Expand description
Silence the default panic-hook output for the VM’s longjmp-emulation unwinds.
Luau’s luaD_throw uses C++ exceptions for control flow; the faithful Rust
port (lua_d_throw) emulates this with std::panic::panic_any carrying a
lua_exception, caught at the [luaD_rawrunprotected] boundary
(VM/src/ldo.cpp). These are NOT crashes — they are the normal mechanism by
which an ordinary Lua runtime error (error(..), a failed assert, a type
error) propagates up to pcall/the resume boundary.
The default Rust panic hook, however, prints thread '...' panicked at ...
to stderr for every unwind, including these caught ones — so a perfectly
normal Lua error made the CLI look like it had crashed (a Box<dyn Any>
message leaking before catch_unwind swallowed the payload).
install_lua_exception_panic_hook installs (exactly once, process-wide) a
hook that suppresses the message for lua_exception payloads while
delegating every other panic to the previously-installed hook unchanged, so
genuine Rust bugs still surface with their full diagnostics.
Functions§
- install_
lua_ exception_ panic_ hook - Install the
lua_exception-silencing panic hook (idempotent; the first call wins, subsequent calls are no-ops). Safe to call from any VM entry point.