remove unreachable!() (#3646)

Author: rchaser53

src/imports.rs

@@ -451,11 +451,10 @@ impl UseTree {
         // Normalise foo::self as bar -> foo as bar.
         if let UseSegment::Slf(_) = last {
             match self.path.last() {
-                None => {}
                 Some(UseSegment::Ident(_, None)) => {
                     aliased_self = true;
                 }
-                _ => unreachable!(),
+                _ => {}
             }
         }
 

tests/target/issue-3645.rs

@@ -0,0 +1,3 @@
+mod x {
+    use super::self as x;
+}