Auto merge of #80206 - poliorcetics:rustdoc-default-langstring, r=GuillaumeGomez,jyn514

impl Default for LangString, replacing all_false by default

Fix #80015

`@rustbot` label C-cleanup  T-rustdoc  A-markdown-parsing

Author: bors

src/librustdoc/html/markdown.rs

@@ -204,7 +204,7 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for CodeBlocks<'_, 'a, I> {
                 CodeBlockKind::Fenced(ref lang) => {
                     LangString::parse_without_check(&lang, self.check_error_codes, false)
                 }
-                CodeBlockKind::Indented => LangString::all_false(),
+                CodeBlockKind::Indented => Default::default(),
             };
             if !parse_result.rust {
                 return Some(Event::Start(Tag::CodeBlock(kind)));
@@ -666,7 +666,7 @@ crate fn find_testable_code<T: doctest::Tester>(
                 let block_info = match kind {
                     CodeBlockKind::Fenced(ref lang) => {
                         if lang.is_empty() {
-                            LangString::all_false()
+                            Default::default()
                         } else {
                             LangString::parse(
                                 lang,
@@ -676,7 +676,7 @@ crate fn find_testable_code<T: doctest::Tester>(
                             )
                         }
                     }
-                    CodeBlockKind::Indented => LangString::all_false(),
+                    CodeBlockKind::Indented => Default::default(),
                 };
                 if !block_info.rust {
                     continue;
@@ -779,22 +779,24 @@ crate enum Ignore {
     Some(Vec<String>),
 }
 
-impl LangString {
-    fn all_false() -> LangString {
-        LangString {
+impl Default for LangString {
+    fn default() -> Self {
+        Self {
             original: String::new(),
             should_panic: false,
             no_run: false,
             ignore: Ignore::None,
-            rust: true, // NB This used to be `notrust = false`
+            rust: true,
             test_harness: false,
             compile_fail: false,
             error_codes: Vec::new(),
             allow_fail: false,
             edition: None,
         }
     }
+}
 
+impl LangString {
     fn parse_without_check(
         string: &str,
         allow_error_code_check: ErrorCodes,
@@ -812,7 +814,7 @@ impl LangString {
         let allow_error_code_check = allow_error_code_check.as_bool();
         let mut seen_rust_tags = false;
         let mut seen_other_tags = false;
-        let mut data = LangString::all_false();
+        let mut data = LangString::default();
         let mut ignores = vec![];
 
         data.original = string.to_owned();
@@ -1230,7 +1232,7 @@ crate fn rust_code_blocks(md: &str, extra_info: &ExtraInfo<'_, '_>) -> Vec<RustC
                 CodeBlockKind::Fenced(syntax) => {
                     let syntax = syntax.as_ref();
                     let lang_string = if syntax.is_empty() {
-                        LangString::all_false()
+                        Default::default()
                     } else {
                         LangString::parse(&*syntax, ErrorCodes::Yes, false, Some(extra_info))
                     };

src/librustdoc/html/markdown/tests.rs

@@ -56,71 +56,59 @@ fn test_lang_string_parse() {
         assert_eq!(LangString::parse(s, ErrorCodes::Yes, true, None), lg)
     }
 
-    t(LangString::all_false());
-    t(LangString { original: "rust".into(), ..LangString::all_false() });
-    t(LangString { original: "sh".into(), rust: false, ..LangString::all_false() });
-    t(LangString { original: "ignore".into(), ignore: Ignore::All, ..LangString::all_false() });
+    t(Default::default());
+    t(LangString { original: "rust".into(), ..Default::default() });
+    t(LangString { original: "sh".into(), rust: false, ..Default::default() });
+    t(LangString { original: "ignore".into(), ignore: Ignore::All, ..Default::default() });
     t(LangString {
         original: "ignore-foo".into(),
         ignore: Ignore::Some(vec!["foo".to_string()]),
-        ..LangString::all_false()
-    });
-    t(LangString {
-        original: "should_panic".into(),
-        should_panic: true,
-        ..LangString::all_false()
-    });
-    t(LangString { original: "no_run".into(), no_run: true, ..LangString::all_false() });
-    t(LangString {
-        original: "test_harness".into(),
-        test_harness: true,
-        ..LangString::all_false()
+        ..Default::default()
     });
+    t(LangString { original: "should_panic".into(), should_panic: true, ..Default::default() });
+    t(LangString { original: "no_run".into(), no_run: true, ..Default::default() });
+    t(LangString { original: "test_harness".into(), test_harness: true, ..Default::default() });
     t(LangString {
         original: "compile_fail".into(),
         no_run: true,
         compile_fail: true,
-        ..LangString::all_false()
-    });
-    t(LangString { original: "allow_fail".into(), allow_fail: true, ..LangString::all_false() });
-    t(LangString {
-        original: "{.no_run .example}".into(),
-        no_run: true,
-        ..LangString::all_false()
+        ..Default::default()
     });
+    t(LangString { original: "allow_fail".into(), allow_fail: true, ..Default::default() });
+    t(LangString { original: "{.no_run .example}".into(), no_run: true, ..Default::default() });
     t(LangString {
         original: "{.sh .should_panic}".into(),
         should_panic: true,
         rust: false,
-        ..LangString::all_false()
+        ..Default::default()
     });
-    t(LangString { original: "{.example .rust}".into(), ..LangString::all_false() });
+    t(LangString { original: "{.example .rust}".into(), ..Default::default() });
     t(LangString {
         original: "{.test_harness .rust}".into(),
         test_harness: true,
-        ..LangString::all_false()
+        ..Default::default()
     });
     t(LangString {
         original: "text, no_run".into(),
         no_run: true,
         rust: false,
-        ..LangString::all_false()
+        ..Default::default()
     });
     t(LangString {
         original: "text,no_run".into(),
         no_run: true,
         rust: false,
-        ..LangString::all_false()
+        ..Default::default()
     });
     t(LangString {
         original: "edition2015".into(),
         edition: Some(Edition::Edition2015),
-        ..LangString::all_false()
+        ..Default::default()
     });
     t(LangString {
         original: "edition2018".into(),
         edition: Some(Edition::Edition2018),
-        ..LangString::all_false()
+        ..Default::default()
     });
 }