bootstrap: print test name on failure even with `verbose-tests=false`

This makes it much easier to know which test failed without having to wait for compiletest to completely finish running. Before:
```
Testing stage0 compiletest suite=ui mode=ui (x86_64-unknown-linux-gnu)

running 15274 tests
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii    88/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   176/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   264/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   352/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   440/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   528/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiFFiiiiiii
...
```

After:
```
Testing stage0 compiletest suite=ui mode=ui (x86_64-unknown-linux-gnu)

running 15274 tests
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii    88/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   176/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   264/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   352/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   440/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii   528/15274
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
[ui] tests/ui/associated-type-bounds/implied-in-supertrait.rs ... F

[ui] tests/ui/associated-type-bounds/return-type-notation/basic.rs#next_with ... F
iiiiiiiiiiiii
...
```

This serves a similar use case to the existing RUSTC_TEST_FAIL_FAST, but is on by default and as a result much more discoverable.
We should consider unifying RUSTC_TEST_FAIL_FAST with the `--no-fail-fast` flag in the future for consistency and discoverability.

1 files changed, 7 insertions, 4 deletions

diff --git a/src/bootstrap/src/utils/render_tests.rs b/src/bootstrap/src/utils/render_tests.rs
index bfbb53f8c81..cbd01606a89 100644
--- a/src/bootstrap/src/utils/render_tests.rs
+++ b/src/bootstrap/src/utils/render_tests.rs
@@ -166,7 +166,7 @@ impl<'a> Renderer<'a> {
         println!();
     }
 
-    fn render_test_outcome_terse(&mut self, outcome: Outcome<'_>, _: &TestOutcome) {
+    fn render_test_outcome_terse(&mut self, outcome: Outcome<'_>, test: &TestOutcome) {
         if self.terse_tests_in_line != 0 && self.terse_tests_in_line % TERSE_TESTS_PER_LINE == 0 {
             if let Some(total) = self.tests_count {
                 let total = total.to_string();
@@ -178,7 +178,7 @@ impl<'a> Renderer<'a> {
         }
 
         self.terse_tests_in_line += 1;
-        self.builder.colored_stdout(|stdout| outcome.write_short(stdout)).unwrap();
+        self.builder.colored_stdout(|stdout| outcome.write_short(stdout, &test.name)).unwrap();
         let _ = std::io::stdout().flush();
     }
 
@@ -300,7 +300,7 @@ enum Outcome<'a> {
 }
 
 impl Outcome<'_> {
-    fn write_short(&self, writer: &mut dyn WriteColor) -> Result<(), std::io::Error> {
+    fn write_short(&self, writer: &mut dyn WriteColor, name: &str) -> Result<(), std::io::Error> {
         match self {
             Outcome::Ok => {
                 writer.set_color(ColorSpec::new().set_fg(Some(Color::Green)))?;
@@ -311,8 +311,11 @@ impl Outcome<'_> {
                 write!(writer, "b")?;
             }
             Outcome::Failed => {
+                // Put failed tests on their own line and include the test name, so that it's faster
+                // to see which test failed without having to wait for them all to run.
+                writeln!(writer)?;
                 writer.set_color(ColorSpec::new().set_fg(Some(Color::Red)))?;
-                write!(writer, "F")?;
+                writeln!(writer, "{name} ... F")?;
             }
             Outcome::Ignored { .. } => {
                 writer.set_color(ColorSpec::new().set_fg(Some(Color::Yellow)))?;