move and update test dependencies

Author: RalfJung

src/tools/miri/cargo-miri/src/util.rs

@@ -129,7 +129,8 @@ pub fn exec(mut cmd: Command) -> ! {
     // On non-Unix imitate POSIX exec as closely as we can
     #[cfg(not(unix))]
     {
-        let exit_status = cmd.status().expect("failed to run command");
+        let exit_status =
+            cmd.status().unwrap_or_else(|err| panic!("failed to run `{cmd:?}`:\n{err}"));
         std::process::exit(exit_status.code().unwrap_or(-1))
     }
     // On Unix targets, actually exec.
@@ -138,8 +139,8 @@ pub fn exec(mut cmd: Command) -> ! {
     #[cfg(unix)]
     {
         use std::os::unix::process::CommandExt;
-        let error = cmd.exec();
-        panic!("failed to run command: {error}")
+        let err = cmd.exec();
+        panic!("failed to run `{cmd:?}`:\n{err}")
     }
 }
 

src/tools/miri/miri-script/src/main.rs

@@ -75,7 +75,7 @@ pub enum Command {
     ///
     /// Also respects MIRIFLAGS environment variable.
     Run {
-        /// Build the program with the dependencies declared in `test_dependencies/Cargo.toml`.
+        /// Build the program with the dependencies declared in `tests/deps/Cargo.toml`.
         #[arg(long)]
         dep: bool,
         /// Show build progress.