No description
8fad8a6881
This PR builds our own `Debug`-like derive-macro machinery for formatting structs, relying on `std::fmt::Formatter` for the actual formatting.
### Usage
A new `ValueDebug` trait is automatically implemented for all `#[turbo_tasks::value]`s, which has a single `.dbg()` method which resolves to a debug representation that can then be printed to the screen. `#[turbo_tasks::value_trait]` also implement the `.dbg()` method directly.
```rust
dbg!(any_vc.dbg().await?);
```
If you have a `#[turbo_tasks::value]` struct with a field that doesn't implement `Debug`, you'll want to declare that field as `#[debug_ignore]`. For instance:
```rust
#[turbo_tasks::value(ContentSource, serialization: none, eq: manual, cell: new, into: new)]
pub struct TurboTasksSource {
#[debug_ignore]
#[trace_ignore]
pub turbo_tasks: Arc<TurboTasks<MemoryBackend>>,
}
```
### Why not use `Debug` directly?
We can't use `Debug` because our values are resolved asynchronously and can nest `Vc`s arbitrarily. I tried using `futures::executor::block_on` to resolve them synchronously in a `Debug` implementation but that causes deadlocks.
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