Fix bundle console unnecessarily trying to load IRB twice

bundler/lib/bundler/cli/console.rb

@@ -20,9 +20,14 @@ def get_console(name)
       require name
       get_constant(name)
     rescue LoadError
-      Bundler.ui.error "Couldn't load console #{name}, falling back to irb"
-      require "irb"
-      get_constant("irb")
+      if name == "irb"
+        Bundler.ui.error "#{name} is not available"
+        exit 1
+      else
+        Bundler.ui.error "Couldn't load console #{name}, falling back to irb"
+        name = "irb"
+        retry
+      end
     end
 
     def get_constant(name)
@@ -32,9 +37,6 @@ def get_constant(name)
         "irb" => :IRB,
       }[name]
       Object.const_get(const_name)
-    rescue NameError
-      Bundler.ui.error "Could not find constant #{const_name}"
-      exit 1
     end
   end
 end

bundler/spec/commands/console_spec.rb

@@ -113,6 +113,17 @@ def __pry__
       expect(out).to include("(irb)")
     end
 
+    it "does not try IRB twice if no console is configured and IRB is not available" do
+      create_file("irb.rb", "raise LoadError, 'irb is not available'")
+
+      bundle("console", env: { "RUBYOPT" => "-I#{bundled_app} #{ENV["RUBYOPT"]}" }, raise_on_error: false) do |input, _, _|
+        input.puts("puts ACTIVESUPPORT")
+        input.puts("exit")
+      end
+      expect(err).not_to include("falling back to irb")
+      expect(err).to include("irb is not available")
+    end
+
     it "doesn't load any other groups" do
       bundle "console" do |input, _, _|
         input.puts("puts ACTIVESUPPORT")