Merge pull request rails#50764 from eugeneius/syntax_error_proxy_nil_backtrace_locations

Handle nil backtrace_locations in SyntaxErrorProxy

Author: eugeneius

actionpack/test/dispatch/exception_wrapper_test.rb

@@ -83,6 +83,14 @@ def backtrace
      end
     end
 
+    test "#source_extracts works with nil backtrace_locations" do
+      exception = begin eval "class Foo; yield; end"; rescue SyntaxError => ex; ex; end
+
+      wrapper = ExceptionWrapper.new(nil, exception)
+
+      assert_empty wrapper.source_extracts
+    end
+
     if defined?(ErrorHighlight) && Gem::Version.new(ErrorHighlight::VERSION) >= Gem::Version.new("0.4.0")
       test "#source_extracts works with error_highlight" do
         lineno = __LINE__

activesupport/lib/active_support/syntax_error_proxy.rb

@@ -32,6 +32,8 @@ def spot(_)
     end
 
     def backtrace_locations
+      return nil if super.nil?
+
       parse_message_for_trace.map { |trace|
         file, line = trace.match(/^(.+?):(\d+).*$/, &:captures) || trace
         BacktraceLocation.new(file, line.to_i, trace)