Update Rust documentation (1.50.0)

lib/docs/filters/rust/clean_html.rb

@@ -63,6 +63,11 @@ module Docs
         end
 
         css('> .impl-items', '> .docblock', 'pre > pre', '.tooltiptext', '.tooltip').each do |node|
+          # see .tooltip.ignore::after in https://doc.rust-lang.org/rustdoc1.50.0.css
+          node.content += ' This example is not tested' if node['class'].include?('ignore')
+          node.content += ' This example deliberately fails to compile' if node['class'].include?('compile_fail')
+          node.content += ' This example panics' if node['class'].include?('should_panic')
+          node.content += ' This code runs with edition ' + node['data-edition'] if node['class'].include?('edition')
           node.before(node.children).remove
         end
 

lib/docs/scrapers/rust.rb

@@ -3,7 +3,7 @@
 module Docs
   class Rust < UrlScraper
     self.type = 'rust'
-    self.release = '1.49.0'
+    self.release = '1.50.0'
     self.base_url = 'https://doc.rust-lang.org/'
     self.root_path = 'book/index.html'
     self.initial_paths = %w(