Pass args after -- to subcommands

src/bootstrap/config.rs

@@ -868,6 +868,7 @@ impl Config {
 
         // Set flags.
         config.paths = std::mem::take(&mut flags.paths);
+        config.free_args = std::mem::take(&mut flags.free_args);
         config.exclude = flags.exclude.into_iter().map(|path| TaskPath::parse(path)).collect();
         config.include_default_paths = flags.include_default_paths;
         config.rustc_error_format = flags.error_format;

src/bootstrap/flags.rs

@@ -459,8 +459,7 @@ impl Subcommand {
         }
     }
 
-    pub fn only_modified(
-        &self) -> bool {
+    pub fn only_modified(&self) -> bool {
         match *self {
             Subcommand::Test { only_modified, .. } => only_modified,
             _ => false,

src/bootstrap/run.rs

@@ -184,7 +184,6 @@ impl Step for Miri {
         miri.arg("--").arg("--target").arg(target.rustc_target_arg());
         miri.args(builder.config.cmd.args());
         miri.args(&builder.config.free_args);
-
         // miri tests need to know about the stage sysroot
         miri.env("MIRI_SYSROOT", &miri_sysroot);