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Nicholas Nethercote 15c6e6e092 Add a handle_cycle_error query modifier.
This modifier indicates that a query has a custom handler for cycles.
That custom handler must be found at
`rustc_query_impl::handle_cycle_error::$name`.

This eliminates the need for `specialize_query_vtables`, which is the
current hack to install custom handlers. It's more lines of code in
total, but indicating special treatment of a query via a modifier in
`queries.rs` is more consistent with how other aspects of queries are
handled.
2026-04-03 13:44:12 +11:00
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