diff --git a/test/ruby/test_symbol.rb b/test/ruby/test_symbol.rb
index 4461e51d61..4a7ca700c9 100644
--- a/test/ruby/test_symbol.rb
+++ b/test/ruby/test_symbol.rb
@@ -121,21 +121,24 @@ class TestSymbol < Test::Unit::TestCase
   end
 
   def test_to_proc_yield
-    assert_ruby_status([], <<-"end;", timeout: 5.0)
+    assert_ruby_status([], "#{<<-"begin;"}\n#{<<-"end;"}", timeout: 5.0)
+    begin;
       GC.stress = true
       true.tap(&:itself)
     end;
   end
 
   def test_to_proc_new_proc
-    assert_ruby_status([], <<-"end;", timeout: 5.0)
+    assert_ruby_status([], "#{<<-"begin;"}\n#{<<-"end;"}", timeout: 5.0)
+    begin;
       GC.stress = true
       2.times {Proc.new(&:itself)}
     end;
   end
 
   def test_to_proc_no_method
-    assert_separately([], <<-"end;", timeout: 5.0)
+    assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}", timeout: 5.0)
+    begin;
       bug11566 = '[ruby-core:70980] [Bug #11566]'
       assert_raise(NoMethodError, bug11566) {Proc.new(&:foo).(1)}
       assert_raise(NoMethodError, bug11566) {:foo.to_proc.(1)}
@@ -143,7 +146,8 @@ class TestSymbol < Test::Unit::TestCase
   end
 
   def test_to_proc_arg
-    assert_separately([], <<-"end;", timeout: 5.0)
+    assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}", timeout: 5.0)
+    begin;
       def (obj = Object.new).proc(&b) b; end
       assert_same(:itself.to_proc, obj.proc(&:itself))
     end;
@@ -168,13 +172,15 @@ class TestSymbol < Test::Unit::TestCase
 
   def test_to_proc_for_hash_each
     bug11830 = '[ruby-core:72205] [Bug #11830]'
-    assert_normal_exit(<<-'end;', bug11830) # do
+    assert_normal_exit("#{<<-"begin;"}\n#{<<-'end;'}", bug11830)
+    begin;
       {}.each(&:destroy)
     end;
   end
 
   def test_to_proc_iseq
-    assert_separately([], <<~"end;", timeout: 5) # do
+    assert_separately([], "#{<<-"begin;"}\n#{<<~"end;"}", timeout: 5)
+    begin;
       bug11845 = '[ruby-core:72381] [Bug #11845]'
       assert_nil(:class.to_proc.source_location, bug11845)
       assert_equal([[:rest]], :class.to_proc.parameters, bug11845)
@@ -186,7 +192,8 @@ class TestSymbol < Test::Unit::TestCase
   end
 
   def test_to_proc_binding
-    assert_separately([], <<~"end;", timeout: 5) # do
+    assert_separately([], "#{<<-"begin;"}\n#{<<~"end;"}", timeout: 5)
+    begin;
       bug12137 = '[ruby-core:74100] [Bug #12137]'
       assert_raise(ArgumentError, bug12137) {
         :succ.to_proc.binding
@@ -454,13 +461,15 @@ class TestSymbol < Test::Unit::TestCase
   def test_symbol_fstr_leak
     bug10686 = '[ruby-core:67268] [Bug #10686]'
     x = x = 0
-    assert_no_memory_leak([], '200_000.times { |i| i.to_s.to_sym }; GC.start', <<-"end;", bug10686, limit: 1.71, rss: true, timeout: 20)
+    assert_no_memory_leak([], '200_000.times { |i| i.to_s.to_sym }; GC.start', "#{<<-"begin;"}\n#{<<-"end;"}", bug10686, limit: 1.71, rss: true, timeout: 20)
+    begin;
       200_000.times { |i| (i + 200_000).to_s.to_sym }
     end;
   end
 
   def test_hash_redefinition
-    assert_separately([], <<-'end;')
+    assert_separately([], "#{<<-"begin;"}\n#{<<-'end;'}")
+    begin;
       bug11035 = '[ruby-core:68767] [Bug #11035]'
       class Symbol
         def hash