From 8ec4c5cb137d9a93c35df3488408c44056c586b4 Mon Sep 17 00:00:00 2001
From: Matthew Lugg <mlugg@mlugg.co.uk>
Date: Sun, 11 Jan 2026 11:36:51 +0000
Subject: [PATCH] Sema: evaluate switch items at comptime

---
 src/Sema.zig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Sema.zig b/src/Sema.zig
index 29c5c14702f6d3176a3b8de8e3cf694b4f59e887..204d4a736c1001c40abfd452ffa0b8040c589270 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -13210,6 +13210,12 @@ fn resolveSwitchItem(
                 // The result location of item bodies is `.{ .coerce_ty = switch_inst }`.
                 sema.inst_map.putAssumeCapacity(switch_inst, .fromType(item_ty));
                 defer assert(sema.inst_map.remove(switch_inst));
+                const old_comptime_reason = block.comptime_reason;
+                defer block.comptime_reason = old_comptime_reason;
+                block.comptime_reason = .{ .reason = .{
+                    .src = item_src,
+                    .r = .{ .simple = .switch_item },
+                } };
                 break :ref try sema.resolveInlineBody(block, body, switch_inst);
             };
             break :uncoerced .{ uncoerced, sema.typeOf(uncoerced) };
-- 
2.54.0