https://git.ruby-lang.org/ruby.git/commit/?id=b18a6b648e

From b18a6b648e3c74a3b7360d2557015b05aa8b0390 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Fri, 10 Apr 2020 22:03:03 +0900
Subject: include/ruby/3: do not skip RUBY3_UNREACHABLE_RETURN

Revert "Revert "include/ruby/3/core/rtypeddata.h: Use 0 instead of NULL for C++ compiler""
Revert "include/ruby/3/core/rtypeddata.h: Use 0 instead of NULL for C++ compiler"
Revert "include/ruby/3: Skip RUBY3_UNREACHABLE_RETURN for icc"
Revert "include/ruby/3: Stop RUBY3_UNREACHABLE_RETURN to suppress a SunC warning"

This reverts commit b965e7e05e4307e3c4b396673e63dbc493ef2f20.
This reverts commit d2bb2e066b5a914283dd3ea473fc1762183af013.
This reverts commit 8ab4c55e7a70f5a5bd041d93f425eeef4a47c01e.
This reverts commit 78eec3cdc5ff0664b421e041f4f70a814542b914.

After https://github.com/ruby/ruby/pull/3011, we no longer need these
ifdef guards.

diff --git a/include/ruby/3/core/rtypeddata.h b/include/ruby/3/core/rtypeddata.h
index 21b0857..cc00fa2 100644
--- a/include/ruby/3/core/rtypeddata.h
+++ b/include/ruby/3/core/rtypeddata.h
@@ -160,9 +160,7 @@ RTYPEDDATA_TYPE(VALUE obj) https://github.com/ruby/ruby/blob/trunk/include/ruby/3/core/rtypeddata.h#L160
 #if ! RUBY_NDEBUG
     if (RB_UNLIKELY(! RTYPEDDATA_P(obj))) {
         rb_unexpected_type(obj, RUBY_T_DATA);
-# if ! defined(__sun) && ! RUBY3_COMPILER_IS(Intel)
         RUBY3_UNREACHABLE_RETURN(NULL);
-# endif
     }
 #endif
 
diff --git a/include/ruby/3/memory.h b/include/ruby/3/memory.h
index 4e9741e..9001fd2 100644
--- a/include/ruby/3/memory.h
+++ b/include/ruby/3/memory.h
@@ -253,9 +253,7 @@ ruby3_size_mul_or_raise(size_t x, size_t y) https://github.com/ruby/ruby/blob/trunk/include/ruby/3/memory.h#L253
     }
     else {
         ruby_malloc_size_overflow(x, y);
-# if ! defined(__sun) && ! RUBY3_COMPILER_IS(Intel)
         RUBY3_UNREACHABLE_RETURN(0);
-# endif
     }
 }
 
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