eval: enable v interpret examples/hanoi.v

vlib/v/eval/expr.v

@@ -511,8 +511,13 @@ pub fn (mut e Eval) expr(expr ast.Expr, expecting ast.Type) Object {
 
 			return res
 		}
-		else {
-			e.error('unhandled expression $expr.type_name()')
+		ast.AnonFn, ast.ArrayDecompose, ast.AsCast, ast.Assoc, ast.AtExpr, ast.CTempVar,
+		ast.ChanInit, ast.Comment, ast.ComptimeCall, ast.ComptimeSelector, ast.ComptimeType,
+		ast.ConcatExpr, ast.DumpExpr, ast.EmptyExpr, ast.EnumVal, ast.GoExpr, ast.IfGuardExpr,
+		ast.IndexExpr, ast.IsRefType, ast.Likely, ast.LockExpr, ast.MapInit, ast.MatchExpr,
+		ast.NodeError, ast.None, ast.OffsetOf, ast.OrExpr, ast.RangeExpr, ast.SelectExpr,
+		ast.SqlExpr, ast.TypeNode, ast.TypeOf, ast.UnsafeExpr {
+			e.error('unhandled expression ${typeof(expr).name}')
 		}
 	}
 	return empty