add space either side of / in unchecked_dirty_clean.rs test

Author: Samy Kacimi

src/librustc_incremental/persist/dirty_clean.rs

@@ -610,7 +610,7 @@ impl FindAllAttrs<'tcx> {
         for attr in &self.found_attrs {
             if !checked_attrs.contains(&attr.id) {
                 self.tcx.sess.span_err(attr.span, &format!("found unchecked \
-                    #[rustc_dirty]/#[rustc_clean] attribute"));
+                    `#[rustc_dirty]` / `#[rustc_clean]` attribute"));
             }
         }
     }

src/test/incremental/unchecked_dirty_clean.rs

@@ -11,24 +11,24 @@
 fn main() {
 
     #[rustc_dirty(label="Hir", cfg="cfail2")]
-    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]`/`#[rustc_clean]` attribute
+    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]` / `#[rustc_clean]` attribute
     {
         // empty block
     }
 
     #[rustc_clean(label="Hir", cfg="cfail2")]
-    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]`/`#[rustc_clean]` attribute
+    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]` / `#[rustc_clean]` attribute
     {
         // empty block
     }
 }
 
 struct _Struct {
     #[rustc_dirty(label="Hir", cfg="cfail2")]
-    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]`/`#[rustc_clean]` attribute
+    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]` / `#[rustc_clean]` attribute
     _field1: i32,
 
     #[rustc_clean(label="Hir", cfg="cfail2")]
-    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]`/`#[rustc_clean]` attribute
+    //[cfail2]~^ ERROR found unchecked `#[rustc_dirty]` / `#[rustc_clean]` attribute
     _field2: i32,
 }