Remove RUBY_GC_HEAP_INIT_SLOTS environment variable

Author: nobu

ruby.c

@@ -1811,13 +1811,6 @@ ruby_opt_init(ruby_cmdline_options_t *opt)
         }
     }
 
-    /* [Feature #19785] Warning for removed GC environment variable.
-     * Remove this in Ruby 3.4. */
-    if (getenv("RUBY_GC_HEAP_INIT_SLOTS")) {
-        rb_warn_deprecated("The environment variable RUBY_GC_HEAP_INIT_SLOTS",
-                           "environment variables RUBY_GC_HEAP_%d_INIT_SLOTS");
-    }
-
     Init_ext(); /* load statically linked extensions before rubygems */
     Init_extra_exts();
 

test/ruby/test_gc.rb

@@ -453,13 +453,6 @@ class << b; end
   end
 
   def test_gc_parameter
-    env = {
-      "RUBY_GC_HEAP_INIT_SLOTS" => "100"
-    }
-    assert_in_out_err([env, "-W0", "-e", "exit"], "", [], [])
-    assert_in_out_err([env, "-W:deprecated", "-e", "exit"], "", [],
-                       /The environment variable RUBY_GC_HEAP_INIT_SLOTS is deprecated; use environment variables RUBY_GC_HEAP_%d_INIT_SLOTS instead/)
-
     env = {}
     GC.stat_heap.keys.each do |heap|
       env["RUBY_GC_HEAP_#{heap}_INIT_SLOTS"] = "200000"