C_RID_YYCODE was deleted a long time ago:

2003-02-18  Geoffrey Keating  <geo...@apple.com>

        * cp-tree.h (rid_to_yy): Delete.
        (C_RID_YYCODE): Delete.
        (finish_file): Delete redundant declaration.

so let's 86 the references to it.

Applying to trunk.

2017-03-23  Marek Polacek  <pola...@redhat.com>

        * c-tree.h: Remove a C_RID_YYCODE reference.

        * cp-tree.h: Remove a C_RID_YYCODE reference.

diff --git gcc/c/c-tree.h gcc/c/c-tree.h
index 13e40e6..9428d74 100644
--- gcc/c/c-tree.h
+++ gcc/c/c-tree.h
@@ -43,8 +43,7 @@ along with GCC; see the file COPYING3.  If not see
 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
 
 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
-   keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
-   and C_RID_YYCODE is the token number wanted by Yacc.  */
+   keyword.  C_RID_CODE (node) is then the RID_* value of the keyword.  */
 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
 
 /* Record whether a type or decl was written with nonconstant size.
diff --git gcc/cp/cp-tree.h gcc/cp/cp-tree.h
index 5be5dfe..9f02a97 100644
--- gcc/cp/cp-tree.h
+++ gcc/cp/cp-tree.h
@@ -346,8 +346,7 @@ identifier_p (tree t)
 }
 
 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
-   keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
-   and C_RID_YYCODE is the token number wanted by Yacc.  */
+   keyword.  C_RID_CODE (node) is then the RID_* value of the keyword.  */
 
 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_5 (ID)
 

        Marek

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