Warn if the user tries to use GATs #53364
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Warn if the user tries to use GATs GATs are currently broken, but still accessible behind a feature gate. This leads to people attempting to use them and then immediately encountering ICEs (or other broken behaviour). Here, we emit a warning if the user tries to use any feature associated with GATs, hopefully making it obvious that ICEs and the like are expected. For the meantime, this seems better than continually getting reported errors (for example: [here](https://github.com/rust-lang/rust/issues?q=is%3Aissue+gat+is%3Aclosed) and [here](https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&q=is%3Aissue+generic_associated_types+is%3Aclosed)).
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Rollup of 10 pull requests Successful merges: - #52946 (Documented impl From on line 367 of libserialize/json.rs) - #53234 (Remove Travis shutdown debug scripts, and remove CI-specific DNS settings) - #53313 (Two small improvements) - #53360 (Addressed #51602) - #53364 (Warn if the user tries to use GATs) - #53373 (Tweak unclosed delimiter parser error) - #53377 (std: Use target_pointer_width for BACKTRACE_ELF_SIZE) - #53395 (Use #[non_exhaustive] on internal enums) - #53399 (Tidy: ignore non-Markdown files when linting for the Unstable Book) - #53412 (syntax_ext: remove leftover span_err_if_not_stage0 macro.)
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GATs are currently broken, but still accessible behind a feature gate. This leads to people attempting to use them and then immediately encountering ICEs (or other broken behaviour). Here, we emit a warning if the user tries to use any feature associated with GATs, hopefully making it obvious that ICEs and the like are expected. For the meantime, this seems better than continually getting reported errors (for example: here and here).