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0363c9495a
3518: Add parse_to_token_tree r=matklad a=edwin0cheng
This PR introduce a function for parsing `&str` to `tt::TokenTree`:
```rust
// Convert a string to a `TokenTree`
pub fn parse_to_token_tree(text: &str) -> Option<(tt::Subtree, TokenMap)> {
````
Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>