test_all_ractors: ignore some more tests (pend)

Author: luke-gruber

test/ruby/test_optimization.rb

@@ -397,6 +397,7 @@ def self.tailcall(klass, src, file = nil, path = nil, line = nil, tailcall: true
   end
 
   def tailcall(*args)
+    pend "tailcall" if non_main_ractor?
     self.class.tailcall(singleton_class, *args)
   end
 

tool/lib/core_assertions.rb

@@ -274,6 +274,7 @@ def assert_valid_syntax(code, *args, **opt)
       end
 
       def assert_normal_exit(testsrc, message = '', child_env: nil, **opt)
+        pend "#{__method__}" if non_main_ractor?
         assert_valid_syntax(testsrc, caller_locations(1, 1)[0])
         if child_env
           child_env = [child_env]

tool/lib/envutil.rb

@@ -482,10 +482,12 @@ def self.gc_stress_to_class?
 
 if defined?(RbConfig)
   module RbConfig
-    @ruby = EnvUtil.rubybin
+    RUBY__ = EnvUtil.rubybin.freeze
     class << self
       undef ruby if method_defined?(:ruby)
-      attr_reader :ruby
+      def ruby
+        RUBY__
+      end
     end
     dir = File.dirname(ruby)
     CONFIG['bindir'] = dir