Function lumen_last_error_global 

#[unsafe(no_mangle)]
pub extern "C" fn lumen_last_error_global() -> *const c_char

Returns the most recent error message recorded by any thread. May return null if no error has ever been recorded. The returned pointer is valid until the next lumen_* call anywhere in the process that produces an error.

Distinguished from lumen_last_error for embedders that explicitly want the global slot and don’t want the TLS fallback.