Function r_core::r_vlog

pub unsafe extern "C" fn r_vlog(
    funcname: *const c_char, 
    filename: *const c_char, 
    lineno: c_uint, 
    level: RLogLevel, 
    tag: *const c_char, 
    fmtstr: *const c_char, 
    args: *mut __va_list_tag
)