I’m imagining an open source crate that:

•	Generates Rust structs from COBOL copybooks.
•	Shows side-by-side code for common patterns.
•	Includes utilities for fixed-width parsing, EBCDIC, and decimal math.
•	Lets you verify that Rust output matches the original COBOL.

Not a migration factory — more of a Rosetta Stone for devs who need to read, rewrite, or replace COBOL incrementally.

Would this be useful in the real world ? I know there are a lot of enterprise tools that convert code to Java.

That’s completely out of my league, but something I would be interested to pursue.

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