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// re2c $INPUT -o $OUTPUT -i --case-ranges
#include <assert.h>
bool lex(const char *s) {
const char *YYCURSOR = s;
/*!re2c
re2c:yyfill:enable = 0;
re2c:define:YYCTYPE = char;
number = [1-9][0-9]*;
number { return true; }
* { return false; }
*/
}
int main() {
assert(lex("1234"));
return 0;
}