The ‘_‘ wildcard handles exactly not specific cases but all nut specified.
non-exhaustive match would be to panic the thread if nothing is matched, though
it could fall through if the type of the `match` expression is `()`. This sort
of hidden cost and special casing is against the language's philosophy. It's
non-exhaustive match would be to panic the thread if nothing is matched, though
it could fall through if the type of the `match` expression is `()`. This sort
of hidden cost and special casing is against the language's philosophy. It's
-easy to ignore certain cases by using the `_` wildcard:
+easy to ignore all unspecified cases by using the `_` wildcard:
```rust,ignore
match val.do_something() {
```rust,ignore
match val.do_something() {