Raised by module_ when the module still contains a conditional annotation ((@if ...) / #[if(...)]), which the binary format cannot represent. Carries the annotation's source location so the caller can report a located diagnostic. Resolve the conditionals (e.g. with -D/--define) or target a text format instead.

Raised by module_ when a named index or label reference resolves to nothing (an undeclared identifier or an out-of-scope label). Carries the reference's location and a human-readable message, so the caller can report a located diagnostic rather than crash.