Suppress unused variable warnings

16 files changed, 25 insertions, 8 deletions

diff --git a/test/net/ftp/test_ftp.rb b/test/net/ftp/test_ftp.rb
index a5219644bb..39f1220dbb 100644
--- a/test/net/ftp/test_ftp.rb
+++ b/test/net/ftp/test_ftp.rb
@@ -530,6 +530,7 @@ class FTPTest < Test::Unit::TestCase
       sock.print("553 Requested action not taken.\r\n")
       commands.push(sock.gets)
       sock.print("200 Switching to Binary mode.\r\n")
+      [host, port]
     }
     begin
       begin
@@ -711,6 +712,7 @@ class FTPTest < Test::Unit::TestCase
       host, port = process_port_or_eprt(sock, line)
       commands.push(sock.gets)
       sock.print("550 Requested action not taken.\r\n")
+      [host, port]
     }
     begin
       begin
@@ -937,6 +939,7 @@ class FTPTest < Test::Unit::TestCase
       host, port = process_port_or_eprt(sock, line)
       commands.push(sock.gets)
       sock.print("452 Requested file action aborted.\r\n")
+      [host, port]
     }
     begin
       begin
diff --git a/test/objspace/test_objspace.rb b/test/objspace/test_objspace.rb
index 833b372105..336b30f75a 100644
--- a/test/objspace/test_objspace.rb
+++ b/test/objspace/test_objspace.rb
@@ -106,7 +106,7 @@ class TestObjSpace < Test::Unit::TestCase
   end
 
   def test_memsize_of_iseq
-    iseqw = RubyVM::InstructionSequence.compile('def a; a = :b; end')
+    iseqw = RubyVM::InstructionSequence.compile('def a; a = :b; a; end')
     base_obj_size = ObjectSpace.memsize_of(Object.new)
     assert_operator(ObjectSpace.memsize_of(iseqw), :>, base_obj_size)
   end
diff --git a/test/ruby/test_ast.rb b/test/ruby/test_ast.rb
index e782653755..9598aa7553 100644
--- a/test/ruby/test_ast.rb
+++ b/test/ruby/test_ast.rb
@@ -205,9 +205,9 @@ class TestAst < Test::Unit::TestCase
   end
 
   def test_scope_local_variables
-    node = RubyVM::AbstractSyntaxTree.parse("x = 0")
+    node = RubyVM::AbstractSyntaxTree.parse("_x = 0")
     lv, _, body = *node.children
-    assert_equal([:x], lv)
+    assert_equal([:_x], lv)
     assert_equal(:LASGN, body.type)
   end
 
diff --git a/test/ruby/test_eval.rb b/test/ruby/test_eval.rb
index 8900b4f165..49bb3305e4 100644
--- a/test/ruby/test_eval.rb
+++ b/test/ruby/test_eval.rb
@@ -345,6 +345,7 @@ class TestEval < Test::Unit::TestCase
       # assert_equal(1, eval("foo11"))
       assert_equal(eval("foo22"), eval("foo22", p))
       assert_equal(55, eval("foo22"))
+      assert_equal(55, foo22)
     }.call
   end
 
diff --git a/test/ruby/test_flip.rb b/test/ruby/test_flip.rb
index 8ea6416bdb..9156be0553 100644
--- a/test/ruby/test_flip.rb
+++ b/test/ruby/test_flip.rb
@@ -29,7 +29,7 @@ class TestFlip < Test::Unit::TestCase
     assert_nothing_raised(NotImplementedError, bug6899) do
       2000.times {eval %[(foo..bar) ? 1 : 2]}
     end
-    foo = bar
+    [foo, bar]
   end
 
   def test_shared_eval
@@ -38,6 +38,7 @@ class TestFlip < Test::Unit::TestCase
     eval("vs.select {|n| if n==2..n==16 then 1 end}")
     v = eval("vs.select {|n| if n==3..n==6 then 1 end}")
     assert_equal([*3..6], v, bug7671)
+    vs
   end
 
   def test_shared_thread
diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index b5fb532c72..c63ef51bd3 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -17,6 +17,7 @@ class TestGc < Test::Unit::TestCase
       1.upto(10000) {
         tmp = [0,1,2,3,4,5,6,7,8,9]
       }
+      tmp
     end
     l=nil
     100000.times {
diff --git a/test/ruby/test_gc_compact.rb b/test/ruby/test_gc_compact.rb
index 94acbb3a4d..4228ceeb1d 100644
--- a/test/ruby/test_gc_compact.rb
+++ b/test/ruby/test_gc_compact.rb
@@ -119,6 +119,8 @@ class TestGCCompact < Test::Unit::TestCase
     collisions = GC.stat(:object_id_collisions)
     skip "couldn't get objects to collide" if collisions == 0
     assert_operator collisions, :>, 0
+    ids.clear
+    new_tenants.clear
   end
 
