2019-10-10

Announcements

@centril is splitting libsyntax into data and logic parts which will decrease the amount of code librustc depends on.
@nagisa a cross-platform version of stacker which will allow us to avoid stack overflows in rustc.
There is a compiler team design meeting scheduled for tomorrow (2019-10-11) to discuss some of @Zoxc’s PRs.
@pnfelix is revising the code that handles structural match checking.
@nikomatsakis has a PR (#65232) up which helps us get closer to lazy normalization.
wg-traits is going to start holding a weekly “office hours” video call to help answer questions and teach people about trait system internals.

Ensure that associated async fns have unique fresh param names #65142
- Approved for beta backport
Account for macro invocation in let mut $pat diagnostic. #65123
- Approved for beta backport
Fix the start/end byte positions in the compiler JSON output #65074
- Declined for beta backport
extract expected return type for async fn generators #64999
- Declined for beta backport

wg-rustc-dev-guide has been working on transcribing videos from the compiler lecture series into rustc-dev-guide chapters.
Originally, individuals were assigned one or lectures to complete but that hasn’t worked very well.
Recently, they’re trying to work on one video at a time as a team with much better results.
There’s a PR open for a new chapter based on the ty lecture.

rustc has upgraded to the LLVM 9 release;
- Which allows us to replace some the emscripten stuff with LLVM’s toolchain. The less emscripten we have to deal with, the better!
- As part of these upgrades we will likely end up dropping support for the super old LLVM 6, which in turn allows us to stop building the unnecessary Go & OCaml bindings to LLVM, which in turn helps rustc build times slightly.
People are also working on enabling use of the new pass manager, which might give us some tangible code quality improvements over the status quo.