Why would I ever want to find every reference to a loop or lambda variable with a given name in a file? Such variables repeat frequently with distinct meanings,

Why would I ever want to find every reference to a loop or lambda variable with a given name in a file? Such variables repeat frequently with distinct meanings, and each has a narrow scope. In any case, I wouldn't use an IDE that was so glitchy unless I was forced by necessity; I certainly wouldn't adopt a coping mechanism for it into other languages. Also, for a typical compiled language, deleting the declaration gives you all usages as long as you can (attempt to) build. Are there any other reasons? Edit: Is this advice perhaps intended to be specific to a particular context?