feat: register trace.Elab

src/Init/Lean/Elab/Util.lean

@@ -4,6 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Leonardo de Moura
 -/
 prelude
+import Init.Lean.Util.Trace
 import Init.Lean.Parser
 
 namespace Lean
@@ -65,5 +66,8 @@ do ext : PersistentEnvExtension ElabAttributeEntry σ ← registerPersistentEnvE
    };
    pure { ext := ext, attr := attrImpl, kind := kind }
 
+@[init] private def regTraceClasses : IO Unit :=
+registerTraceClass `Elab
+
 end Elab
 end Lean