backtrace can be nil.

Surprisingly, on SystemStackError#backtrace can return nil.
ruby · Jul 31, 2019 · cac44de · cac44de
1 parent efac0a2
commit cac44de
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/tool/lib/minitest/unit.rb b/tool/lib/minitest/unit.rb
@@ -984,6 +984,9 @@ def record suite, method, assertions, time, error
 
     def location e # :nodoc:
       last_before_assertion = ""
+
+      return '<empty>' unless e.backtrace # SystemStackError can return nil.
+
       e.backtrace.reverse_each do |s|
         break if s =~ /in .(assert|refute|flunk|pass|fail|raise|must|wont)/
         last_before_assertion = s