jyn514

PS C:\Users\Joshua Nelson\src\rust2> git worktree add ../rust5
Preparing worktree (new branch 'rust5')
Updating files: 100% (38772/38772), done.
HEAD is now at e4330295d9b Give a more helpful error for "trimmed_def_paths construted"
PS C:\Users\Joshua Nelson\src\rust2> cd ../rust5
PS C:\Users\Joshua Nelson\src\rust5> ./x.ps1 build --dry-run
downloading https://static.rust-lang.org/dist/2022-11-01/rust-std-beta-x86_64-pc-windows-msvc.tar.xz
#################################################################################################################### 100.0%
extracting C:\Users\Joshua Nelson\src\rust5\build\cache\2022-11-01\rust-std-beta-x86_64-pc-windows-msvc.tar.xz
downloading https://static.rust-lang.org/dist/2022-11-01/rustc-beta-x86_64-pc-windows-msvc.tar.xz

jyn514

Building rustbuild
    Finished dev [unoptimized] target(s) in 0.04s
Building stage0 library artifacts (aarch64-unknown-linux-gnu -> aarch64-unknown-linux-gnu)
    Finished release [optimized] target(s) in 38.39s
Copying stage0 library from stage0 (aarch64-unknown-linux-gnu -> aarch64-unknown-linux-gnu / aarch64-unknown-linux-gnu)
Building stage0 compiler artifacts (aarch64-unknown-linux-gnu -> aarch64-unknown-linux-gnu)
    Finished release [optimized] target(s) in 2m 46s
Copying stage0 rustc from stage0 (aarch64-unknown-linux-gnu -> aarch64-unknown-linux-gnu / aarch64-unknown-linux-gnu)
Assembling stage1 compiler (aarch64-unknown-linux-gnu)
Building stage0 tool clippy-driver (aarch64-unknown-linux-gnu)

jyn514

[
{"name":"std::thread::LocalKey::<T>::try_with","instantiation_count":3214,"size_estimate":58,"total_estimate":186412},
{"name":"hashbrown::raw::RawTable::<T, A>::reserve_rehash","instantiation_count":277,"size_estimate":402,"total_estimate":111354},
{"name":"rustc_query_system::query::plumbing::try_load_from_disk_and_cache_in_memory","instantiation_count":228,"size_estimate":449,"total_estimate":102372},
{"name":"rustc_query_system::dep_graph::DepGraph::<K>::with_task_impl","instantiation_count":228,"size_estimate":391,"total_estimate":89148},
{"name":"rustc_query_system::query::plumbing::execute_job","instantiation_count":228,"size_estimate":376,"total_estimate":85728},
{"name":"rustc_middle::ty::tls::with_context_opt","instantiation_count":1599,"size_estimate":53,"total_estimate":84747},
{"name":"plumbing::force_from_dep_node","instantiation_count":285,"size_estimate":296,"total_estimate":84360},
{"name":"std::ptr::const_ptr::<impl *const T>::is_aligned_to","instantiation_count":1722,"size_estimate":46,"t

jyn514

Item	Instantiation count	Estimated Cost Per Instantiation	Total Estimated Cost
std::thread::LocalKey::::try_with	3214	58	186412
hashbrown::raw::RawTable::<T, A>::reserve_rehash	277	402	111354
rustc_query_system::query::plumbing::try_load_from_disk_and_cache_in_memory	228	449	102372
rustc_query_system::dep_graph::DepGraph::::with_task_impl	228	391	89148
rustc_query_system::query::plumbing::execute_job	228	376	85728
rustc_middle::ty::tls::with_context_opt	1599	53	84747
plumbing::force_from_dep_node	285	296	84360
std::ptr::const_ptr::::is_aligned_to	1722	46	79212

jyn514

(I plan to publish this as a blog post once a few people have looked at it and caught the obvious typos.)

I got lots of positive feedback about the FAQ section in my Rust 2020 blog post, so I'm trying that format again for another topic that's been requested a lot: How to fix common borrow-checker issues. This isn't meant to explain how or why the borrow checker works the way it does (see The Nomicon or Two Beautiful Rust Programs for that), just how to work around some of its current limitations.

jyn514

Projects

The main projects I work on are docs.rs, saltwater cc, and the rust compiler itself.

Hardware

Normally I compile on my laptop, which is a 4 core 7th gen i5 with 8 GB memory. When I started working on rustc itself, that was unbearably slow (over 45 minutes for a stage 1 build),

jyn514

A builtin-macro was attempted to be registered twice.

Erroneous code example:

#![feature(decl_macro)]
#![feature(rustc_attrs)]

#[rustc_builtin_macro]
pub macro test($item:item) {

jyn514

import sys
from collections import defaultdict, Counter

def lexer():
    for line in sys.stdin:
        for token in line.split():
            yield token

def lookup(var, scope):
    while scope.get(var):

jyn514

layout	title	date	audience	excerpt
post	the-intra-doc-links-saga	2020-08-08 00:01:14 -0400	developers

N.B. This post assumes some familiarity with [the Rust programming language][rust].

jyn514

error[E0433]: failed to resolve: could not find `handle` in `sys`
  --> library/std/src/sys/windows/ext/process.rs:13:27
   |
13 |         let handle = sys::handle::Handle::new(handle as *mut _);
   |                           ^^^^^^ could not find `handle` in `sys`

error[E0425]: cannot find function `symlink_inner` in module `sys::fs`
   --> library/std/src/sys/windows/ext/fs.rs:544:14
    |
544 |     sys::fs::symlink_inner(src.as_ref(), dst.as_ref(), false)