compiler: error on unused imports

vlib/crypto/aes/aes.v

@@ -8,7 +8,6 @@
 module aes
 
 import (
-	crypto.cipher
 	crypto.internal.subtle
 )
 

vlib/crypto/aes/aes_cbc.v

@@ -31,7 +31,7 @@ fn _new_cbc(b AesCipher, iv []byte) AesCbc {
 		b:          b,
 		block_size: b.block_size(),
 		iv:         iv.clone(),
-		tmp:        [byte(0); b.block_size()],
+		tmp:        [byte(0)].repeat(b.block_size()),
 	}
 }
 

vlib/crypto/aes/cypher_generic.v

@@ -5,8 +5,8 @@
 module aes
 
 import (
-	crypto.cipher
-	crypto.internal.subtle
+	// crypto.cipher
+	// crypto.internal.subtle
 )
 
 // new_cipher_generic creates and returns a new cipher.Block