fix time-passes collection

Author: Mark-Simulacrum

ci/check-profiling.sh

@@ -13,6 +13,8 @@ trap 'kill $PING_LOOP_PID' ERR 1 2 3 6
 RUST_BACKTRACE=1 RUST_LOG=raw_cargo_messages=trace,collector=debug,rust_sysroot=debug \
     bindir=`cargo run -p collector --bin collector install_next`
 
+cargo build -p collector --bin rustc-fake
+
 #----------------------------------------------------------------------------
 # Test the profilers
 #----------------------------------------------------------------------------

collector/src/rustc-fake.rs

@@ -145,8 +145,11 @@ fn main() {
 
             "time-passes" => {
                 args.insert(0, "-Ztime-passes".into());
-                let mut cmd = bash_command(tool, args, "> Ztp");
 
+                let mut cmd = Command::new(&tool);
+                cmd.args(args).stderr(std::process::Stdio::from(
+                    std::fs::File::create("Ztp").unwrap(),
+                ));
                 assert!(cmd.status().expect("failed to spawn").success());
             }