spec: suppress deprecations of "lambda(&proc_block)" pattern

spec/ruby/core/kernel/lambda_spec.rb

@@ -27,9 +27,11 @@ describe "Kernel.lambda" do
   end
 
   it "creates a lambda-style Proc if given a literal block via Kernel.public_send" do
+    suppress_warning do
       l = Kernel.public_send(:lambda) { 42 }
       l.lambda?.should be_true
     end
+  end
 
   it "returns the passed Proc if given an existing Proc" do
     some_proc = proc {}
@@ -39,12 +41,14 @@ describe "Kernel.lambda" do
   end
 
   it "creates a lambda-style Proc when called with zsuper" do
+    suppress_warning do
       l = KernelSpecs::LambdaSpecs::ForwardBlockWithZSuper.new.lambda { 42 }
       l.lambda?.should be_true
       l.call.should == 42
 
       lambda { l.call(:extra) }.should raise_error(ArgumentError)
     end
+  end
 
   it "returns the passed Proc if given an existing Proc through super" do
     some_proc = proc { }

spec/ruby/core/kernel/shared/lambda.rb

@@ -4,6 +4,8 @@ describe :kernel_lambda, shared: true do
   end
 
   it "raises an ArgumentError when no block is given" do
+    suppress_warning do
       -> { send(@method) }.should raise_error(ArgumentError)
     end
+  end
 end

spec/ruby/language/lambda_spec.rb

@@ -348,8 +348,10 @@ describe "A lambda expression 'lambda { ... }'" do
   end
 
   it "requires a block" do
+    suppress_warning do
       lambda { lambda }.should raise_error(ArgumentError)
     end
+  end
 
   it "may include a rescue clause" do
     eval('lambda do raise ArgumentError; rescue ArgumentError; 7; end').should be_an_instance_of(Proc)
@@ -375,12 +377,14 @@ describe "A lambda expression 'lambda { ... }'" do
     ruby_version_is "2.7" do
       it "raises ArgumentError" do
         implicit_lambda = nil
+        suppress_warning do
           -> {
             meth { 1 }
           }.should raise_error(ArgumentError, /tried to create Proc object without a block/)
         end
       end
     end
+  end
 
   context "assigns no local variables" do
     evaluate <<-ruby do