This week in Rust #265 — 18 dec 2018

https://this-week-in-rust.org/blog/2018/12/18/this-week-in-rust-265/

Updates from core

x86: add the adx target feature to whitelist
https://github.com/rust-lang/rust/pull/56749

bump minimum required LLVM version to 6.0
https://github.com/rust-lang/rust/pull/56642

unconditionally emit the target-cpu LLVM attribute
https://github.com/rust-lang/rust/pull/56609

account for impl Trait when suggesting lifetime
https://github.com/rust-lang/rust/pull/56755

fixed issue with using Self ctor in typedefs
https://github.com/rust-lang/rust/pull/56850

clearer error message for dead assign
https://github.com/rust-lang/rust/pull/56439

emit error with span for empty asserts
https://github.com/rust-lang/rust/pull/56491

fix span for invalid number of parameters in trait method
https://github.com/rust-lang/rust/pull/56641

contexually dependent error message for E0424 when value is assigned to "self"
https://github.com/rust-lang/rust/pull/56572

don't depend on Allocation sizes for pattern length
https://github.com/rust-lang/rust/pull/56540

some cleanups around AllocId management
https://github.com/rust-lang/rust/pull/56461

improve MIR match generation for ranges
https://github.com/rust-lang/rust/pull/56810

rustc: add an unstable simd_select_bitmask intrinsic
https://github.com/rust-lang/rust/pull/56789

allow ptr::hash to accept fat pointers
https://github.com/rust-lang/rust/pull/56751

specialize: remove Boxes used by Children::insert
https://github.com/rust-lang/rust/pull/56744

infer: remove Box from a returned Iterator
infer: remove Box from a returned Iterator

TokenStream improvements
https://github.com/rust-lang/rust/pull/56737

remove tokenstream::Delimited
https://github.com/rust-lang/rust/pull/56369

overhaul FileSearch and SearchPaths
https://github.com/rust-lang/rust/pull/56090

SortedMap upgrades
https://github.com/rust-lang/rust/pull/56039

make const unsafe fn bodies unsafe
https://github.com/rust-lang/rust/pull/56706

self-profiler: add column for percent of total time
https://github.com/rust-lang/rust/pull/56702

#[must_use] on traits in stdlib
https://github.com/rust-lang/rust/pull/56677

fix BTreeMap UB
https://github.com/rust-lang/rust/pull/56648

std: activate compiler_builtins mem feature for no_std targets
https://github.com/rust-lang/rust/pull/56825

add checked_add method to Instant time type
https://github.com/rust-lang/rust/pull/56490

VecDeque: fix for stacked borrows
https://github.com/rust-lang/rust/pull/56161

std: depend directly on crates.io crates
https://github.com/rust-lang/rust/pull/56092

libtest: use deterministic HashMap, avoid spawning thread if there is no concurrency
https://github.com/rust-lang/rust/pull/56243

greatly improve rustdoc rendering speed issues
https://github.com/rust-lang/rust/pull/56005

rustdoc: fix local reexports of proc macros
https://github.com/rust-lang/rust/pull/56637

News

Tools in the 2018 edition.
https://blog.rust-lang.org/2018/12/17/Rust-2018-dev-tools.html

Making Rust float parsing fast and correct.
https://www.reddit.com/r/rust/comments/a6j5j1/making_rust_float_parsing_fast_and_correct/

Bootstrapping Rust.
https://www.gnu.org/software/guix/blog/2018/bootstrapping-rust/

Async in Rust, circa 2018.
https://rust-lang-nursery.github.io/wg-net/2018/12/13/async-update.html

Rust Analyzer in 2018 and 2019.
https://ferrous-systems.com/blog/rust-analyzer-2019/

Rust and WebAssembly in 2019.
http://fitzgeraldnick.com/2018/12/14/rust-and-webassembly-in-2019.html

Storing unboxed trait objects in Rust.
https://guiand.xyz/blog-posts/unboxed-trait-objects.html

Currying in Rust — Part 2 (A glimpse of generics).
https://hashnode.com/post/currying-in-rust-part-2-a-glimpse-of-generics-cjphbgun90025pms241ggh3d9

Building a JS Interpreter in Rust part 1.
https://jason-williams.co.uk/building-a-js-interpreter-in-rust-part-1/

Edge programming with Rust and WebAssembly.
https://www.fastly.com/blog/edge-programming-rust-web-assembly

Crate of the week: yaserde

This week's crate is yaserde, a specialized XML (de)serialization crate compatible with serde. Thanks to Marc Antoine Arnaud for the suggestion!

