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Merge #3518
authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>
Mon, 9 Mar 2020 08:43:07 +0000 (08:43 +0000)
committerGitHub <noreply@github.com>
Mon, 9 Mar 2020 08:43:07 +0000 (08:43 +0000)
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>

Trivial merge
Empowering everyone to build reliable and efficient software.