From 7b0a1569654cc2798a737411fefdbfab9979324f Mon Sep 17 00:00:00 2001
From: Alexander Bulancov <6594487+trinistr@users.noreply.github.com>
Date: Sat, 15 Nov 2025 00:46:02 +0300
Subject: [PATCH] Protect mkspec against accessing SortedSet without the gem

---
 lib/mspec/utils/name_map.rb             | 13 ++++++++++---
 spec/utils/fixtures/this_file_raises.rb |  1 +
 spec/utils/name_map_spec.rb             |  7 +++++++
 3 files changed, 18 insertions(+), 3 deletions(-)
 create mode 100644 spec/utils/fixtures/this_file_raises.rb

diff --git a/lib/mspec/utils/name_map.rb b/lib/mspec/utils/name_map.rb
index bf70e65..9b04112 100644
--- a/lib/mspec/utils/name_map.rb
+++ b/lib/mspec/utils/name_map.rb
@@ -66,10 +66,17 @@ def exception?(name)
   end
 
   def class_or_module(c)
-    const = Object.const_get(c, false)
+    begin
+      const = Object.const_get(c, false)
+    rescue NameError, RuntimeError
+      # Either the constant doesn't exist or it is
+      # explicitly raising an error, like `SortedSet`.
+      return nil
+    end
+    return nil unless Module === const
+
     filtered = @filter && EXCLUDED.include?(const.name)
-    return const if Module === const and !filtered
-  rescue NameError
+    return const unless filtered
   end
 
   def namespace(mod, const)
diff --git a/spec/utils/fixtures/this_file_raises.rb b/spec/utils/fixtures/this_file_raises.rb
new file mode 100644
index 0000000..8e37a58
--- /dev/null
+++ b/spec/utils/fixtures/this_file_raises.rb
@@ -0,0 +1 @@
+raise "This is a BAD file"
diff --git a/spec/utils/name_map_spec.rb b/spec/utils/name_map_spec.rb
index a18a481..23bf95d 100644
--- a/spec/utils/name_map_spec.rb
+++ b/spec/utils/name_map_spec.rb
@@ -21,6 +21,8 @@ class Fixnum
     def f; end
   end
 
+  autoload :BadFile, "#{__dir__}/fixtures/this_file_raises.rb"
+
   def self.n; end
   def n; end
 end
@@ -84,6 +86,11 @@ def n; end
     expect(@map.class_or_module("Hell")).to eq(nil)
     expect(@map.class_or_module("Bush::Brain")).to eq(nil)
   end
+
+  it "returns nil if accessing the constant raises RuntimeError" do
+    expect { NameMapSpecs::BadFile }.to raise_error(RuntimeError)
+    expect(@map.class_or_module("NameMapSpecs::BadFile")).to eq(nil)
+  end
 end
 
 RSpec.describe NameMap, "#dir_name" do