[ruby/irb] Use correct binding in debug mode

(https://github.com/ruby/irb/pull/1007)

In debug command, IRB's context was using wrong binding.
Some code colorization, command detection failed because binding.local_variable returned wrong value.

https://github.com/ruby/irb/commit/68f718de21

2 files changed, 18 insertions, 1 deletions

diff --git a/lib/irb/debug/ui.rb b/lib/irb/debug/ui.rb
index 307097b8c9..7a1cd6dd16 100644
--- a/lib/irb/debug/ui.rb
+++ b/lib/irb/debug/ui.rb
@@ -56,7 +56,7 @@ module IRB
       def readline _
         setup_interrupt do
           tc = DEBUGGER__::SESSION.instance_variable_get(:@tc)
-          cmd = @irb.debug_readline(tc.current_frame.binding || TOPLEVEL_BINDING)
+          cmd = @irb.debug_readline(tc.current_frame.eval_binding || TOPLEVEL_BINDING)
 
           case cmd
           when nil # when user types C-d
diff --git a/test/irb/test_debugger_integration.rb b/test/irb/test_debugger_integration.rb
index 8b1bddea17..45ffb2a52e 100644
--- a/test/irb/test_debugger_integration.rb
+++ b/test/irb/test_debugger_integration.rb
@@ -365,6 +365,23 @@ module TestIRB
       assert_include(output, "InputMethod: RelineInputMethod")
     end
 
+    def test_irb_command_can_check_local_variables
+      write_ruby <<~'ruby'
+        binding.irb
+      ruby
+
+      output = run_ruby_file do
+        type "debug"
+        type 'foobar = IRB'
+        type "show_source foobar.start"
+        type "show_source = 'Foo'"
+        type "show_source + 'Bar'"
+        type "continue"
+      end
+      assert_include(output, "def start(ap_path = nil)")
+      assert_include(output, '"FooBar"')
+    end
+
     def test_help_command_is_delegated_to_the_debugger
       write_ruby <<~'ruby'
         binding.irb