normalize use of backticks in compiler messages for librustc_incremental

src/librustc_incremental/assert_dep_graph.rs

@@ -190,7 +190,7 @@ fn check_paths<'tcx>(tcx: TyCtxt<'tcx>, if_this_changed: &Sources, then_this_wou
         for &(target_span, _, _, _) in then_this_would_need {
             tcx.sess.span_err(
                 target_span,
-                "no #[rustc_if_this_changed] annotation detected");
+                "no `#[rustc_if_this_changed]` annotation detected");
 
         }
         return;

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/librustc_incremental/persist/fs.rs

@@ -538,7 +538,7 @@ fn find_source_directory_in_iter<I>(iter: I,
         if source_directories_already_tried.contains(&session_dir) ||
            !is_session_directory(&directory_name) ||
            !is_finalized(&directory_name) {
-            debug!("find_source_directory_in_iter - ignoring.");
+            debug!("find_source_directory_in_iter - ignoring");
             continue
         }
 
@@ -693,7 +693,7 @@ pub fn garbage_collect_session_directories(sess: &Session) -> io::Result<()> {
             let timestamp = match extract_timestamp_from_session_dir(lock_file_name) {
                 Ok(timestamp) => timestamp,
                 Err(()) => {
-                    debug!("Found lock-file with malformed timestamp: {}",
+                    debug!("found lock-file with malformed timestamp: {}",
                         crate_directory.join(&lock_file_name).display());
                     // Ignore it
                     continue
@@ -746,7 +746,7 @@ pub fn garbage_collect_session_directories(sess: &Session) -> io::Result<()> {
         let timestamp = match extract_timestamp_from_session_dir(directory_name) {
             Ok(timestamp) => timestamp,
             Err(()) => {
-                debug!("Found session-dir with malformed timestamp: {}",
+                debug!("found session-dir with malformed timestamp: {}",
                         crate_directory.join(directory_name).display());
                 // Ignore it
                 continue

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,
 }