From 3267eb3a28f6c747772a40beedac14f5feae814f Mon Sep 17 00:00:00 2001
From: IntegratedQuantum <jahe788@gmail.com>
Date: Mon, 19 Jun 2023 21:39:35 +0200
Subject: [PATCH] Fix @enumToInt and @tagName for auto-numbered enums with
 signed tag type.

---
 src/InternPool.zig     | 6 +++++-
 test/behavior/enum.zig | 5 +++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/InternPool.zig b/src/InternPool.zig
index 221b56b88affc07c5a17ee3531aec7634d06747c..a385702c439d57819ca7f3c7216e79350a306e31 100644
--- a/src/InternPool.zig
+++ b/src/InternPool.zig
@@ -448,7 +448,11 @@ pub const Key = union(enum) {
                     if (x >= self.names.len) return null;
                     return @intCast(u32, x);
                 },
-                .i64, .big_int => return null, // out of range
+                .i64 => |x| {
+                    if (x >= self.names.len or x < 0) return null;
+                    return @intCast(u32, x);
+                },
+                .big_int => return null, // out of range
                 .lazy_align, .lazy_size => unreachable,
             }
         }
diff --git a/test/behavior/enum.zig b/test/behavior/enum.zig
index 12926800e307686724dea309b8910652eff31720..4280a954dce881f59dde96e5969be41604bae33d 100644
--- a/test/behavior/enum.zig
+++ b/test/behavior/enum.zig
@@ -812,6 +812,11 @@ test "signed integer as enum tag" {
     try expect(@intFromEnum(SignedEnum.A2) == 1);
 }
 
+test "int to enum with signed tag type" {
+    const E = enum(i32) { a, b, c };
+    try expect(@intToEnum(E, 0) == .a);
+}
+
 test "enum with one member and custom tag type" {
     const E = enum(u2) {
         One,
-- 
2.54.0