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+(* This Source Code Form is subject to the terms of the Mozilla Public License,
+ v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ obtain one at https://mozilla.org/MPL/2.0/. *)
+module;
+
+proc isdigit*(c: Int ) -> Int; extern;
+proc isalnum*(c: Int) -> Int; extern;
+proc isalpha*(c: Int) -> Int; extern;
+proc isspace*(c: Int) -> Int; extern;
+
+proc tolower*(c: Int) -> Int; extern;
+proc toupper*(c: Int) -> Int; extern;
+
+end.