Remove DontDistWithMiri struct and instead just directly check it in builder

src/bootstrap/builder.rs

@@ -286,8 +286,7 @@ impl<'a> Builder<'a> {
                 doc::Reference, doc::Rustdoc, doc::RustByExample, doc::CargoBook),
             Kind::Dist => describe!(dist::Docs, dist::Mingw, dist::Rustc, dist::DebuggerScripts,
                 dist::Std, dist::Analysis, dist::Src, dist::PlainSourceTarball, dist::Cargo,
-                dist::Rls, dist::Rustfmt, dist::Extended, dist::HashSign,
+                dist::Rls, dist::Rustfmt, dist::Extended, dist::HashSign),
-                dist::DontDistWithMiriEnabled),
             Kind::Install => describe!(install::Docs, install::Std, install::Cargo, install::Rls,
                 install::Rustfmt, install::Analysis, install::Src, install::Rustc),
         }
@@ -344,6 +343,12 @@ impl<'a> Builder<'a> {
             stack: RefCell::new(Vec::new()),
         };
 
+        if kind == Kind::Dist {
+            assert!(!build.config.test_miri, "Do not distribute with miri enabled.\n\
+                The distributed libraries would include all MIR (increasing binary size).
+                The distributed MIR would include validation statements.");
+        }
+
         StepDescription::run(&Builder::get_step_descriptions(builder.kind), &builder, paths);
     }
 

src/bootstrap/dist.rs

@@ -1233,31 +1233,6 @@ impl Step for Rustfmt {
     }
 }
 
-
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
-pub struct DontDistWithMiriEnabled;
-
-impl Step for DontDistWithMiriEnabled {
-    type Output = PathBuf;
-    const DEFAULT: bool = true;
-
-    fn should_run(run: ShouldRun) -> ShouldRun {
-        let build_miri = run.builder.build.config.test_miri;
-        run.default_condition(build_miri)
-    }
-
-    fn make_run(run: RunConfig) {
-        run.builder.ensure(DontDistWithMiriEnabled);
-    }
-
-    fn run(self, _: &Builder) -> PathBuf {
-        panic!("Do not distribute with miri enabled.\n\
-                The distributed libraries would include all MIR (increasing binary size).
-                The distributed MIR would include validation statements.");
-    }
-}
-
-
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Extended {
     stage: u32,