Model call chains as an AbstractTokenTarget

fixtures/small/heredocs_actual.rb

@@ -68,6 +68,19 @@ class Foo
   rubocop.smash(bad_thing)
 end
 
+this_one_is
+  .in_a_call_chain {
+    # some stuff
+  }
+  .each do
+    <<~MYHEREDOC
+    Words are pale shadows of forgotten names.
+    As names have power, words have power.
+    Words can light fires in the minds of men.
+    Words can wring tears from the hardest hearts.
+    MYHEREDOC
+  end
+
 
 puts a
 puts b

fixtures/small/heredocs_expected.rb

@@ -69,6 +69,19 @@ class Foo
   rubocop.smash(bad_thing)
 end
 
+this_one_is
+  .in_a_call_chain {
+    # some stuff
+  }
+  .each do
+    <<~MYHEREDOC
+      Words are pale shadows of forgotten names.
+      As names have power, words have power.
+      Words can light fires in the minds of men.
+      Words can wring tears from the hardest hearts.
+    MYHEREDOC
+  end
+
 puts(a)
 puts(b)
 foo

librubyfmt/src/render_queue_writer.rs

@@ -71,9 +71,17 @@ impl RenderQueueWriter {
                         .map(|k| k.is_squiggly())
                         .unwrap_or(false)
                     {
-                        let mut new_contents: String =
+                        let indent: String =
                             (0..(accum.additional_indent * 2)).map(|_| ' ').collect();
-                        new_contents.push_str(part.clone().as_str());
+                        let new_contents = part
+                            .split('\n')
+                            .map(|p| {
+                                let mut line = indent.clone();
+                                line.push_str(p);
+                                line
+                            })
+                            .collect::<Vec<String>>()
+                            .join("\n");
                         next_token = clats_direct_part(new_contents)
                     }
                 }