proc.c: proc without block

* proc.c (proc_new): promoted lambda/proc/Proc.new with no block
  in a method called with a block to a warning/error.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66772 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 31 insertions, 14 deletions

diff --git a/spec/ruby/core/proc/block_pass_spec.rb b/spec/ruby/core/proc/block_pass_spec.rb
index 282f00b5a8..917a38efac 100644
--- a/spec/ruby/core/proc/block_pass_spec.rb
+++ b/spec/ruby/core/proc/block_pass_spec.rb
@@ -20,22 +20,39 @@ describe "Proc as a block pass argument" do
   end
 end
 
-describe "Proc as an implicit block pass argument" do
-  def revivify
-    Proc.new
-  end
+ruby_version_is ""..."2.7" do
+  describe "Proc as an implicit block pass argument" do
+    def revivify
+      Proc.new
+    end
 
-  it "remains the same object if re-vivified by the target method" do
-    p = Proc.new {}
-    p2 = revivify(&p)
-    p.should equal p2
-    p.should == p2
+    it "remains the same object if re-vivified by the target method" do
+      p = Proc.new {}
+      p2 = revivify(&p)
+      p.should equal p2
+      p.should == p2
+    end
+
+    it "remains the same object if reconstructed with Proc.new" do
+      p = Proc.new {}
+      p2 = Proc.new(&p)
+      p.should equal p2
+      p.should == p2
+    end
   end
+end
 
-  it "remains the same object if reconstructed with Proc.new" do
-    p = Proc.new {}
-    p2 = Proc.new(&p)
-    p.should equal p2
-    p.should == p2
+ruby_version_is "2.7" do
+  describe "Proc called with no block" do
+    def revivify
+      Proc.new
+    end
+
+    it "raises ArgumentError when called with no block" do
+      p = Proc.new {}
+      -> {
+        revivify(&p)
+      }.should
+    end
   end
 end