Yep; but a parameter is one of the special "safe" cases where the variable's lifetime is guaranteed to be shorter than the lifetime of its initializing expression. Other "safe" cases are catch-handler "parameters" (not that it makes much sense to catch a string_view) and for-loop "parameters" — i.e. `for (string_view sv : stuff())`. The most relevant of these cases by far is the case of plain old function parameters.

These are cases where the core language helps the programmer out, and basically makes a whole class of bugs — well, not impossible, but difficult to run into if you're not actually trying. There are other cases, e.g. `string_view sv = stuff();` as used in TFA, where the core language offers no help at all, but there's an easy solution available. ("Don't do that, then." Treat `string_view` as a "parameter-only type" and you'll never encounter that kind of problem.)

And then there's C++20 coroutine "parameters," where the core language pretty actively tries to trip you up. https://quuxplusone.github.io/blog/2019/07/10/ways-to-get-da...