Give some more queries descriptions

Author: matthewjasper

src/librustc/query/mod.rs

@@ -125,7 +125,9 @@ rustc_queries! {
 
         /// Fetch the MIR for a given `DefId` right after it's built - this includes
         /// unreachable code.
-        query mir_built(_: DefId) -> &'tcx Steal<mir::BodyAndCache<'tcx>> {}
+        query mir_built(_: DefId) -> &'tcx Steal<mir::BodyAndCache<'tcx>> {
+            desc { "building MIR for" }
+        }
 
         /// Fetch the MIR for a given `DefId` up till the point where it is
         /// ready for const evaluation.
@@ -345,6 +347,7 @@ rustc_queries! {
     TypeChecking {
         /// The result of unsafety-checking this `DefId`.
         query unsafety_check_result(key: DefId) -> mir::UnsafetyCheckResult {
+            desc { |tcx| "unsafety-checking `{}`", tcx.def_path_str(key) }
             cache_on_disk_if { key.is_local() }
         }
 
@@ -414,6 +417,7 @@ rustc_queries! {
         }
 
         query typeck_tables_of(key: DefId) -> &'tcx ty::TypeckTables<'tcx> {
+            desc { |tcx| "type-checking `{}`", tcx.def_path_str(key) }
             cache_on_disk_if { key.is_local() }
             load_cached(tcx, id) {
                 let typeck_tables: Option<ty::TypeckTables<'tcx>> = tcx
@@ -453,6 +457,7 @@ rustc_queries! {
         /// Borrow-checks the function body. If this is a closure, returns
         /// additional requirements that the closure's creator must verify.
         query mir_borrowck(key: DefId) -> mir::BorrowCheckResult<'tcx> {
+            desc { |tcx| "borrow-checking `{}`", tcx.def_path_str(key) }
             cache_on_disk_if(tcx, _) { key.is_local() && tcx.is_closure(key) }
         }
     }