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-rw-r--r--src/bootstrap/src/core/build_steps/test.rs6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 0dd3d0b3bd1..e25b571acba 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -1697,7 +1697,11 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
         builder.ensure(TestHelpers { target: compiler.host });
 
         // ensure that `libproc_macro` is available on the host.
-        builder.ensure(compile::Std::new(compiler, compiler.host));
+        if suite == "mir-opt" {
+            builder.ensure(compile::Std::new_for_mir_opt_tests(compiler, compiler.host));
+        } else {
+            builder.ensure(compile::Std::new(compiler, compiler.host));
+        }
 
         // As well as the target
         if suite != "mir-opt" {