Adds error return trace printing to stage1.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/stage1.zig b/src/stage1.zig
index a989ad4be3..10b85899c2 100644
--- a/src/stage1.zig
+++ b/src/stage1.zig
@@ -39,7 +39,12 @@ pub export fn main(argc: c_int, argv: [*]const [*:0]const u8) c_int {
     for (args) |*arg, i| {
         arg.* = mem.spanZ(argv[i]);
     }
-    stage2.mainArgs(gpa, arena, args) catch |err| fatal("{}", .{@errorName(err)});
+    stage2.mainArgs(gpa, arena, args) catch |err| {
+        if (@errorReturnTrace()) |trace| {
+            std.debug.dumpStackTrace(trace.*);
+        }
+        fatal("unhandled internal error: {}", .{@errorName(err)});
+    };
     return 0;
 }