Fatal Crash/Panic in map/ordered_map.rs:225

[KieranP]

Describe the bug

The application panicked (crashed).
Message:  Object already borrowed: BorrowMutError
Location: core/engine/src/builtins/map/ordered_map.rs:225
The application panicked (crashed).
Message:  Object already borrowed: BorrowMutError
Location: core/engine/src/builtins/map/ordered_map.rs:225
The application panicked (crashed).
Message:  panic in a destructor during cleanup
Location: library/core/src/panicking.rs:233
thread caused non-unwinding panic. aborting.
zsh: abort      boa -m play.js

To Reproduce

(assuming git and typescript are installed)

git clone https://github.com/KieranP/Game-Of-Life-Implementations.git
cd typescript
tsc
boa -m play.js

Expected behavior

No crash

Build environment (please complete the following information):

• OS: macOS 26.0.1
• Boa Version: 0.21.0
• Target triple: (used precompiled binary from homebrew)
• Rustc version: (used precompiled binary from homebrew)

[KieranP]

Can confirm the same issue happens on the latest main commit. With 0.21.0 release, it consistently fails during tick 400. On main, it consistently fails on tick 848.