Update Rust documentation (1.30.1)

Author: Thibaut

lib/docs/filters/rust/clean_html.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Docs
   class Rust
     class CleanHtmlFilter < Filter
@@ -74,10 +76,10 @@ def call
           node.remove
         end
 
-        css('h2 .important-traits', 'h3 .important-traits', 'h4 .important-traits').each do |node|
+        css('.important-traits').to_a.each_with_index do |node, index|
           content = node.at_css('.content.hidden .content')
           node.at_css('.content.hidden').replace(content) if content
-          node.parent.after(node)
+          node.parent.after(node) if node.parent.name.in?(%(h2 h3 h4))
         end
 
         css('code.content').each do |node|

lib/docs/filters/rust/entries.rb

@@ -43,13 +43,12 @@ def additional_entries
           end
         else
           css('.method')
-            .select {|node| !node.at_css('.fnname').nil?}
-            .map {|node|
-              name = node.at_css('.fnname').content
+            .each_with_object({}) { |node, entries|
+              name = node.at_css('.fnname').try(:content)
+              next unless name
               name.prepend "#{self.name}::"
-              [name, node['id']]
-            }
-            .uniq {|item| item[0]}
+              entries[name] ||= [name, node['id']]
+            }.values
         end
       end
     end

lib/docs/scrapers/rust.rb

@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 module Docs
   class Rust < UrlScraper
     self.type = 'rust'
-    self.release = '1.29.1'
+    self.release = '1.30.1'
     self.base_url = 'https://doc.rust-lang.org/'
     self.root_path = 'book/second-edition/index.html'
     self.initial_paths = %w(
@@ -28,6 +30,7 @@ class Rust < UrlScraper
     options[:fix_urls] = ->(url) do
       url.sub! %r{(#{Rust.base_url}.+/)\z}, '\1index.html'
       url.sub! '/unicode/u_str', '/unicode/str/'
+      url.sub! '/std/std/', '/std/'
       url
     end