From 2b9af9e825fcbfd55f953e7c3bc80decb52a4b2b Mon Sep 17 00:00:00 2001
From: mlugg <mlugg@mlugg.co.uk>
Date: Sat, 31 Aug 2024 00:40:59 +0100
Subject: AstGen: error on unused switch label

---
 lib/std/zig/AstGen.zig | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib/std')

diff --git a/lib/std/zig/AstGen.zig b/lib/std/zig/AstGen.zig
index b280360535..aa1ea2498f 100644
--- a/lib/std/zig/AstGen.zig
+++ b/lib/std/zig/AstGen.zig
@@ -7999,6 +7999,11 @@ fn switchExpr(
             appendBodyWithFixupsArrayList(astgen, payloads, case_slice);
         }
     }
+
+    if (switch_full.label_token) |label_token| if (!block_scope.label.?.used) {
+        try astgen.appendErrorTok(label_token, "unused switch label", .{});
+    };
+
     // Now that the item expressions are generated we can add this.
     try parent_gz.instructions.append(gpa, switch_block);
 
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