Suppress "assigned but unused variable" warnings

lib/irb/ruby-lex.rb

@@ -34,7 +34,7 @@ class RubyLex
     line_no = 1
     begin
       result = yield code, line_no
-    rescue ArgumentError => e
+    rescue ArgumentError
       code = ";\n#{code}"
       line_no = 0
       result = yield code, line_no

test/fiber/test_io.rb

@@ -44,14 +44,14 @@ class TestFiberIO < Test::Unit::TestCase
     skip unless defined?(UNIXSocket)
 
     16.times.map do
-      thread = Thread.new do
+      Thread.new do
         i, o = UNIXSocket.pair
 
         scheduler = Scheduler.new
         Thread.current.scheduler = scheduler
 
         Fiber do
-          message = i.read(20)
+          i.read(20)
           i.close
         end