THRIFT-4529: Rust enum variants are now camel-cased

Client: rs
diff --git a/lib/rs/test/thrifts/Midlayer.thrift b/lib/rs/test/thrifts/Midlayer.thrift
index cf1157c..16ff49b 100644
--- a/lib/rs/test/thrifts/Midlayer.thrift
+++ b/lib/rs/test/thrifts/Midlayer.thrift
@@ -46,6 +46,15 @@
   [6, 7, 8]
 ]
 
+enum Pie {
+  PUMPKIN,
+  apple, // intentionally poorly cased
+  STRAWBERRY_RHUBARB,
+  Key_Lime, // intentionally poorly cased
+  coconut_Cream, // intentionally poorly cased
+  mississippi_mud, // intentionally poorly cased
+}
+
 struct Meal {
   1: Base_One.Noodle noodle
   2: Base_Two.Ramen ramen