DUPLICATE — see refactor-a-seven-frontends-borrow-rust-parser-helpers

Same finding: the greenfield frontends call each other's parser support functions, so rparser.inc cannot be omitted without breaking zparser, gparser, eparser and fparser.

Nothing lost. Both measurements are in the survivor — 123 places in zparser.inc from this filing, 198 errors under PXX_NO_RUST across six frontends from that one — along with this ticket's framing against the-substrate-is-ast-and-ir-not-the-parser.md.

Not deleted, per the tombstone convention: a stale reference should resolve to something rather than to nothing.