From fd674d95bee4815783bb282c80ba6af369296706 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sun, 7 May 2023 22:46:59 -0700
Subject: [PATCH] InternPool: add indexToKey for empty struct types

---
 src/InternPool.zig | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/InternPool.zig b/src/InternPool.zig
index 4f2e792a4968648c526f30e6acf2d1b677e63741..a49b98bd50de498c0bb8699feec0407f5de19a6e 100644
--- a/src/InternPool.zig
+++ b/src/InternPool.zig
@@ -59,10 +59,8 @@ pub const Key = union(enum) {
         ty: Index,
         tag: BigIntConst,
     },
-    struct_type: struct {
-        fields_len: u32,
-        // TODO move Module.Struct data to InternPool
-    },
+    struct_type: StructType,
+
     union_type: struct {
         fields_len: u32,
         // TODO move Module.Union data to InternPool
@@ -111,6 +109,11 @@ pub const Key = union(enum) {
         child: Index,
     };
 
+    pub const StructType = struct {
+        fields_len: u32,
+        // TODO move Module.Struct data to InternPool
+    };
+
     pub const Int = struct {
         ty: Index,
         storage: Storage,
@@ -1058,7 +1061,11 @@ pub fn indexToKey(ip: InternPool, index: Index) Key {
 
         .type_error_union => @panic("TODO"),
         .type_enum_simple => @panic("TODO"),
-        .simple_internal => @panic("TODO"),
+        .simple_internal => switch (@intToEnum(SimpleInternal, data)) {
+            .type_empty_struct => .{ .struct_type = .{
+                .fields_len = 0,
+            } },
+        },
         .int_u8 => .{ .int = .{
             .ty = .u8_type,
             .storage = .{ .u64 = data },
-- 
2.54.0