From 561565fa81e4107f50b8cbdcc00ec0fa2ee4de15 Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Sun, 13 Dec 2020 20:27:04 +0100
Subject: stage1: Fix crash in can_mutate_comptime_var_state

No lazy value can mutate global state, no need to resolve them.

Closes #7426
---
 src/stage1/analyze.cpp | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/stage1/analyze.cpp')

diff --git a/src/stage1/analyze.cpp b/src/stage1/analyze.cpp
index ed0a033592..35405518eb 100644
--- a/src/stage1/analyze.cpp
+++ b/src/stage1/analyze.cpp
@@ -5749,6 +5749,28 @@ static bool can_mutate_comptime_var_state(ZigValue *value) {
     assert(value != nullptr);
     if (value->special == ConstValSpecialUndef)
         return false;
+
+    if (value->special == ConstValSpecialLazy) {
+        // No lazy value has side effects.
+        // Use a switch here to get a compile error whenever a new kind of lazy
+        // value is added.
+        switch (value->data.x_lazy->id) {
+            case LazyValueIdInvalid:
+                zig_unreachable();
+
+            case LazyValueIdAlignOf:
+            case LazyValueIdSizeOf:
+            case LazyValueIdPtrType:
+            case LazyValueIdOptType:
+            case LazyValueIdSliceType:
+            case LazyValueIdFnType:
+            case LazyValueIdErrUnionType:
+            case LazyValueIdArrayType:
+            case LazyValueIdTypeInfoDecls:
+                return false;
+        }
+    }
+
     switch (value->type->id) {
         case ZigTypeIdInvalid:
             zig_unreachable();
-- 
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