rustdoc: Fix tuple struct where clause rendering

For tuple structs the where clause comes after the definition.

src/librustdoc/html/render.rs

@@ -2409,10 +2409,13 @@ fn render_struct(w: &mut fmt::Formatter, it: &clean::Item,
            if structhead {"struct "} else {""},
            it.name.as_ref().unwrap())?;
     if let Some(g) = g {
-        write!(w, "{}{}", *g, WhereClause(g))?
+        write!(w, "{}", g)?
     }
     match ty {
         doctree::Plain => {
+            if let Some(g) = g {
+                write!(w, "{}", WhereClause(g))?
+            }
             write!(w, " {{\n{}", tab)?;
             for field in fields {
                 if let clean::StructFieldItem(ref ty) = field.inner {
@@ -2445,9 +2448,17 @@ fn render_struct(w: &mut fmt::Formatter, it: &clean::Item,
                     _ => unreachable!()
                 }
             }
-            write!(w, ");")?;
+            write!(w, ")")?;
+            if let Some(g) = g {
+                write!(w, "{}", WhereClause(g))?
+            }
+            write!(w, ";")?;
         }
         doctree::Unit => {
+            // Needed for PhantomData.
+            if let Some(g) = g {
+                write!(w, "{}", WhereClause(g))?
+            }
             write!(w, ";")?;
         }
     }

src/test/rustdoc/issue-34928.rs

@@ -0,0 +1,16 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![crate_name = "foo"]
+
+pub trait Bar {}
+
+// @has foo/struct.Foo.html '//pre' 'pub struct Foo<T>(pub T) where T: Bar;'
+pub struct Foo<T>(pub T) where T: Bar;

src/test/rustdoc/where.rs

@@ -12,7 +12,7 @@
 
 pub trait MyTrait { fn dummy(&self) { } }
 
-// @has foo/struct.Alpha.html '//pre' "pub struct Alpha<A> where A: MyTrait"
+// @has foo/struct.Alpha.html '//pre' "pub struct Alpha<A>(_) where A: MyTrait"
 pub struct Alpha<A>(A) where A: MyTrait;
 // @has foo/trait.Bravo.html '//pre' "pub trait Bravo<B> where B: MyTrait"
 pub trait Bravo<B> where B: MyTrait { fn get(&self, B: B); }