error[E0432]: unresolved import `thiserror` (in latest cargo version)

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```
gitpod /workspace/Solver (main) $ cargo add doublets
Updating crates.io index
Adding doublets v0.1.0-pre to dependencies.
Features:
+ data
+ mem
+ num
+ platform
- full
- smallvec
- smallvec-optimization
gitpod /workspace/Solver (main) $ cargo watch -x run
[Running 'cargo run']
Compiling ppv-lite86 v0.2.17
Compiling static_assertions v1.1.0
Compiling getrandom v0.2.15
Compiling num-traits v0.2.19
Compiling platform-data v0.1.0-beta.3
error[E0432]: unresolved import `thiserror`
--> /workspace/.cargo/registry/src/github.com-1ecc6299db9ec823/platform-data-0.1.0-beta.3/src/links.rs:4:10
|
4 | #[derive(thiserror::Error, Debug)]
| ^^^^^^^^^^^^^^^^ no `ThiserrorProvide` in `__private`
|
= note: this error originates in the derive macro `thiserror::Error` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0412]: cannot find type `Request` in module `std::error`
--> /workspace/.cargo/registry/src/github.com-1ecc6299db9ec823/platform-data-0.1.0-beta.3/src/links.rs:4:10
|
4 | #[derive(thiserror::Error, Debug)]
| ^^^^^^^^^^^^^^^^ not found in `std::error`
|
= note: this error originates in the derive macro `thiserror::Error` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0658]: use of unstable library feature 'error_generic_member_access'
--> /workspace/.cargo/registry/src/github.com-1ecc6299db9ec823/platform-data-0.1.0-beta.3/src/links.rs:4:10
|
4 | #[derive(thiserror::Error, Debug)]
| ^^^^^^^^^^^^^^^^
|
= note: see issue #99301 for more information
= help: add `#![feature(error_generic_member_access)]` to the crate attributes to enable
= note: this error originates in the derive macro `thiserror::Error` (in Nightly builds, run with -Z macro-backtrace for more info)

Compiling rand_core v0.6.4
error[E0599]: no method named `thiserror_provide` found for reference `&std::io::Error` in the current scope
--> /workspace/.cargo/registry/src/github.com-1ecc6299db9ec823/platform-data-0.1.0-beta.3/src/links.rs:18:13
|
18 | #[error("unable to allocate memory for links storage: `{0}`")]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `&std::io::Error`

Some errors have detailed explanations: E0412, E0432, E0599, E0658.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `platform-data` due to 4 previous errors
warning: build failed, waiting for other jobs to finish...
[Finished running. Exit status: 101]
```

Reproduce the failure with `cargo add doublets` followed by `cargo watch -x run`, then inspect the reported `platform-data-0.1.0-beta.3/src/links.rs` errors and the dependency versions involved. Done means the project builds and runs without the reported `thiserror` and unstable-feature errors.

Written by the indexing model from the issue text.