This week in Rust #266 — 25 dec 2018

https://this-week-in-rust.org/blog/2018/12/25/this-week-in-rust-266/

Updates from core

add targets thumbv7neon-linux-androideabi and thumbv7neon-unknown-linux-gnueabihf
https://github.com/rust-lang/rust/pull/56947

less conservative uninhabitedness check
https://github.com/rust-lang/rust/pull/54125

remove "visited" set from inhabitedness checking
https://github.com/rust-lang/rust/pull/57033

short-circuit DefIdForest::intersection()
https://github.com/rust-lang/rust/pull/57060

make the 'a lifetime on TyCtxt useless
https://github.com/rust-lang/rust/pull/56601

trigger unsized coercions keyed on Sized bounds
https://github.com/rust-lang/rust/pull/56219

fix various aspects around let bindings inside const functions
https://github.com/rust-lang/rust/pull/56160

deny intra-doc link resolution failures in libstd
https://github.com/rust-lang/rust/pull/56941

process nested obligations in autoderef
https://github.com/rust-lang/rust/pull/54252

mark tuple structs as live if their constructors are used
https://github.com/rust-lang/rust/pull/56953

fix alignment for array indexing
https://github.com/rust-lang/rust/pull/57053

enable emission of alignment attrs for pointer params
https://github.com/rust-lang/rust/pull/57021

enum type instead of variant suggestion unification
https://github.com/rust-lang/rust/pull/56188

make basic CTFE tracing available on release builds
https://github.com/rust-lang/rust/pull/56973

remove TokenStream::JointTree
https://github.com/rust-lang/rust/pull/56964

miri: allocation is infallible
https://github.com/rust-lang/rust/pull/56981

fix mutable references in static mut
https://github.com/rust-lang/rust/pull/56916

simplify MIR generation for logical operations
https://github.com/rust-lang/rust/pull/56917

static eval: do not ICE on layout size overflow
https://github.com/rust-lang/rust/pull/56909

disable field reordering for repr(int)
https://github.com/rust-lang/rust/pull/56887

always run rustc in a thread
https://github.com/rust-lang/rust/pull/56813

version-gate the trailing semicolon change of return statements inside a match arm
https://github.com/rust-lang/rustfmt/pull/3250

add DoubleEndedIterator::nth_back
https://github.com/rust-lang/rust/pull/56802

mir-opt: make SimplifyCfg collapse goto chains starting from bb0
https://github.com/rust-lang/rust/pull/56764

treat ref-to-raw cast like a reborrow: do a special kind of retag
https://github.com/rust-lang/rust/pull/56741

MIR borrowck doesn't accept the example of iterating and updating a mutable reference
https://github.com/rust-lang/rust/pull/56649

rework treatment of $crate in procedural macros
https://github.com/rust-lang/rust/pull/56647

tweak query code for performance
https://github.com/rust-lang/rust/pull/56613

implement Eq, PartialEq and Hash for atomic::Ordering
https://github.com/rust-lang/rust/pull/56881

add unstable VecDeque::rotate_{left, right}
https://github.com/rust-lang/rust/pull/56842

remove Cycle::try_fold override
https://github.com/rust-lang/rust/pull/56904

short-circuit Rc/Arc equality checking on equal pointers where T: Eq
https://github.com/rust-lang/rust/pull/56550

stabilize Rc, Arc and Pin as method receivers
https://github.com/rust-lang/rust/pull/56805

stabilize min_const_unsafe_fn in 1.33
https://github.com/rust-lang/rust/pull/57067

stabilize Vec(Deque)::resize_with
https://github.com/rust-lang/rust/pull/57002

stabilize Pin
https://github.com/rust-lang/rust/pull/56939

stabilize underscore_imports
https://github.com/rust-lang/rust/pull/56303

bootstrap: Link LLVM as a dylib with ThinLTO
https://github.com/rust-lang/rust/pull/56944

profiler: simplify total_duration, improve readability
https://github.com/rust-lang/rust/pull/56918

cargo: warn on unused patches
https://github.com/rust-lang/cargo/pull/6470

rustdoc: add new CLI flag to load static files from a different location
https://github.com/rust-lang/rust/pull/57011

