Make 'as' an actual keyword when with's future statement is used. Not

actually necessary for functionality, but good for transition.

Grammar/Grammar

@@ -61,8 +61,8 @@ import_stmt: import_name | import_from
 import_name: 'import' dotted_as_names
 import_from: ('from' ('.'* dotted_name | '.')
               'import' ('*' | '(' import_as_names ')' | import_as_names))
-import_as_name: NAME [NAME NAME]
-dotted_as_name: dotted_name [NAME NAME]
+import_as_name: NAME [('as' | NAME) NAME]
+dotted_as_name: dotted_name [('as' | NAME) NAME]
 import_as_names: import_as_name (',' import_as_name)* [',']
 dotted_as_names: dotted_as_name (',' dotted_as_name)*
 dotted_name: NAME ('.' NAME)*
@@ -80,7 +80,7 @@ try_stmt: ('try' ':' suite
 	    ['finally' ':' suite] |
 	   'finally' ':' suite))
 with_stmt: 'with' test [ with_var ] ':' suite
-with_var: NAME expr
+with_var: ('as' | NAME) expr
 # NB compile.c makes sure that the default except clause is last
 except_clause: 'except' [test [',' test]]
 suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT

Parser/parser.c

@@ -144,18 +144,20 @@ classify(parser_state *ps, int type, char *str)
 		register label *l = g->g_ll.ll_label;
 		register int i;
 		for (i = n; i > 0; i--, l++) {
-			if (l->lb_type == NAME && l->lb_str != NULL &&
-					l->lb_str[0] == s[0] &&
-					strcmp(l->lb_str, s) == 0) {
+			if (l->lb_type != NAME || l->lb_str == NULL ||
+			    l->lb_str[0] != s[0] ||
+			    strcmp(l->lb_str, s) != 0)
+				continue;
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
-				if (!(ps->p_flags & CO_FUTURE_WITH_STATEMENT) &&
-				    s[0] == 'w' &&
-				    strcmp(s, "with") == 0)
-					break; /* not a keyword */
-#endif
-				D(printf("It's a keyword\n"));
-				return n - i;
+			if (!(ps->p_flags & CO_FUTURE_WITH_STATEMENT)) {
+				if (s[0] == 'w' && strcmp(s, "with") == 0)
+					break; /* not a keyword yet */
+				else if (s[0] == 'a' && strcmp(s, "as") == 0)
+					break; /* not a keyword yet */
 			}
+#endif
+			D(printf("It's a keyword\n"));
+			return n - i;
 		}
 	}
 	

Parser/parsetok.c

@@ -176,8 +176,8 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
 		    if (len == 4 && str[0] == 'w' && strcmp(str, "with") == 0)
 			warn(with_msg, err_ret->filename, tok->lineno);
 		    else if (!(handling_import || handling_with) &&
-			     len == 2 &&
-			     str[0] == 'a' && strcmp(str, "as") == 0)
+		             len == 2 && str[0] == 'a' &&
+			     strcmp(str, "as") == 0)
 			warn(as_msg, err_ret->filename, tok->lineno);
 		}
 		else if (type == NAME &&

Python/ast.c

@@ -2088,8 +2088,8 @@ static alias_ty
 alias_for_import_name(struct compiling *c, const node *n)
 {
     /*
-      import_as_name: NAME [NAME NAME]
-      dotted_as_name: dotted_name [NAME NAME]
+      import_as_name: NAME ['as' NAME]
+      dotted_as_name: dotted_name ['as' NAME]
       dotted_name: NAME ('.' NAME)*
     */
     PyObject *str;