This file is indexed.

/usr/include/x86_64-linux-musl/err.h is in musl-dev 0.9.15-1.

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The actual contents of the file can be viewed below.

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#ifndef _ERR_H
#define _ERR_H

#include <features.h>
#include <stdarg.h>

#ifdef __cplusplus
extern "C" {
#endif

void warn(const char *, ...);
void vwarn(const char *, va_list);
void warnx(const char *, ...);
void vwarnx(const char *, va_list);

_Noreturn void err(int, const char *, ...);
_Noreturn void verr(int, const char *, va_list);
_Noreturn void errx(int, const char *, ...);
_Noreturn void verrx(int, const char *, va_list);

#ifdef __cplusplus
}
#endif

#endif