Let us run make btest

bootstraptest/runner.rb

@@ -720,4 +720,8 @@ def check_coredump
   end
 end
 
+def mmtk?
+  `#{BT.ruby} -e 'p defined?(GC::MMTk)'`.strip == '"constant"'
+end
+
 exit main

bootstraptest/test_ractor.rb

@@ -1,3 +1,5 @@
+return if mmtk?
+
 # Ractor.current returns a current ractor
 assert_equal 'Ractor', %q{
   Ractor.current.class

bootstraptest/test_thread.rb

@@ -1,3 +1,5 @@
+return if mmtk?
+
 show_limit %q{
   threads = []
   begin

bootstraptest/test_yjit.rb

@@ -1,3 +1,5 @@
+return if mmtk?
+
 assert_equal 'true', %q{
   # regression test for tracking type of locals for too long
   def local_setting_cmp(five)

bootstraptest/test_yjit_30k_ifelse.rb

@@ -1,3 +1,5 @@
+return if mmtk?
+
 # This is a torture test for the JIT.
 # There are 30K tiny methods with if-else statements in a 30-deep call hierarchy.
 assert_equal '100000', %q{

bootstraptest/test_yjit_30k_methods.rb

@@ -1,3 +1,5 @@
+return if mmtk?
+
 # This is a torture test for the JIT.
 # There are 30K tiny methods in a 30-deep call hierarchy.
 assert_equal '1000000', %q{

bootstraptest/test_yjit_rust_port.rb

@@ -1,3 +1,5 @@
+return if mmtk?
+
 # Simple tests that we know we can pass
 # To keep track of what we got working during the Rust port
 # And avoid breaking/losing functionality