From 1d808d0dd20326dbdb0478f2a2f43f0b9ebb557a Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 17 May 2021 19:11:11 -0700
Subject: stage2: fix crash in switch compile error

when the AST for the switch has never been loaded
---
 src/Module.zig | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/Module.zig')

diff --git a/src/Module.zig b/src/Module.zig
index e659f4ed47..39caa24d75 100644
--- a/src/Module.zig
+++ b/src/Module.zig
@@ -4419,13 +4419,20 @@ pub const SwitchProngSrc = union(enum) {
     /// the LazySrcLoc in order to emit a compile error.
     pub fn resolve(
         prong_src: SwitchProngSrc,
+        gpa: *Allocator,
         decl: *Decl,
         switch_node_offset: i32,
         range_expand: RangeExpand,
     ) LazySrcLoc {
         @setCold(true);
+        const tree = decl.namespace.file_scope.getTree(gpa) catch |err| {
+            // In this case we emit a warning + a less precise source location.
+            log.warn("unable to load {s}: {s}", .{
+                decl.namespace.file_scope.sub_file_path, @errorName(err),
+            });
+            return LazySrcLoc{ .node_offset = 0};
+        };
         const switch_node = decl.relativeToNodeIndex(switch_node_offset);
-        const tree = decl.namespace.file_scope.tree;
         const main_tokens = tree.nodes.items(.main_token);
         const node_datas = tree.nodes.items(.data);
         const node_tags = tree.nodes.items(.tag);
-- 
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