1 files changed, 4 insertions, 18 deletions
diff --git a/src/librustdoc/config.rs b/src/librustdoc/config.rs
index 2c514a0c8..1be4f364e 100644
--- a/src/librustdoc/config.rs
+++ b/src/librustdoc/config.rs
@@ -1,12 +1,10 @@
 use std::collections::BTreeMap;
-use std::convert::TryFrom;
 use std::ffi::OsStr;
 use std::fmt;
 use std::path::PathBuf;
 use std::str::FromStr;
 
 use rustc_data_structures::fx::FxHashMap;
-use rustc_driver::print_flag_list;
 use rustc_session::config::{
     self, parse_crate_types_from_list, parse_externs, parse_target_triple, CrateType,
 };
@@ -31,18 +29,13 @@ use crate::passes::{self, Condition};
 use crate::scrape_examples::{AllCallLocations, ScrapeExamplesOptions};
 use crate::theme;
 
-#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, Default)]
 pub(crate) enum OutputFormat {
     Json,
+    #[default]
     Html,
 }
 
-impl Default for OutputFormat {
-    fn default() -> OutputFormat {
-        OutputFormat::Html
-    }
-}
-
 impl OutputFormat {
     pub(crate) fn is_json(&self) -> bool {
         matches!(self, OutputFormat::Json)
@@ -235,7 +228,7 @@ pub(crate) struct RenderOptions {
     pub(crate) extension_css: Option<PathBuf>,
     /// A map of crate names to the URL to use instead of querying the crate's `html_root_url`.
     pub(crate) extern_html_root_urls: BTreeMap<String, String>,
-    /// Whether to give precedence to `html_root_url` or `--exten-html-root-url`.
+    /// Whether to give precedence to `html_root_url` or `--extern-html-root-url`.
     pub(crate) extern_html_root_takes_precedence: bool,
     /// A map of the default settings (values are as for DOM storage API). Keys should lack the
     /// `rustdoc-` prefix.
@@ -333,14 +326,7 @@ impl Options {
             return Err(0);
         }
 
-        let z_flags = matches.opt_strs("Z");
-        if z_flags.iter().any(|x| *x == "help") {
-            print_flag_list("-Z", config::Z_OPTIONS);
-            return Err(0);
-        }
-        let c_flags = matches.opt_strs("C");
-        if c_flags.iter().any(|x| *x == "help") {
-            print_flag_list("-C", config::CG_OPTIONS);
+        if rustc_driver::describe_flag_categories(&matches) {
             return Err(0);
         }