diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
index 3bb8220d8282f1..c53be6f410c5d1 100644
--- a/.github/workflows/compilers.yml
+++ b/.github/workflows/compilers.yml
@@ -296,9 +296,6 @@ jobs:
       - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
       - { uses: './.github/actions/compilers', name: 'VM_DEBUG_BP_CHECK',              with: { cppflags: '-DVM_DEBUG_BP_CHECK' } }
       - { uses: './.github/actions/compilers', name: 'VM_DEBUG_VERIFY_METHOD_CACHE',   with: { cppflags: '-DVM_DEBUG_VERIFY_METHOD_CACHE' } }
-      - { uses: './.github/actions/compilers', name: 'enable-yjit',                    with: { append_configure: '--enable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'enable-{y,z}jit',                with: { append_configure: '--enable-yjit --enable-zjit' } }
-      - { uses: './.github/actions/compilers', name: 'enable-{y,z}jit=dev',            with: { append_configure: '--enable-yjit=dev --enable-zjit' } }
       - { uses: './.github/actions/compilers', name: 'YJIT_FORCE_ENABLE',              with: { cppflags: '-DYJIT_FORCE_ENABLE' } }
       - { uses: './.github/actions/compilers', name: 'UNIVERSAL_PARSER',               with: { cppflags: '-DUNIVERSAL_PARSER' } }
 
diff --git a/ext/date/date_core.c b/ext/date/date_core.c
index dbee067f6baa8e..457838e41f8d55 100644
--- a/ext/date/date_core.c
+++ b/ext/date/date_core.c
@@ -3974,7 +3974,7 @@ rt_complete_frags(VALUE klass, VALUE hash)
 	rb_gc_register_mark_object(tab);
     }
 
-    k = Qnil;
+    k = a = Qnil;
 
     {
 	long i, eno = 0;
diff --git a/include/ruby/internal/core/robject.h b/include/ruby/internal/core/robject.h
index 4892faab2b1adf..99f6470ac15c81 100644
--- a/include/ruby/internal/core/robject.h
+++ b/include/ruby/internal/core/robject.h
@@ -55,7 +55,7 @@
  */
 enum ruby_robject_flags {
     /**
-     * This flag has marks that the object's instance variables are stored in an
+     * This flag marks that the object's instance variables are stored in an
      * external heap buffer.
      * Normally, instance variable references are stored inside the object slot,
      * but if it overflow, Ruby may have to allocate a separate buffer and spills
diff --git a/lib/prism/polyfill/warn.rb b/lib/prism/polyfill/warn.rb
index 560380d30807e8..76a4264623ba21 100644
--- a/lib/prism/polyfill/warn.rb
+++ b/lib/prism/polyfill/warn.rb
@@ -7,17 +7,14 @@
   Kernel.prepend(
     Module.new {
       def warn(*msgs, uplevel: nil, category: nil) # :nodoc:
-        uplevel =
-          case uplevel
-          when nil
-            1
-          when Integer
-            uplevel + 1
-          else
-            uplevel.to_int + 1
-          end
-
-        super(*msgs, uplevel: uplevel)
+        case uplevel
+        when nil
+          super(*msgs)
+        when Integer
+          super(*msgs, uplevel: uplevel + 1)
+        else
+          super(*msgs, uplevel: uplevel.to_int + 1)
+        end
       end
     }
   )
@@ -25,17 +22,14 @@ def warn(*msgs, uplevel: nil, category: nil) # :nodoc:
   Object.prepend(
     Module.new {
       def warn(*msgs, uplevel: nil, category: nil) # :nodoc:
-        uplevel =
-          case uplevel
-          when nil
-            1
-          when Integer
-            uplevel + 1
-          else
-            uplevel.to_int + 1
-          end
-
-        super(*msgs, uplevel: uplevel)
+        case uplevel
+        when nil
+          super(*msgs)
+        when Integer
+          super(*msgs, uplevel: uplevel + 1)
+        else
+          super(*msgs, uplevel: uplevel.to_int + 1)
+        end
       end
     }
   )
diff --git a/pathname_builtin.rb b/pathname_builtin.rb
index 52b7003a64b8bf..16ed219ec38c06 100644
--- a/pathname_builtin.rb
+++ b/pathname_builtin.rb
@@ -321,7 +321,7 @@ def sub_ext(repl)
   end
 
   if File.dirname('A:') == 'A:.' # DOSish drive letter
-    # Regexp that matches an absoltute path.
+    # Regexp that matches an absolute path.
     ABSOLUTE_PATH = /\A(?:[A-Za-z]:|#{SEPARATOR_PAT})/
   else
     ABSOLUTE_PATH = /\A#{SEPARATOR_PAT}/
diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index 9074e54df5ed50..cccd7359e1108e 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -280,6 +280,12 @@ def test_methods_prepend_singleton
     assert_equal([:foo], k.private_methods(false))
   end
 
+  class ToStrCounter
+    def initialize(str = "@foo") @str = str; @count = 0; end
+    def to_str; @count += 1; @str; end
+    def count; @count; end
+  end
+
   def test_instance_variable_get
     o = Object.new
     o.instance_eval { @foo = :foo }
@@ -291,9 +297,7 @@ def test_instance_variable_get
     assert_raise(NameError) { o.instance_variable_get("bar") }
     assert_raise(TypeError) { o.instance_variable_get(1) }
 
-    n = Object.new
-    def n.to_str; @count = defined?(@count) ? @count + 1 : 1; "@foo"; end
-    def n.count; @count; end
+    n = ToStrCounter.new
     assert_equal(:foo, o.instance_variable_get(n))
     assert_equal(1, n.count)
   end
@@ -308,9 +312,7 @@ def test_instance_variable_set
     assert_raise(NameError) { o.instance_variable_set("bar", 1) }
     assert_raise(TypeError) { o.instance_variable_set(1, 1) }
 
-    n = Object.new
-    def n.to_str; @count = defined?(@count) ? @count + 1 : 1; "@foo"; end
-    def n.count; @count; end
+    n = ToStrCounter.new
     o.instance_variable_set(n, :bar)
     assert_equal(:bar, o.instance_eval { @foo })
     assert_equal(1, n.count)
@@ -327,9 +329,7 @@ def test_instance_variable_defined
     assert_raise(NameError) { o.instance_variable_defined?("bar") }
     assert_raise(TypeError) { o.instance_variable_defined?(1) }
 
-    n = Object.new
-    def n.to_str; @count = defined?(@count) ? @count + 1 : 1; "@foo"; end
-    def n.count; @count; end
+    n = ToStrCounter.new
     assert_equal(true, o.instance_variable_defined?(n))
     assert_equal(1, n.count)
   end