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bors[bot] faddea9353
Merge #6158 
6158: Fix for negative literals in macros r=matklad a=cutsoy

_This pull request fixes #6028._

When writing `-42.0f32` in Rust, it is usually parsed as two different tokens (a minus operator and a float literal).

But a procedural macro can also generate new tokens, including negative [float literals](https://doc.rust-lang.org/stable/proc_macro/struct.Literal.html#method.f32_suffixed):

```rust
#[proc_macro]
fn example_verbose(input: TokenStream) -> TokenStream {
    let literal = Literal::f32_suffixed(-42.0);
    quote! { #literal }
}
```

or even shorter

```rust
#[proc_macro]
fn example(input: TokenStream) -> TokenStream {
    let literal = -42.0f32;
    quote! { #literal }
}
```

Unfortunately, these currently cause RA to crash:

```
thread '<unnamed>' panicked at 'Fail to convert given literal Literal {
    text: "-42.0f32",
    id: TokenId(
        4294967295,
    ),
}', crates/mbe/src/subtree_source.rs:161:28
```

This pull request contains both a fix 8cf9362 and a unit test 27798ee. In addition, I installed the patched server with `cargo xtask install --server` and verified in VSCode that it no longer crashes when a procedural macro returns a negative number literal.

Co-authored-by: Tim <tim@glacyr.com>
2020-10-07 09:32:47 +00:00
.cargo Use lld on winsows 2020-08-19 20:17:49 +02:00
.github "How I survived Git" tips 2020-09-01 09:50:48 +02:00
.vscode vscode client side tests 2020-05-20 22:31:39 +03:00
assets Add SVG logos to assets directory 2020-08-28 21:41:45 +10:00
crates Merge #6158 2020-10-07 09:32:47 +00:00
docs Update manual.adoc 2020-10-07 00:44:32 +03:00
editors/code Make ImportPrefix a configuration option 2020-10-05 17:41:49 +02:00
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README.md

rust-analyzer logo

rust-analyzer is an experimental modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.

Work on rust-analyzer is sponsored by

Ferrous Systems

Quick Start

https://rust-analyzer.github.io/manual.html#installation

Documentation

If you want to contribute to rust-analyzer or are just curious about how things work under the hood, check the ./docs/dev folder.

If you want to use rust-analyzer's language server with your editor of choice, check the manual folder. It also contains some tips & tricks to help you be more productive when using rust-analyzer.

Communication

For usage and troubleshooting requests, please use "IDEs and Editors" category of the Rust forum:

https://users.rust-lang.org/c/ide/14

For questions about development and implementation, join rls-2.0 working group on Zulip:

https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frls-2.2E0

Quick Links

License

Rust analyzer is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).

See LICENSE-APACHE and LICENSE-MIT for details.