Switch some tuple structs to pub fields

This commit deals with the fallout of the previous change by making tuples
structs have public fields where necessary (now that the fields are private by
default).

src/librustdoc/html/format.rs

@@ -28,12 +28,12 @@ use html::render::{cache_key, current_location_key};
 
 /// Helper to render an optional visibility with a space after it (if the
 /// visibility is preset)
-pub struct VisSpace(Option<ast::Visibility>);
+pub struct VisSpace(pub Option<ast::Visibility>);
 /// Similarly to VisSpace, this structure is used to render a purity with a
 /// space after it.
-pub struct PuritySpace(ast::Purity);
+pub struct PuritySpace(pub ast::Purity);
 /// Wrapper struct for properly emitting a method declaration.
-pub struct Method<'a>(&'a clean::SelfTy, &'a clean::FnDecl);
+pub struct Method<'a>(pub &'a clean::SelfTy, pub &'a clean::FnDecl);
 
 impl VisSpace {
     pub fn get(&self) -> Option<ast::Visibility> {