Make --quiet actually do something

src/tools/miri/Cargo.lock

@@ -842,9 +842,9 @@ dependencies = [
 
 [[package]]
 name = "ui_test"
-version = "0.11.0"
+version = "0.11.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b75049e51d3db204b2de79c8ff7a8675c628d81ceef6ec97598c1ab7d4d66802"
+checksum = "24a2e70adc9d18b9b4dd80ea57aeec447103c6fbb354a07c080adad451c645e1"
 dependencies = [
  "bstr",
  "cargo-platform",

src/tools/miri/Cargo.toml

@@ -36,7 +36,7 @@ libloading = "0.7"
 
 [dev-dependencies]
 colored = "2"
-ui_test = "0.11"
+ui_test = "0.11.6"
 rustc_version = "0.4"
 # Features chosen to match those required by env_logger, to avoid rebuilds
 regex = { version = "1.5.5", default-features = false, features = ["perf", "std"] }

src/tools/miri/tests/compiletest.rs

@@ -3,8 +3,8 @@
 use std::ffi::OsString;
 use std::path::{Path, PathBuf};
 use std::{env, process::Command};
-use ui_test::CommandBuilder;
 use ui_test::{color_eyre::Result, Config, Match, Mode, OutputConflictHandling};
+use ui_test::{status_emitter, CommandBuilder};
 
 fn miri_path() -> PathBuf {
     PathBuf::from(option_env!("MIRI").unwrap_or(env!("CARGO_BIN_EXE_miri")))
@@ -149,8 +149,15 @@ fn run_tests(mode: Mode, path: &str, target: &str, with_dependencies: bool) -> R
         // This could be used to overwrite the `Config` on a per-test basis.
         |_, _| None,
         (
-            ui_test::status_emitter::Text,
-            ui_test::status_emitter::Gha::<false> { name: format!("{mode:?} {path} ({target})") },
+            if quiet {
+                Box::<status_emitter::Quiet>::default()
+                    as Box<dyn status_emitter::StatusEmitter + Send>
+            } else {
+                Box::new(status_emitter::Text)
+            },
+            status_emitter::Gha::</* GHA Actions groups*/ false> {
+                name: format!("{mode:?} {path} ({target})"),
+            },
         ),
     )
 }