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+/*
+ * This file is part of flex.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+/* Output should match the input. */
+
+%option 8bit nounput nomain noyywrap noinput warn
+%%
+
+abc(?# Single Line Comment )def {M4_TEST_DO(yyecho())}
+ghi(?#
+ multi-line
+ comment
+ )jkl {M4_TEST_DO(yyecho())}
+
+mno(?#
+ multi-line //
+ comment with ##
+ ~~!@#$ %^&*(@-_+=\|,.<>/ ?: ;
+ punctuation
+ )pqr {M4_TEST_DO(yyecho())}
+(?# Start of a rule.)stu {M4_TEST_DO(yyecho())}
+vwxyz(?#End of a rule.) {M4_TEST_DO(yyecho())}
+A(?x: B
+ /* comment */
+ C D) {M4_TEST_DO(yyecho())}
+
+\n {M4_TEST_DO(yyecho())}
+###
+abcdefghijklmnopqrstuvwxyz
+ABCD