From b6133931d04afc6980dfff2e87dadc85922d5335 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Thu, 31 Mar 2022 12:25:48 -0700
Subject: [PATCH] Sema: fix segfault during resolveInferredErrorSet

There was a simple missing check of adding an inferred error set to
itself, in which case we should not try to mutate the hash map while
iterating over it.
---
 src/Sema.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Sema.zig b/src/Sema.zig
index 9f5d6d5f9e..6ab89af3f9 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -21549,6 +21549,7 @@ fn resolveInferredErrorSet(
     var it = ies.inferred_error_sets.keyIterator();
     while (it.next()) |other_error_set_ptr| {
         const other_ies: *Module.Fn.InferredErrorSet = other_error_set_ptr.*;
+        if (ies == other_ies) continue;
         try sema.resolveInferredErrorSet(block, src, other_ies);
 
         for (other_ies.errors.keys()) |key| {