From a4c5ec49f1781054ef9394fe114e4338ed9970d4 Mon Sep 17 00:00:00 2001
From: Veikka Tuominen <git@vexu.eu>
Date: Fri, 25 Mar 2022 11:51:40 +0200
Subject: [PATCH] Sema: add error for empty switch

---
 src/Sema.zig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Sema.zig b/src/Sema.zig
index a42a4caf38..d9eea3e811 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -7743,6 +7743,9 @@ fn zirSwitchBlock(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError
     }
 
     if (scalar_cases_len + multi_cases_len == 0) {
+        if (special_prong == .none) {
+            return sema.fail(block, src, "switch must handle all possibilities", .{});
+        }
         return sema.resolveBlockBody(block, src, &child_block, special.body, inst, merges);
     }