Report Rails load errors and continue generating

lib/tapioca/loaders/loader.rb

@@ -40,12 +40,17 @@ def load_rails_application(environment_load: false, eager_load: false)
         silence_deprecations
 
         if environment_load
-          safe_require("./config/environment")
+          require "./config/environment"
         else
-          safe_require("./config/application")
+          require "./config/application"
         end
 
         eager_load_rails_app if eager_load
+      rescue LoadError, StandardError => e
+        say("Tapioca attempted to load the Rails application after encountering a `config/application.rb` file, " \
+          "but it failed. If your application uses Rails please ensure it can be loaded correctly before generating " \
+          "RBIs.\n#{e}", :yellow)
+        say("Continuing RBI generation without loading the Rails application.")
       end
 
       sig { void }

spec/tapioca/cli/dsl_spec.rb

@@ -1273,6 +1273,35 @@ def saved_change_to_reviewer?; end
 
           assert_success_status(result)
         end
+
+        it "output errors when rails application cannot be loaded" do
+          @project.write("config/application.rb", <<~RB)
+            require "rails"
+
+            module Test
+              class Application < Rails::Application
+                raise "Error during application loading"
+              end
+            end
+          RB
+
+          @project.require_real_gem("rails")
+          @project.bundle_install
+          res = @project.tapioca("dsl")
+
+          out = "Tapioca attempted to load the Rails application after encountering a `config/application.rb` file, " \
+            "but it failed. If your application uses Rails please ensure it can be loaded correctly before " \
+            "generating RBIs."
+          assert_includes(res.out, out)
+          assert_includes(res.out, <<~OUT)
+            Error during application loading
+            Continuing RBI generation without loading the Rails application.
+            Done
+            Loading DSL compiler classes... Done
+            Compiling DSL RBI files...
+          OUT
+          assert_success_status(res)
+        end
       end
 
       describe "verify" do