News

🎈🎉 Announcing Rust 1.31.1. 🎉🎈
https://blog.rust-lang.org/2018/12/20/Rust-1.31.1.html

Procedural macros in Rust 2018.
https://blog.rust-lang.org/2018/12/21/Procedural-Macros-in-Rust-2018.html

Tokio: A great 2018, an even better 2019.
https://tokio.rs/blog/2018-12-recap-2018/

Using C libraries un Rust: making a *-sys crate.
https://kornel.ski/rust-sys-crate

Rust asynchronous IO: from mio to coroutine.
https://github.com/Hexilee/async-io-demo

Methods for array initialization in Rust.
https://www.joshmcguigan.com/blog/array-initialization-rust/

Currying in rust Part 3 (The circle of life... aka why borrowchecker... why)!?
https://hashnode.com/post/currying-in-rust-part-3-the-circle-of-life-aka-why-borrowchecker-why-cjq3z1dd800dknds1sls4dqav

How to get better at Rust: For beginners.
https://hashnode.com/post/how-to-become-a-rust-super-developer-cjpv1ee7e000buhs2aqrdw2ym

Crate of the week: sandspiel

This week's crate is sandspiel, a WASM-powered online sandbox automaton game. Thanks to Vikrant Chaudhary for the suggestion!

This week in Rust #267 — 01 jan 2019

https://this-week-in-rust.org/blog/2019/01/01/this-week-in-rust-267/

Updates from core

add -Z instrument-mcount
https://github.com/rust-lang/rust/pull/57220

parallel query tweaks
https://github.com/rust-lang/rust/pull/56983

move jemalloc from rustc_driver to rustc
https://github.com/rust-lang/rust/pull/56986

uninline some debugging code and use unlikely! macro
https://github.com/rust-lang/rust/pull/57035

resolve: fix an ICE in import validation
https://github.com/rust-lang/rust/pull/57160

resolve: fix another ICE in import validation
https://github.com/rust-lang/rust/pull/57181

AST/HIR: introduce ExprKind::Err for better error recovery in the front-end
https://github.com/rust-lang/rust/pull/56999

fix new unused patch warning
https://github.com/rust-lang/cargo/pull/6494

suggest .as_ref()? instead of ? in certain circumstances
https://github.com/rust-lang/rust-clippy/pull/3561

suggest .as_ref() when appropriate for Option and Result
https://github.com/rust-lang/rust/pull/57158

tweaks to format string diagnostics
https://github.com/rust-lang/rust/pull/57140

various changes to string format diagnostics
https://github.com/rust-lang/rust/pull/57069

point to cause of fn expected return type
https://github.com/rust-lang/rust/pull/57020

codegen: make zero-sized arrays affect alignment
https://github.com/rust-lang/rust-bindgen/pull/1477

make Alloc::check_bounds_ptr private; you should use Memory::check_bounds_ptr instead
https://github.com/rust-lang/rust/pull/57129

add Unpin to std prelude, not just core
https://github.com/rust-lang/rust/pull/57137

remove the private generic NonZero wrapper type
https://github.com/rust-lang/rust/pull/57133

stabilize Duration::{as_millis, as_micros, as_nanos}
https://github.com/rust-lang/rust/pull/57124

make the getter for NonZero types into a const fn
https://github.com/rust-lang/rust/pull/57167

make tm struct members public
https://github.com/rust-lang/libc/pull/1183

testsuite: require failing commands to check output
https://github.com/rust-lang/cargo/pull/6497

News

This year in gfx-rs: 2018.
https://gfx-rs.github.io/2018/12/27/this-year.html

Comparing Pythagorean triples in C++, D, and Rust.
https://atilanevesoncode.wordpress.com/2018/12/31/comparing-pythagorean-triples-in-c-d-and-rust/

My experience converting a Python library to Rust.
https://alantrick.ca/writings/programming/python_to_rust/

Crate of the week: Dose Response

This week's crate is Dose Response, an online-playable roguelike game with a probably bleak outcome. Thanks to Vikrant Chaudhary for the suggestion!

