Static try_errflag 

pub static try_errflag: AtomicI64

Port of mod_export zlong try_errflag from Src/loop.c:719. Initialized to -1 (sentinel: “no try block has fired yet in this scope”); the exectry always-arm sets it to errflag & ERRFLAG_ERROR before running the always body, then restores. TRY_BLOCK_ERROR param (IPDEF6 at Src/params.c:364) reads this global directly.