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Drop reference to disallowed zero width chars in identifiers - #2401

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Closes #2400.

Rust 1.83 updated unicode-xid to 0.2.6, taking the lexer from Unicode 15 to 16. Unicode 15.1 made these characters part of `XID_Continue: https://www.unicode.org/reports/tr31/tr31-38.html#R1a.

@rustbot rustbot added the S-waiting-on-review Status: The marked PR is awaiting review from a maintainer label Nov 1, 2026

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Reference disagrees with rustc on whether zero-width-joiners are allowed

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