This week in Rust #268 — 08 jan 2019

https://this-week-in-rust.org/blog/2019/01/08/this-week-in-rust-268/

Updates from core

implement the Re-rebalance coherence RFC
https://github.com/rust-lang/rust/pull/56145

forbid recursive impl trait
https://github.com/rust-lang/rust/pull/56074

allow to dispatch fn traits depending on number of parameters
https://github.com/rust-lang/rust/pull/55986

rustc: fix regression where jemalloc isn't used
https://github.com/rust-lang/rust/pull/57287

syntax: fix regression in diagnostics for patterns in trait method parameters
https://github.com/rust-lang/rust/pull/57251

resolve: simplify treatment of ambiguity errors
https://github.com/rust-lang/rust/pull/57199

calculate privacy access only via query
https://github.com/rust-lang/rust/pull/57343

privacy: fix regression in impl reachability
https://github.com/rust-lang/rust/pull/57344

tweak unicode escape diagnostics
https://github.com/rust-lang/rust/pull/57210

suggest using raw identifiers in 2018 edition when using keywords
https://github.com/rust-lang/rust/pull/57209

do not complain about missing crate named as a keyword
https://github.com/rust-lang/rust/pull/57208

use structured suggestions for nonexistent fields
https://github.com/rust-lang/rust/pull/57047

use structured suggestion for method calls
https://github.com/rust-lang/rust/pull/57291

add specific diagnostic when attempting to transmute between equal generic types
https://github.com/rust-lang/rust/pull/57044

don't emit Unevaluated from const_eval
https://github.com/rust-lang/rust/pull/56723

make CompileController thread-safe
https://github.com/rust-lang/rust/pull/57308

NLL: user type annotations refactor, associated constant patterns and ref bindings
https://github.com/rust-lang/rust/pull/55937

universes
https://github.com/rust-lang/rust/pull/55517

rustdoc: force binary filename for compiled doctests
https://github.com/rust-lang/rust/pull/57338

improve Box<T> → Pin<Box<T>> conversion
https://github.com/rust-lang/rust/pull/57313

eliminate Receiver::recv_timeout panic
https://github.com/rust-lang/rust/pull/56827

VaList::copy should not require a mutable ref
https://github.com/rust-lang/rust/pull/57311

add duration constants
https://github.com/rust-lang/rust/pull/57375

NLL: fix bug in associated constant type annotations
https://github.com/rust-lang/rust/pull/57304

make sure feature gate errors are recoverable
https://github.com/rust-lang/rust/pull/57272

cargo: fix error message when resolving dependencies
https://github.com/rust-lang/cargo/pull/6510

News

Rust cheat sheet for beginners.
https://www.breakdown-notes.com/make/load/rust_cs_canvas/true

Deriving traits in Rust with procedural macros.
https://naftuli.wtf/2019/01/02/rust-derive-macros/

Using Rust for Gamedev.
https://medium.com/@michelotti.matthew/using-rust-for-gamedev-2f60b0e4cc5c

Are we async yet?
https://areweasyncyet.rs/

Building a JS interpreter in Rust part 2.
https://jason-williams.co.uk/building-a-js-interpreter-in-rust-part-2

New Rustacean interview: Carol Nichols || Goulding and Jake Goulding. Talking with Carol and Jake about The Rust Programming Language, Rust in Motion, and Rust Belt Rust.
https://newrustacean.com/show_notes/interview/integer32/

Crate of the week: gfx-hal

This week's crate is gfx-hal, a hardware abstraction layer for gfx-rs. Thanks to Vikrant Chaudhary for the suggestion!

