From 7e781925e1cdf9067cde61fcfdeaf912daaa6c31 Mon Sep 17 00:00:00 2001
From: Konrad Borowski <konrad@borowski.pw>
Date: Tue, 17 Jan 2023 08:43:58 +0100
Subject: [PATCH] Allow storing V with #[derive(Enum)]

enum-map reserves __EnumMapInternalV for this purpose. This
is not a part of stable API, and it's only necessary due
to not having stable def_site hygiene.
---
 enum-map-derive/src/derive_enum.rs   | 2 +-
 enum-map-derive/src/derive_struct.rs | 2 +-
 enum-map/tests/test.rs               | 9 +++++++++
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/enum-map-derive/src/derive_enum.rs b/enum-map-derive/src/derive_enum.rs
index be49fc1..40cf5ae 100644
--- a/enum-map-derive/src/derive_enum.rs
+++ b/enum-map-derive/src/derive_enum.rs
@@ -37,7 +37,7 @@ impl EnumGenerator {
         quote! {
             #[automatically_derived]
             impl ::enum_map::Enum for #name {
-                type Array<V> = [V; #length];
+                type Array<__EnumMapInternalV> = [__EnumMapInternalV; #length];
 
                 #[inline]
                 fn from_usize(value: ::enum_map::usize) -> Self {
diff --git a/enum-map-derive/src/derive_struct.rs b/enum-map-derive/src/derive_struct.rs
index fc13a7a..85468e6 100644
--- a/enum-map-derive/src/derive_struct.rs
+++ b/enum-map-derive/src/derive_struct.rs
@@ -102,7 +102,7 @@ impl StructGenerator {
         quote! {
             #[automatically_derived]
             impl ::enum_map::Enum for #name {
-                type Array<V> = [V; #length];
+                type Array<__EnumMapInternalV> = [__EnumMapInternalV; #length];
 
                 #[inline]
                 fn from_usize(value: ::enum_map::usize) -> Self {
diff --git a/enum-map/tests/test.rs b/enum-map/tests/test.rs
index 6e3e5eb..b1d85b5 100644
--- a/enum-map/tests/test.rs
+++ b/enum-map/tests/test.rs
@@ -639,3 +639,12 @@ fn usize_override() {
         B,
     }
 }
+
+#[derive(Enum)]
+enum V {
+    V,
+}
+#[derive(Enum)]
+struct StructureCanHoldV {
+    v: V,
+}