text: #ifndef RUBY_ASSERT_H
  #define RUBY_ASSERT_H
  
  #if defined(__cplusplus)
  extern "C" {
  #if 0
  } /* satisfy cc-mode */
  #endif
  #endif
  
  NORETURN(void rb_assert_failure(const char *, int, const char *, const char *));
  #ifdef RUBY_FUNCTION_NAME_STRING
  # define RUBY_ASSERT_FAIL(expr) \
      rb_assert_failure(__FILE__, __LINE__, RUBY_FUNCTION_NAME_STRING, expr)
  #else
  # define RUBY_ASSERT_FAIL(expr) \
      rb_assert_failure(__FILE__, __LINE__, NULL, expr)
  #endif
  #define RUBY_ASSERT_MESG(expr, mesg) \
      ((expr) ? (void)0 : RUBY_ASSERT_FAIL(mesg))
  #ifdef HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P
  # define RUBY_ASSERT_MESG_WHEN(cond, expr, mesg) \
      ((RUBY_DEBUG+0) ? RUBY_ASSERT_MESG((expr), mesg) : \
      __builtin_choose_expr( \
          __builtin_constant_p(cond), \
          __builtin_choose_expr(cond, RUBY_ASSERT_MESG(expr, mesg), (void)0), \
          RUBY_ASSERT_MESG(!(cond) || (expr), mesg)))
  #else
  # define RUBY_ASSERT_MESG_WHEN(cond, expr, mesg) \
      RUBY_ASSERT_MESG(!((RUBY_DEBUG+0) || (cond)) || (expr), mesg)
  #endif
  #define RUBY_ASSERT(expr) RUBY_ASSERT_MESG_WHEN((!RUBY_NDEBUG+0), expr, #expr)
  #define RUBY_ASSERT_WHEN(cond, expr) RUBY_ASSERT_MESG_WHEN(cond, expr, #expr)
  #define RUBY_ASSERT_ALWAYS(expr) RUBY_ASSERT_MESG_WHEN(TRUE, expr, #expr)
  
  #ifndef RUBY_DEBUG
  # define RUBY_DEBUG 0
  #endif
  #ifndef RUBY_NDEBUG
  # ifdef NDEBUG
  #   define RUBY_NDEBUG 1
  # else
  #   define RUBY_NDEBUG 0
  # endif
  #endif
  
  #if defined(__cplusplus)
  #if 0
  { /* satisfy cc-mode */
  #endif
  }  /* extern "C" { */
  #endif
  
  #endif
  