rustdoc: where clause adjustment to fix tests

- add spaces to output so stripping lines and breaking spaces renders
  the same
- add commas to where clauses in rustdoc tests to match the new output

src/librustdoc/html/format.rs

@@ -192,9 +192,9 @@ impl<'a> fmt::Display for WhereClause<'a> {
             clause.push_str(" where");
         } else {
             if end_newline {
-                clause.push_str("<span class=\"where fmt-newline\">where");
+                clause.push_str(" <span class=\"where fmt-newline\">where");
             } else {
-                clause.push_str("<span class=\"where\">where");
+                clause.push_str(" <span class=\"where\">where");
             }
         }
         for (i, pred) in gens.where_predicates.iter().enumerate() {
@@ -241,8 +241,11 @@ impl<'a> fmt::Display for WhereClause<'a> {
             clause.push_str("</span>");
             let padding = repeat("&nbsp;").take(indent + 4).collect::<String>();
             clause = clause.replace("<br>", &format!("<br>{}", padding));
-            clause.insert_str(0, &repeat("&nbsp;").take(indent).collect::<String>());
+            clause.insert_str(0, &repeat("&nbsp;").take(indent.saturating_sub(1))
-            if !end_newline {
+                                                  .collect::<String>());
+            if end_newline {
+                clause.push(' ');
+            } else {
                 clause.insert_str(0, "<br>");
             }
         }

src/librustdoc/html/render.rs

@@ -2710,14 +2710,14 @@ fn render_struct(w: &mut fmt::Formatter, it: &clean::Item,
             }
             write!(w, ")")?;
             if let Some(g) = g {
-                write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: true })?
+                write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: false })?
             }
             write!(w, ";")?;
         }
         doctree::Unit => {
             // Needed for PhantomData.
             if let Some(g) = g {
-                write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: true })?
+                write!(w, "{}", WhereClause { gens: g, indent: 0, end_newline: false })?
             }
             write!(w, ";")?;
         }

src/test/rustdoc/impl-parts.rs

@@ -17,7 +17,7 @@ impl AnOibit for .. {}
 pub struct Foo<T> { field: T }
 
 // @has impl_parts/struct.Foo.html '//*[@class="impl"]//code' \
-//     "impl<T: Clone> !AnOibit for Foo<T> where T: Sync"
+//     "impl<T: Clone> !AnOibit for Foo<T> where T: Sync,"
 // @has impl_parts/trait.AnOibit.html '//*[@class="item-list"]//code' \
-//     "impl<T: Clone> !AnOibit for Foo<T> where T: Sync"
+//     "impl<T: Clone> !AnOibit for Foo<T> where T: Sync,"
 impl<T: Clone> !AnOibit for Foo<T> where T: Sync {}

src/test/rustdoc/issue-20727-4.rs

@@ -35,7 +35,7 @@ pub trait IndexMut<Idx: ?Sized>: Index<Idx> {
 
 pub mod reexport {
     // @has issue_20727_4/reexport/trait.Index.html
-    // @has - '//*[@class="rust trait"]' 'trait Index<Idx> where Idx: ?Sized {'
+    // @has - '//*[@class="rust trait"]' 'trait Index<Idx> where Idx: ?Sized, {'
     // @has - '//*[@class="rust trait"]' 'type Output: ?Sized'
     // @has - '//*[@class="rust trait"]' \
     //        'fn index(&self, index: Idx) -> &Self::Output'
@@ -43,7 +43,7 @@ pub mod reexport {
 
     // @has issue_20727_4/reexport/trait.IndexMut.html
     // @has - '//*[@class="rust trait"]' \
-    //        'trait IndexMut<Idx>: Index<Idx> where Idx: ?Sized {'
+    //        'trait IndexMut<Idx>: Index<Idx> where Idx: ?Sized, {'
     // @has - '//*[@class="rust trait"]' \
     //        'fn index_mut(&mut self, index: Idx) -> &mut Self::Output;'
     pub use issue_20727::IndexMut;

src/test/rustdoc/where.rs

@@ -44,5 +44,5 @@ pub enum Foxtrot<F> { Foxtrot1(F) }
 impl<F> MyTrait for Foxtrot<F> where F: MyTrait {}
 
 // @has foo/type.Golf.html '//pre[@class="rust typedef"]' \
-//          "type Golf<T> where T: Clone = (T, T)"
+//          "type Golf<T> where T: Clone, = (T, T)"
 pub type Golf<T> where T: Clone = (T, T);