1.94 beta regression: "malformed `doc` attribute input"

The following errors are all the errors found in the 1.94 beta crater run that are related to the `doc` attribute.

## Error 1
```
[INFO] [stdout] error[E0538]: malformed `doc` attribute input
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-stream-0.1.2/src/lib.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | / #![doc(test(
[INFO] [stdout] 21 | |     no_crate_inject,
[INFO] [stdout]    | |     --------------- found `no_crate_inject` used as a key more than once
[INFO] [stdout] 22 | |     attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables))
[INFO] [stdout] 23 | | ))]
[INFO] [stdout]    | |___^
```

The above error comes from 125 crates that depend on `tokio-stream` verions 0.1.0-0.1.3, such as:
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/3andero.async-redis/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/Dumbeldor.dumbbot/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/AEnterprise.Trovo/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/InterestingBrainPoops.apep/log.txt
* Many others

## Error 2
```
[INFO] [stdout] error[E0539]: malformed `doc` attribute input
[INFO] [stdout]   --> tests/tagname.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     #[doc("other attribute")]
[INFO] [stdout]    |     ^^^^^^-----------------^^
[INFO] [stdout]    |           |
[INFO] [stdout]    |           expected this to be of the form `... = "..."`
```

* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/alexrenda.alacritty/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/bobtwinkles.msdfgen-rs/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/sammosampson.rust-msdfgen/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/assemble-freight-0.2.0/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/assemble-std-0.2.0/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/tagname-0.3.1/log.txt

## Error 3
```
[INFO] [stdout] error[E0539]: malformed `doc` attribute input
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/horrorshow-0.8.3/src/helper.rs:5:9
[INFO] [stdout]    |
[INFO] [stdout]  5 |         #[doc($doc)]
[INFO] [stdout]    |         ^^^^^^----^^
[INFO] [stdout]    |               |
[INFO] [stdout]    |               expected this to be of the form `... = "..."`
[INFO] [stdout] ...
[INFO] [stdout] 13 |     c!("The standard HTML5 doctype (this *is* the doctype you're looking for)." => HTML "<!DOCTYPE html>");
[INFO] [stdout]    |     ------------------------------------------------------------------------------------------------------ in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `c` (in Nightly builds, run with -Z macro-backtrace for more info)
```

Dependendents of `horrorshow` versions 0.6.6, 0.7.0, and 0.8.3
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/X-m7.csv_to_gv_aon/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/fontfinder-1.5.0/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/siquery-1.2.5/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/siquery_cli-1.2.5/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/transitive_frontier-0.1.1/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/dpc.tagwiki/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/jaredwindover.static_site_generator/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/ogham.specsheet/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/wgr523.blockchain-simulator/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/const-tweaker-0.3.1/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/rocket-game-0.1.6/log.txt

## Error 4
```
[INFO] [stdout] error[E0539]: malformed `doc` attribute input
[INFO] [stdout]    --> src/agda/repl.rs:118:13
[INFO] [stdout]     |
[INFO] [stdout] 118 |             #[doc($d)]
[INFO] [stdout]     |             ^^^^^^--^^
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   expected this to be of the form `... = "..."`
[INFO] [stdout] ...
[INFO] [stdout] 134 | next_resp_of!(next_give_action, GiveAction, "Skip until next give-action.");
[INFO] [stdout]     | --------------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `next_resp_of` (in Nightly builds, run with -Z macro-backtrace for more info)
```

* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/agda-mode-0.1.8/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/agda-tac-0.1.5/log.txt

## Error 5
```
[INFO] [stdout] error[E0565]: malformed `doc` attribute input
[INFO] [stdout]   --> sdk/src/protocol/incoming.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 |     #[doc(hidden = "handled transparently by codegen")]
[INFO] [stdout]    |     ^^^^^^^^^^^^^------------------------------------^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  didn't expect any arguments here
```

* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/jonhoo.touchportal-plugin/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/skochev84.sguaba-celestial/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/dco3-0.18.0/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/sguaba-0.9.11/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/touchportal-sdk-0.0.1/log.txt

## Error 6
```
[INFO] [stdout] error[E0565]: malformed `doc` attribute input
[INFO] [stdout]   --> src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | #[doc(hidden("or you will be fired"))]
[INFO] [stdout]    | ^^^^^^^^^^^^------------------------^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             didn't expect any arguments here
```

* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/error_hook-0.2.3/log.txt

## Error 7
```
[INFO] [stdout] error[E0565]: malformed `doc` attribute input
[INFO] [stdout]    --> src/lib.rs:180:1
[INFO] [stdout]     |
[INFO] [stdout] 180 | #[doc(hidden = true)]
[INFO] [stdout]     | ^^^^^^^^^^^^^------^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              didn't expect any arguments here
```

* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/g11-macro-keys-0.3.0/log.txt

## Error 8
```
[INFO] [stdout] error[E0538]: malformed `doc` attribute input
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rgeometry-0.10.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![doc(test(no_crate_inject))]
[INFO] [stdout]   | ^^^^^^^^^^^^---------------^^^
[INFO] [stdout]   |             |
[INFO] [stdout]   |             found `no_crate_inject` used as a key more than once
```

* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/gh/MathiasBrannstrom.image_to_mesh/log.txt

## Error 9
```
(Huge wall of error text omitted)
```

* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/atelier_openapi-0.1.0/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/cargo_atelier-0.2.7/log.txt
* https://crater-reports.s3.amazonaws.com/beta-1.94-2/beta-2026-01-20/reg/weld-bin-0.1.4/log.txt

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1.94 beta regression: "malformed `doc` attribute input" #151865

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1.94 beta regression: "malformed `doc` attribute input" #151865