This week in Rust #269 — 15 jan 2019

https://this-week-in-rust.org/blog/2019/01/15/this-week-in-rust-269/

Updates from core

add miri to rustup
https://github.com/rust-lang/rustup.rs/pull/1606

fix undefined behavior
https://github.com/rust-lang/rust/pull/57511

resolve: mark extern crate items as used in more cases
https://github.com/rust-lang/rust/pull/57557

clarify resolve typo suggestion
https://github.com/rust-lang/rust/pull/57477

privacy: fix private-in-public check for existential types
https://github.com/rust-lang/rust/pull/57556

tweak output of type mismatch between "then" and else if arms
https://github.com/rust-lang/rust/pull/57381

use structured suggestion when casting a reference
https://github.com/rust-lang/rust/pull/57493

use structured suggestions for nonstandard style lints
https://github.com/rust-lang/rust/pull/57387

point at match discriminant on type error in match arm pattern
https://github.com/rust-lang/rust/pull/57366

const-stabilize const_int_ops + const_ip
https://github.com/rust-lang/rust/pull/57234

don't actually create a full MIR stack frame when not needed
https://github.com/rust-lang/rust/pull/57351

speed up item_bodies for large match statements involving regions
https://github.com/rust-lang/rust/pull/57494

change String to &'static str in ParseResult::Failure
https://github.com/rust-lang/rust/pull/57461

parallelize and optimize parts of HIR map creation
https://github.com/rust-lang/rust/pull/57232

stabilize cfg_target_vendor
https://github.com/rust-lang/rust/pull/57465

stabilize cfg_attr_multi
https://github.com/rust-lang/rust/pull/57332

stabilize core::convert::identity
https://github.com/rust-lang/rust/pull/57322

stabilize let bindings and destructuring in constants and const fn
https://github.com/rust-lang/rust/pull/57175

clean up and optimize OpenTask / read_index
https://github.com/rust-lang/rust/pull/57114

NLL: add union justifications to conflicting borrows
https://github.com/rust-lang/rust/pull/57102

fix and optimize query profiling
https://github.com/rust-lang/rust/pull/57095

make TokenStream less recursive
https://github.com/rust-lang/rust/pull/57004

replace LockCell with atomic types
https://github.com/rust-lang/rust/pull/56614

make more passes incremental
https://github.com/rust-lang/rust/pull/51487

librustc_mir: fix ICE with slice patterns
https://github.com/rust-lang/rust/pull/57538

don't unwrap unexpected tokens in format!
https://github.com/rust-lang/rust/pull/57522

stabilize uniform_paths
https://github.com/rust-lang/rust/pull/56759

stabilize irrefutable if-let and while-let patterns
https://github.com/rust-lang/rust/pull/57535

stabilize if_while_or_patterns
https://github.com/rust-lang/rust/pull/57532

std: render large exit codes as hex on Windows
https://github.com/rust-lang/rust/pull/57473

add #[must_use] to Iterator and Future
https://github.com/rust-lang/rust/pull/57549

std: force Instant::now() to be monotonic
https://github.com/rust-lang/rust/pull/56988

optimise floating point is_finite (2x) and is_infinite (1.6x)
https://github.com/rust-lang/rust/pull/57353

cargo --{example,bin,bench,test} with no argument now lists all available targets
https://github.com/rust-lang/cargo/pull/6505

rustup: fix utils::copy_file for symlink
https://github.com/rust-lang/rustup.rs/pull/1521

rustdoc: allow inlining of reexported crates and crate items
https://github.com/rust-lang/rust/pull/57508

News

Writing an OS in Rust: Introduction to paging.
https://os.phil-opp.com/paging-introduction/

Librnoscript is almost rustified now.
https://people.gnome.org/~federico/blog/librnoscript-is-almost-rustified.html

Understanding Rust lifetimes.
https://medium.com/nearprotocol/understanding-rust-lifetimes-e813bcd405fa

const types, traits and implementations in Rust.
https://varkor.github.io/blog/2019/01/11/const-types-traits-and-implementations-in-Rust.html

Generate Rust tests from data files.
https://blog.cyplo.net/posts/2018/12/generate-rust-tests-from-data.html

The evolution of a Rust programmer.
http://antoyo.ml/evolution-rust-programmer

Crate of the week: ropey

This week's crate is ropey, an editable text buffer data structure. Thanks to Vikrant Chaudhary for the suggestion!