Check if RubyVM is defined before accessing it

ruby · Dec 5, 2023 · f1042b7 · f1042b7
1 parent 685caf1
commit f1042b7
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/lib/debug/session.rb b/lib/debug/session.rb
@@ -82,7 +82,7 @@ def last_line
   def first_line
     self.to_a[4][:code_location][0]
   end unless method_defined?(:first_line)
-end
+end if defined?(RubyVM::InstructionSequence)
 
 module DEBUGGER__
   PresetCommands = Struct.new(:commands, :source, :auto_continue)
@@ -133,7 +133,7 @@ def initialize
       @commands = {}
       @unsafe_context = false
 
-      @has_keep_script_lines = RubyVM.respond_to? :keep_script_lines
+      @has_keep_script_lines = defined?(RubyVM.keep_script_lines)
 
       @tp_load_script = TracePoint.new(:script_compiled){|tp|
         eval_script = tp.eval_script unless @has_keep_script_lines

diff --git a/lib/debug/source_repository.rb b/lib/debug/source_repository.rb
@@ -22,7 +22,7 @@ def get iseq
       end
     end
 
-    if RubyVM.respond_to? :keep_script_lines
+    if defined?(RubyVM.keep_script_lines)
       # Ruby 3.1 and later
       RubyVM.keep_script_lines = true
       require 'objspace'