From e32898b0dedf1da13798f798d2825113b0be748b Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 7 Apr 2021 12:59:50 -0700
Subject: [PATCH] AstGen: fix switch expressions with all prongs noreturn

---
 src/AstGen.zig | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/AstGen.zig b/src/AstGen.zig
index d6c2eea5a3..6149169c7f 100644
--- a/src/AstGen.zig
+++ b/src/AstGen.zig
@@ -3356,8 +3356,13 @@ fn switchExpr(
     switch (strat.tag) {
         .break_operand => {
             // Switch expressions return `true` for `nodeMayNeedMemoryLocation` thus
-            // this is always true.
-            assert(strat.elide_store_to_block_ptr_instructions);
+            // `elide_store_to_block_ptr_instructions` will either be true,
+            // or all prongs are noreturn.
+            if (!strat.elide_store_to_block_ptr_instructions) {
+                astgen.extra.appendSliceAssumeCapacity(scalar_cases_payload.items);
+                astgen.extra.appendSliceAssumeCapacity(multi_cases_payload.items);
+                return astgen.indexToRef(switch_block);
+            }
 
             // There will necessarily be a store_to_block_ptr for
             // all prongs, except for prongs that ended with a noreturn instruction.