Not too lean too heavily on the crutch of tooling, but it bothers me that this type of error can "slip through the cracks". Our tooling should make it patently obvious that this is a problem (before the code can be tested) if not automatically fixing it.

Indeed many tools (IDEs) do correct these kinds of problems, and it strikes me as silly that we have to worry about the execution of programs failing because of these types of typos/bugs.