pub unsafe extern "C" fn fz_vlog_error_printf(
ctx: *mut fz_context,
fmt: *const c_char,
ap: *mut __va_list_tag,
)pub unsafe extern "C" fn fz_vlog_error_printf(
ctx: *mut fz_context,
fmt: *const c_char,
ap: *mut __va_list_tag,
)