Format enums. Fix #120.

test/splitting/enums.unit

Index: test/splitting/enums.unit
diff --git a/test/splitting/enums.unit b/test/splitting/enums.unit
new file mode 100644
index 0000000000000000000000000000000000000000..d326e40a233a850c90ed59ee44f7f48da31a0cbf
--- /dev/null
+++ b/test/splitting/enums.unit
@@ -0,0 +1,19 @@
+40 columns                              |
+>>> multiple lines
+enum Primate{BONOBO,CHIMP,GORILLA,ORANGUTAN}
+<<<
+enum Primate {
+  BONOBO,
+  CHIMP,
+  GORILLA,
+  ORANGUTAN
+}
+>>> multiple lines trailing comma
+enum Primate{BONOBO,CHIMP,GORILLA,ORANGUTAN,}
+<<<
+enum Primate {
+  BONOBO,
+  CHIMP,
+  GORILLA,
+  ORANGUTAN,
+}