+DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", 'e', 3)
+
+/* A placeholder for an expression that is not type-dependent, but
+ does occur in a template. When an expression that is not
+ type-dependent appears in a larger expression, we must compute the
+ type of that larger expression. That computation would normally
+ modify the original expression, which would change the mangling of
+ that expression if it appeared in a template argument list. In
+ that situation, we create a NON_DEPENDENT_EXPR to take the place of
+ the original expression. The expression is the only operand -- it
+ is only needed for diagnostics. */
+DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", 'e', 1)
+
+/* CTOR_INITIALIZER is a placeholder in template code for a call to
+ setup_vtbl_pointer (and appears in all functions, not just ctors). */
+DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", 'e', 1)
+
+DEFTREECODE (TRY_BLOCK, "try_block", 'e', 2)
+
+DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", 'e', 2)
+
+/* A HANDLER wraps a catch handler for the HANDLER_TYPE. If this is
+ CATCH_ALL_TYPE, then the handler catches all types. The declaration of
+ the catch variable is in HANDLER_PARMS, and the body block in
+ HANDLER_BODY. */
+DEFTREECODE (HANDLER, "handler", 'e', 2)
+
+/* A MUST_NOT_THROW_EXPR wraps an expression that may not
+ throw, and must call terminate if it does. */
+DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", 'e', 1)
+
+/* A CLEANUP_STMT marks the point at which a declaration is fully
+ constructed. The CLEANUP_EXPR is run on behalf of CLEANUP_DECL
+ when CLEANUP_BODY completes. */
+DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", 'e', 3)
+
+/* Represents an 'if' statement. The operands are IF_COND,
+ THEN_CLAUSE, and ELSE_CLAUSE, respectively. */
+/* ??? It is currently still necessary to distinguish between IF_STMT
+ and COND_EXPR for the benefit of templates. */