From 96a5f7c8edac4bb2f50bdfe31c1287207d90d29b Mon Sep 17 00:00:00 2001
From: Pavel Verigo <paul.verigo@gmail.com>
Date: Sun, 28 Jan 2024 17:15:33 +0100
Subject: Sema: fix casting runtime value to enum with comptime int tag type

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

(limited to 'src/Sema.zig')

diff --git a/src/Sema.zig b/src/Sema.zig
index e52a795314..af3e3700d7 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -8657,6 +8657,12 @@ fn zirEnumFromInt(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError
         return Air.internedToRef((try mod.getCoerced(int_val, dest_ty)).toIntern());
     }
 
+    if (dest_ty.intTagType(mod).zigTypeTag(mod) == .ComptimeInt) {
+        return sema.failWithNeededComptime(block, operand_src, .{
+            .needed_comptime_reason = "value being casted to enum with 'comptime_int' tag type must be comptime-known",
+        });
+    }
+
     if (try sema.typeHasOnePossibleValue(dest_ty)) |opv| {
         const result = Air.internedToRef(opv.toIntern());
         // The operand is runtime-known but the result is comptime-known. In
-- 
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