Function without_source_positions 

pub fn without_source_positions(schema: &Schema) -> Schema

schema with every SourceSpan zeroed.

Two IRs are identical (docs/design/multi-file-schemas.md section 8) when they are equal after this: positions differ by definition between a split schema and its concatenated equivalent, and nothing else is excluded. Declaration order, /// docs and attribute text all still count.

Implemented over the serialized form: every JSON object whose keys are exactly start, end and line has all three set to 0. SourceSpan is the only IR type with that shape, which a test in cratestack-parser pins against a rich schema.