   def test_complex_hash_keys
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index ac3f9a355d..f10a6659ba 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -452,7 +452,7 @@ class TestISeq < Test::Unit::TestCase
         class B
           2.times {
             def self.foo
-              a = 'good day'
+              _a = 'good day'
               raise
             rescue
               'dear reader'
diff --git a/test/ruby/test_literal.rb b/test/ruby/test_literal.rb
index 3f5acde3df..3f87f860b1 100644
--- a/test/ruby/test_literal.rb
+++ b/test/ruby/test_literal.rb
@@ -187,7 +187,7 @@ class TestRubyLiteral < Test::Unit::TestCase
   if defined?(RubyVM::InstructionSequence.compile_option) and
     RubyVM::InstructionSequence.compile_option.key?(:debug_frozen_string_literal)
     def test_debug_frozen_string
-      src = 'n = 1; "foo#{n ? "-#{n}" : ""}"'; f = "test.rb"; n = 1
+      src = 'n = 1; _="foo#{n ? "-#{n}" : ""}"'; f = "test.rb"; n = 1
       opt = {frozen_string_literal: true, debug_frozen_string_literal: true}
       str = RubyVM::InstructionSequence.compile(src, f, f, n, opt).eval
       assert_equal("foo-1", str)
diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 75daf61376..953f6417b0 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -615,6 +615,8 @@ class TestM17N < Test::Unit::TestCase
     r1 = Regexp.new('\xa1'.force_encoding("ascii-8bit"))
     r2 = eval('/\xa1#{r1}/'.force_encoding('ascii-8bit'))
     assert_equal(Encoding::ASCII_8BIT, r2.encoding)
+
+    [r1, r2]
   end
 
   def test_regexp_named_class
diff --git a/test/ruby/test_optimization.rb b/test/ruby/test_optimization.rb
index 5f360779cf..1a7d62817f 100644
--- a/test/ruby/test_optimization.rb
+++ b/test/ruby/test_optimization.rb
@@ -751,6 +751,7 @@ class TestRubyOptimization < Test::Unit::TestCase
     h = {}
     assert_equal(bug, eval('{ok: 42, **h}; bug'))
     assert_equal(:ok, eval('{ok: bug = :ok, **h}; bug'))
+    assert_empty(h)
   end
 
   def test_overwritten_blockparam
diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index b63f170981..287c8358a0 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -481,6 +481,7 @@ class TestParse < Test::Unit::TestCase
     t[42, &blk] ||= t.dummy 42 # command_asgn test
     END
     assert_equal([:aref, :aset], a)
+    blk
   end
 
   def test_backquote
@@ -1148,7 +1149,7 @@ x = __ENCODING__
     end
     o.instance_eval {i (-1.3).abs}
     assert_equal(1.3, o.x)
-    o.instance_eval {i = 0; i (-1.3).abs}
+    o.instance_eval {i = 0; i (-1.3).abs; i}
     assert_equal(1.3, o.x)
   end
 
@@ -1157,6 +1158,7 @@ x = __ENCODING__
       $VERBOSE = true
       x = 1
       eval("if false; 0 < x < 2; end")
+      x
     end
   end
 
diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index 17def93362..bc270115df 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -1302,7 +1302,7 @@ class TestProc < Test::Unit::TestCase
   def test_local_variables
     b = get_binding
     assert_equal(%i'if case when begin end a', b.local_variables)
-    a = tap {|;x, y| x = y; break binding.local_variables}
+    a = tap {|;x, y| x = y = x; break binding.local_variables}
     assert_equal(%i[a b x y], a.sort)
   end
 
diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index 59029de890..afb4784d00 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -1562,6 +1562,7 @@ class TestRefinement < Test::Unit::TestCase
         undef :foo
       end
     end
+    ext
   end
 
   def test_call_refined_method_in_duplicate_module
@@ -2291,6 +2292,7 @@ class TestRefinement < Test::Unit::TestCase
       end
     end
     assert_equal("[C[A[B]]]", c.new.foo, '[ruby-dev:50390] [Bug #14232]')
+    d
   end
 
   private
diff --git a/test/socket/test_socket.rb b/test/socket/test_socket.rb
index e07c1d633f..6cbf3edca8 100644
--- a/test/socket/test_socket.rb
+++ b/test/socket/test_socket.rb
@@ -736,6 +736,7 @@ class TestSocket < Test::Unit::TestCase
     ret, addr, rflags = s1.recvmsg(10, 0)
     assert_equal "b" * 10, ret
     assert_equal Socket::MSG_TRUNC, rflags & Socket::MSG_TRUNC if !rflags.nil?
+    addr
   ensure
     s1.close
     s2.close
diff --git a/test/test_open3.rb b/test/test_open3.rb
index 848f70b07d..24bd08e597 100644
--- a/test/test_open3.rb
+++ b/test/test_open3.rb
@@ -320,5 +320,6 @@ class TestOpen3 < Test::Unit::TestCase
     command = [RUBY, '-e', 'puts "test_integer_and_symbol_key"']
     out, status = Open3.capture2(*command, :chdir => '.', 2 => IO::NULL)
     assert_equal("test_integer_and_symbol_key\n", out)
+    assert_predicate(status, :success?)
   end
 end