1 files changed, 12 insertions, 2 deletions
diff --git a/spec/mspec/lib/mspec/utils/warnings.rb b/spec/mspec/lib/mspec/utils/warnings.rb
index ef5e5c692c..4d23474236 100644
--- a/spec/mspec/lib/mspec/utils/warnings.rb
+++ b/spec/mspec/lib/mspec/utils/warnings.rb
@@ -1,6 +1,6 @@
 require 'mspec/guards/version'
 
-if RUBY_ENGINE == "ruby" and RUBY_VERSION >= "2.4.0"
+if RUBY_ENGINE == "ruby" and ruby_version_is("2.4")
   ruby_version_is "2.4"..."2.5" do
     # Kernel#warn does not delegate to Warning.warn in 2.4
     module Kernel
@@ -16,9 +16,19 @@ if RUBY_ENGINE == "ruby" and RUBY_VERSION >= "2.4.0"
   end
 
   def Warning.warn(message)
+    if Thread.current[:in_mspec_complain_matcher]
+      return $stderr.write(message)
+    end
+
     case message
     # $VERBOSE = true warnings
-    when /possibly useless use of (<|<=|==|>=|>|\+|-) in void context/
+    when /(.+\.rb):(\d+):.+possibly useless use of (<|<=|==|>=|>) in void context/
+      # Make sure there is a .should otherwise it is missing
+      line_nb = Integer($2)
+      unless File.exist?($1) and /\.should(_not)? (<|<=|==|>=|>)/ === File.readlines($1)[line_nb-1]
+        $stderr.write message
+      end
+    when /possibly useless use of (\+|-) in void context/
     when /assigned but unused variable/
     when /method redefined/
     when /previous definition of/