Otherwise, it is searched for globally.
@end defun
+@defun Type.optimized_out ()
+Return @code{gdb.Value} instance of this type whose value is optimized
+out. This allows a frame decorator to indicate that the value of an
+argument or a local variable is not known.
+@end defun
Each type has a code, which indicates what category this type falls
into. The available type categories are represented by constants