diff --git a/src/metadata/consts.rs b/src/metadata/consts.rs
index 4932971..bbdbc31 100644
--- a/src/metadata/consts.rs
+++ b/src/metadata/consts.rs
@@ -1,39 +1,39 @@
-#[allow(dead_code)]
+#![allow(dead_code)]
 /// database, table or column charset
 pub const METADATA_CHARSET: &str = "charset";
-#[allow(dead_code)]
+
 /// database, table or column collation
 pub const METADATA_COLLATION: &str = "collation";
-#[allow(dead_code)]
+
 /// constraint action ON UPDATE or TIMESTAMP internal update
 pub const METADATA_ON_UPDATE: &str = "on_update";
-#[allow(dead_code)]
+
 /// constraint action ON DELETE
 pub const METADATA_ON_DELETE: &str = "on_delete";
-#[allow(dead_code)]
+
 /// constraint action value CASCADE
 pub const METADATA_CASCADE: &str = "cascade";
-#[allow(dead_code)]
+
 /// constraint action value SET NULL
 pub const METADATA_SET_NULL: &str = "set_null";
 
-#[allow(dead_code)]
+
 /// for numerical datatypes of columns
 pub const METADATA_FLAG_UNSIGNED: &str = "unsigned";
-#[allow(dead_code)]
+
 /// for nullable columns
 pub const METADATA_FLAG_NULLABLE: &str = "nullable";
-#[allow(dead_code)]
+
 /// for marking primary keys
 pub const METADATA_FLAG_PRIMARY: &str = "primary";
 /// for marking unique indexes
 pub const METADATA_FLAG_UNIQUE: &str = "unique";
-#[allow(dead_code)]
+
 /// primary key columns are usually AUTO INCREMENT
 pub const METADATA_FLAG_AUTO_INCREMENT: &str = "auto_increment";
-#[allow(dead_code)]
+
 /// TIMESTAMP DEFAULT
 pub const METADATA_FLAG_DEFAULT_CURRENT_TIMESTAMP: &str = "current_timestamp()";
-#[allow(dead_code)]
+
 /// TIMESTAMP ON UPDATE trigger
 pub const METADATA_FLAG_ON_UPDATE_CURRENT_TIMESTAMP: &str = "on update current_timestamp()";