https://git.ruby-lang.org/ruby.git/commit/?id=bf34ade7ef

From bf34ade7ef32f89aa5ba238d0a780f23eacb0487 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 12 Nov 2019 22:58:09 +0900
Subject: Show the name `Kernel#proc` in the warning message


diff --git a/proc.c b/proc.c
index 1f2e311..560b641 100644
--- a/proc.c
+++ b/proc.c
@@ -741,7 +741,7 @@ rb_func_lambda_new(rb_block_call_func_t func, VALUE val, int min_argc, int max_a https://github.com/ruby/ruby/blob/trunk/proc.c#L741
 static const char proc_without_block[] = "tried to create Proc object without a block";
 
 static VALUE
-proc_new(VALUE klass, int8_t is_lambda)
+proc_new(VALUE klass, int8_t is_lambda, int8_t kernel)
 {
     VALUE procval;
     const rb_execution_context_t *ec = GET_EC();
@@ -757,11 +757,13 @@ proc_new(VALUE klass, int8_t is_lambda) https://github.com/ruby/ruby/blob/trunk/proc.c#L757
                 rb_raise(rb_eArgError, proc_without_block);
             }
             else {
-                rb_warn("Capturing the given block using Proc.new is deprecated; use `&block` instead");
+                const char *name = kernel ? "Kernel#proc" : "Proc.new";
+                rb_warn("Capturing the given block using %s is deprecated; "
+                        "use `&block` instead", name);
 	    }
 	}
 #else
-	if (0)
+	if (0);
 #endif
 	else {
 	    rb_raise(rb_eArgError, proc_without_block);
@@ -817,7 +819,7 @@ proc_new(VALUE klass, int8_t is_lambda) https://github.com/ruby/ruby/blob/trunk/proc.c#L819
 static VALUE
 rb_proc_s_new(int argc, VALUE *argv, VALUE klass)
 {
-    VALUE block = proc_new(klass, FALSE);
+    VALUE block = proc_new(klass, FALSE, FALSE);
 
     rb_obj_call_init_kw(block, argc, argv, RB_PASS_CALLED_KEYWORDS);
     return block;
@@ -826,7 +828,7 @@ rb_proc_s_new(int argc, VALUE *argv, VALUE klass) https://github.com/ruby/ruby/blob/trunk/proc.c#L828
 VALUE
 rb_block_proc(void)
 {
-    return proc_new(rb_cProc, FALSE);
+    return proc_new(rb_cProc, FALSE, FALSE);
 }
 
 /*
@@ -839,13 +841,13 @@ rb_block_proc(void) https://github.com/ruby/ruby/blob/trunk/proc.c#L841
 static VALUE
 f_proc(VALUE _)
 {
-    return rb_block_proc();
+    return proc_new(rb_cProc, FALSE, TRUE);
 }
 
 VALUE
 rb_block_lambda(void)
 {
-    return proc_new(rb_cProc, TRUE);
+    return proc_new(rb_cProc, TRUE, FALSE);
 }
 
 /*
diff --git a/spec/ruby/core/kernel/proc_spec.rb b/spec/ruby/core/kernel/proc_spec.rb
index ded2cec..2a79548 100644
--- a/spec/ruby/core/kernel/proc_spec.rb
+++ b/spec/ruby/core/kernel/proc_spec.rb
@@ -56,7 +56,7 @@ describe "Kernel#proc" do https://github.com/ruby/ruby/blob/trunk/spec/ruby/core/kernel/proc_spec.rb#L56
 
       -> {
         some_method { "hello" }
-      }.should complain(/Capturing the given block using Proc.new is deprecated/)
+      }.should complain(/Capturing the given block using Kernel#proc is deprecated/)
     end
   end
 end
diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index 467bbf5..f09e58e 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -55,7 +55,10 @@ class TestProc < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_proc.rb#L55
 
   def assert_arity(n)
     meta = class << self; self; end
-    meta.class_eval {define_method(:foo, Proc.new)}
+    b = assert_warn(/Capturing the given block using Proc\.new is deprecated/) do
+      Proc.new
+    end
+    meta.class_eval {define_method(:foo, b)}
     assert_equal(n, method(:foo).arity)
   end
 
@@ -1413,7 +1416,9 @@ class TestProc < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_proc.rb#L1416
   end
 
   def method_for_test_proc_without_block_for_symbol
-    binding.eval('proc')
+    assert_warn(/Capturing the given block using Kernel#proc is deprecated/) do
+      binding.eval('proc')
+    end
   end
 
   def test_proc_without_block_for_symbol
-- 
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