Hello!

This is the first instance of a monthly changelog for rust-analyzer. This changelog also serves as a transparency measure for our OpenCollective. We want to thank all sponsors, especially Embark Studios, as well as all individual contributors. You will also find a detailed bookkeeping record around your donation here within the next week.

Notable changes since last month include:

New Features

• Initial support for .await syntax (#1558).
• Type inference for ? (#1512).
• Completion for type aliases (#1472).
• Mutable variables are underlined (#1544, #1550).
• add_impl_members adds types (#1476).
• Sumbodules with raw names and #[path] are resolved (#1478, #1499).
• Correctly add obligations in function methods (#1496).
• Initial type inference for for loops (#1501).
• Use bounds on generic parameters during type inference (#1515).
• Completions works for fields of enum variants and in patterns (#1525, #1572).
• Show types of local variables in completion (#1582).

Fixes

• Make goto definition work with various Vim clients (#1511).
• Diagnostics are collected for a single file (#1494).
• Show code lens for fn main (#1536).
• Fix discovery of lang items (#1514).

Internal Improvements

• Share the lexer with rustc (#1575).
• Migrate to the new version of rowan library, improving memory usage of syntax trees for 60% (#1545).
• Pick up floundering work from chalk (#1532).
• Many improvements and cleanups by (@kjeremy).

The highlight of the month is probably #1575. The end-game for rust-analyzer is to become a different front-end for the code that rustc itself uses. This pull request is the first step on this path: now, rust-analyzer and rustc use the same code for lexing Rust.