Hunt for the item in the container. Key and Test
are as in member.
| search-for-item < abstract-bag/set-container > < t > |
| search-for-item < bag/set-container > < t > |
| search-for-item < contents-as-array-mixin > < t > |
| search-for-item < contents-as-hashtable-mixin > < t > |
| search-for-item < contents-as-list-mixin > < t > |
| search-for-item < iteratable-container-mixin > < t > |
| search-for-item < list > < t > |
| search-for-item < stack-container > < t > |