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c47f4e036a
- Fix single non-curly groups is ignored `true => ((),)`, old: `(),`, new: `((),)`
Example
---
```rust
const _: i32 = cfg_select! { true => 2 + 3, _ => 3 + 4 };
```
**Before this PR**
```rust
const _: i32 = cfg_select! { true => 2 /* expected a token tree after `=>` */+ 3, _ => 3 + 4 };
```
**After this PR**
```rust
const _: i32 = 2 + 3;
```