From 2cef4367013586eb0133f7ce7f37293711096bd0 Mon Sep 17 00:00:00 2001
From: "Leon Yang (Containers)" <lnyng@fb.com>
Date: Wed, 1 Jun 2022 18:11:08 -0700
Subject: [PATCH] Fix Queriable for empty enum

Summary:
Turns out that reference to empty enum is consider inhabited: https://github.com/rust-lang/rust/pull/80651

Fix by adding a unreachable clause.

Differential Revision: D36850027

fbshipit-source-id: cc338becc4ebd57c33441c2d8575b07c3052229e
---
 below/below_derive/src/qenum.rs     | 1 +
 below/below_derive/src/queriable.rs | 1 +
 2 files changed, 2 insertions(+)

diff --git a/below/below_derive/src/qenum.rs b/below/below_derive/src/qenum.rs
index 4f428809..ae302016 100644
--- a/below/below_derive/src/qenum.rs
+++ b/below/below_derive/src/qenum.rs
@@ -77,6 +77,7 @@ pub fn enum_to_string_derive_impl(ast: &DeriveInput) -> syn::Result<TokenStream>
             fn to_string(&self) -> ::std::string::String {
                 match self {
                     #(#variant_to_string_arms)*
+                    _ => unreachable!(),
                 }
             }
         }
diff --git a/below/below_derive/src/queriable.rs b/below/below_derive/src/queriable.rs
index 99a6cf41..b18bbb62 100644
--- a/below/below_derive/src/queriable.rs
+++ b/below/below_derive/src/queriable.rs
@@ -266,6 +266,7 @@ pub fn queriable_derive_impl(ast: &DeriveInput) -> syn::Result<TokenStream> {
             fn query(&self, field_id: &Self::FieldId) -> ::std::option::Option<Field> {
                 match field_id {
                     #(#queriable_match_arms)*
+                    _ => unreachable!(),
                 }
             }
         }