add tests with type_punctuation_density set to Compressed and a list of types spanning multiple lines

Author: scampi

tests/source/types_compressed.rs

@@ -0,0 +1,7 @@
+// rustfmt-type_punctuation_density: Compressed
+
+pub fn do_something<'a, T: Trait1 + Trait2 + 'a>(
+    &fooo: u32,
+) -> impl Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + Foo + 'a + 'a + 'a + 'a + 'a
+ {
+}

tests/target/types_compressed.rs

@@ -0,0 +1,44 @@
+// rustfmt-type_punctuation_density: Compressed
+
+pub fn do_something<'a, T: Trait1+Trait2+'a>(
+    &fooo: u32,
+) -> impl Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +Foo
+         +'a+'a+'a+'a+'a {
+}