Rollup merge of #44397 - GuillaumeGomez:codeblock-color, r=QuietMisdreavus

Codeblock color

<img width="1440" alt="screen shot 2017-09-07 at 21 53 58" src="https://user-images.githubusercontent.com/3050060/30183045-4319108e-9419-11e7-98da-da54952cab37.png">

This screenshot has been generated from:

```rust
/// foo
///
/// ```compile_fail
/// foo();
/// ```
///
/// ```ignore
/// goo();
/// ```
///
/// ```
/// let x = 0;
/// ```
pub fn bar() -> usize { 2 }
```

r? @QuietMisdreavus
cc @rust-lang/docs

src/librustdoc/html/render.rs

@@ -1819,6 +1819,7 @@ fn render_assoc_const_value(item: &clean::Item) -> String {
                 None,
                 None,
                 None,
+                None,
             )
         }
         _ => String::new(),
@@ -3647,7 +3648,8 @@ impl<'a> fmt::Display for Source<'a> {
             write!(fmt, "<span id=\"{0}\">{0:1$}</span>\n", i, cols)?;
         }
         write!(fmt, "</pre>")?;
-        write!(fmt, "{}", highlight::render_with_highlighting(s, None, None, None))?;
+        write!(fmt, "{}",
+               highlight::render_with_highlighting(s, None, None, None, None))?;
         Ok(())
     }
 }
@@ -3657,6 +3659,7 @@ fn item_macro(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
     w.write_str(&highlight::render_with_highlighting(&t.source,
                                                      Some("macro"),
                                                      None,
+                                                     None,
                                                      None))?;
     document(w, cx, it)
 }