 +297,7 @@ impl TestCx<'_> {
                     }
                 }
                 _ => {
-                    println!(
+                    eprintln!(
                         "NOTE: compiletest does not know which version of \
                          GDB it is using"
                     );
@@ -392,10 +392,10 @@ impl TestCx<'_> {
 
         match self.config.lldb_version {
             Some(ref version) => {
-                println!("NOTE: compiletest thinks it is using LLDB version {}", version);
+                eprintln!("NOTE: compiletest thinks it is using LLDB version {}", version);
             }
             _ => {
-                println!(
+                eprintln!(
                     "NOTE: compiletest does not know which version of \
                      LLDB it is using"
                 );

src/tools/compiletest/src/runtest/incremental.rs

@@ -30,7 +30,7 @@ impl TestCx<'_> {
         assert!(incremental_dir.exists(), "init_incremental_test failed to create incremental dir");
 
         if self.config.verbose {
-            print!("revision={:?} props={:#?}", revision, self.props);
+            eprint!("revision={:?} props={:#?}", revision, self.props);
         }
 
         if revision.starts_with("cpass") {

src/tools/compiletest/src/runtest/mir_opt.rs

@@ -89,7 +89,7 @@ impl TestCx<'_> {
                 }
                 let expected_string = fs::read_to_string(&expected_file).unwrap();
                 if dumped_string != expected_string {
-                    print!("{}", write_diff(&expected_string, &dumped_string, 3));
+                    eprint!("{}", write_diff(&expected_string, &dumped_string, 3));
                     panic!(
                         "Actual MIR output differs from expected MIR output {}",
                         expected_file.display()

src/tools/compiletest/src/runtest/rustdoc_json.rs

@@ -29,7 +29,7 @@ impl TestCx<'_> {
 
         if !res.status.success() {
             self.fatal_proc_rec_with_ctx("jsondocck failed!", &res, |_| {
-                println!("Rustdoc Output:");
+                eprintln!("Rustdoc Output:");
                 proc_res.print_info();
             })
         }

src/tools/compiletest/src/runtest/ui.rs

@@ -109,10 +109,10 @@ impl TestCx<'_> {
         }
 
         if errors > 0 {
-            println!("To update references, rerun the tests and pass the `--bless` flag");
+            eprintln!("To update references, rerun the tests and pass the `--bless` flag");
             let relative_path_to_file =
                 self.testpaths.relative_dir.join(self.testpaths.file.file_name().unwrap());
-            println!(
+            eprintln!(
                 "To only update this specific test, also pass `--test-args {}`",
                 relative_path_to_file.display(),
             );

src/tools/compiletest/src/util.rs

@@ -30,7 +30,7 @@ fn path_div() -> &'static str {
 pub fn logv(config: &Config, s: String) {
     debug!("{}", s);
     if config.verbose {
-        println!("{}", s);
+        eprintln!("{}", s);
     }
 }