1 files changed, 19 insertions, 15 deletions
diff --git a/spec/mspec/lib/mspec/matchers/complain.rb b/spec/mspec/lib/mspec/matchers/complain.rb
index 71b6a77680..4bcb255040 100644
--- a/spec/mspec/lib/mspec/matchers/complain.rb
+++ b/spec/mspec/lib/mspec/matchers/complain.rb
@@ -7,44 +7,48 @@ class ComplainMatcher
 
   def matches?(proc)
     @saved_err = $stderr
-    @stderr = $stderr = IOStub.new
     @verbose = $VERBOSE
-    $VERBOSE = false
-
-    proc.call
+    begin
+      err = $stderr = IOStub.new
+      $VERBOSE = false
+      Thread.current[:in_mspec_complain_matcher] = true
+      proc.call
+    ensure
+      $VERBOSE = @verbose
+      $stderr = @saved_err
+      Thread.current[:in_mspec_complain_matcher] = false
+    end
 
+    @warning = err.to_s
     unless @complaint.nil?
       case @complaint
       when Regexp
-        return false unless $stderr =~ @complaint
+        return false unless @warning =~ @complaint
       else
-        return false unless $stderr == @complaint
+        return false unless @warning == @complaint
       end
     end
 
-    return $stderr.empty? ? false : true
-  ensure
-    $VERBOSE = @verbose
-    $stderr = @saved_err
+    return @warning.empty? ? false : true
   end
 
   def failure_message
     if @complaint.nil?
       ["Expected a warning", "but received none"]
     elsif @complaint.kind_of? Regexp
-      ["Expected warning to match: #{@complaint.inspect}", "but got: #{@stderr.chomp.inspect}"]
+      ["Expected warning to match: #{@complaint.inspect}", "but got: #{@warning.chomp.inspect}"]
     else
-      ["Expected warning: #{@complaint.inspect}", "but got: #{@stderr.chomp.inspect}"]
+      ["Expected warning: #{@complaint.inspect}", "but got: #{@warning.chomp.inspect}"]
     end
   end
 
   def negative_failure_message
     if @complaint.nil?
-      ["Unexpected warning: ", @stderr.chomp.inspect]
+      ["Unexpected warning: ", @warning.chomp.inspect]
     elsif @complaint.kind_of? Regexp
-      ["Expected warning not to match: #{@complaint.inspect}", "but got: #{@stderr.chomp.inspect}"]
+      ["Expected warning not to match: #{@complaint.inspect}", "but got: #{@warning.chomp.inspect}"]
     else
-      ["Expected warning: #{@complaint.inspect}", "but got: #{@stderr.chomp.inspect}"]
+      ["Expected warning: #{@complaint.inspect}", "but got: #{@warning.chomp.inspect}"]
     end
   end
 end