tests: add cases for type alias issues

tests/source/issue_4823.rs

@@ -0,0 +1,5 @@
+macro_rules! m {
+() => {
+type Type;
+};
+}

tests/source/issue_5027.rs

@@ -0,0 +1,7 @@
+// rustfmt-version: Two
+
+pub type Iter<'a, D> =                 impl       DoubleEndedIterator<Item = (SomethingSomethingSomethingLongType<D>)>+ ExactSizeIterator+ 'a;
+
+trait FOo {pub type Iter<'a, D> = impl        DoubleEndedIterator<Item = (SomethingSomethingSomethingLongType<D>)>+ ExactSizeIterator+ 'a;}
+
+impl Bar {pub type Iter<'a, D> = impl             DoubleEndedIterator<Item = (SomethingSomethingSomethingLongType<D>)>+ ExactSizeIterator+ 'a;}

tests/source/issue_5086.rs

@@ -0,0 +1,2 @@
+#[cfg(any())]
+    type   Type :   Bound ;