macros: hygienize use of `core`/`std` in builtin macros #46550

jseyfried · 2017-12-07T04:44:21Z

Today, if a builtin macro wants to access an item from core or std (depending #![no_std]), it generates ::core::path::to::item or ::std::path::to::item respectively (c.f. fn std_path() in libsyntax/ext/base.rs).

This PR refactors the builtin macros to instead always emit $crate::path::to::item here. That is, the def site of builtin macros is taken to be in extern crate core; or extern crate std;. Since builtin macros are macros 1.0 (i.e. mostly unhygienic), changing the def site can only effect the resolution of $crate.

r? @nrc

nrc · 2017-12-08T08:16:11Z

@bors: r+

bors · 2017-12-08T08:16:12Z

📌 Commit 6f8df8c has been approved by nrc

bors · 2017-12-08T16:54:51Z

⌛ Testing commit 6f8df8c with merge f40e75d38b2de81b9cf034d4f8c64b003ae79361...

bors · 2017-12-08T18:32:12Z

💔 Test failed - status-travis

jseyfried · 2017-12-09T04:57:45Z

@bors r=nrc

bors · 2017-12-09T04:57:46Z

📌 Commit d4b7c2c has been approved by nrc

bors · 2017-12-09T06:26:01Z

⌛ Testing commit d4b7c2c963266d22f6661fb0febceba20621788b with merge 504235de64dce04ff0d720bec0a16f2dc8bb55f8...

bors · 2017-12-09T08:08:09Z

💔 Test failed - status-travis

kennytm · 2017-12-09T13:59:31Z

The pretty tests produced identifier paths without its crate (::clone::Clone instead of core::clone::Clone), legit.

...
[01:37:23] ---- [pretty] run-pass/uninit-empty-types.rs stdout ----
[01:37:23] 	
[01:37:23] error: pretty-printed source (expanded) does not typecheck
[01:37:23] status: exit code: 101
[01:37:23] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "-" "-Zno-trans" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/uninit-empty-types.pretty-out" "--target=x86_64-unknown-linux-gnu" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/uninit-empty-types.stage2-x86_64-unknown-linux-gnu.pretty.aux" "-Crpath" "-O" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers"
[01:37:23] stdout:
[01:37:23] ------------------------------------------
[01:37:23] 
[01:37:23] ------------------------------------------
[01:37:23] stderr:
[01:37:23] ------------------------------------------
[01:37:23] error[E0433]: failed to resolve. Did you mean `core::clone`?
[01:37:23]   --> <anon>:26:8
[01:37:23]    |
[01:37:23] 26 | impl ::clone::Clone for Foo {
[01:37:23]    |        ^^^^^ Did you mean `core::clone`?
[01:37:23] 
[01:37:23] warning: unused import: `std::prelude::v1::*`
[01:37:23]  --> <anon>:4:5
[01:37:23]   |
[01:37:23] 4 | use std::prelude::v1::*;
[01:37:23]   |     ^^^^^^^^^^^^^^^^^^^
[01:37:23]   |
[01:37:23]   = note: #[warn(unused_imports)] on by default
[01:37:23] 
[01:37:23] warning: unused `#[macro_use]` import
[01:37:23]  --> <anon>:5:1
[01:37:23]   |
[01:37:23] 5 | #[macro_use]
[01:37:23]   | ^^^^^^^^^^^^
[01:37:23] 
[01:37:23] error: cannot continue compilation due to previous error
[01:37:23] 
[01:37:23] 
[01:37:23] ------------------------------------------
[01:37:23] 
[01:37:23] thread '[pretty] run-pass/uninit-empty-types.rs' panicked at 'explicit panic', /checkout/src/tools/compiletest/src/runtest.rs:2770:8
[01:37:23] 
[01:37:23] 
[01:37:23] failures:
[01:37:23]     [pretty] run-pass/associated-types-binding-in-where-clause.rs
[01:37:23]     [pretty] run-pass/deriving-clone-enum.rs
[01:37:23]     [pretty] run-pass/deriving-clone-generic-enum.rs
[01:37:23]     [pretty] run-pass/deriving-clone-generic-struct.rs
[01:37:23]     [pretty] run-pass/deriving-clone-generic-tuple-struct.rs
[01:37:23]     [pretty] run-pass/deriving-clone-struct.rs
[01:37:23]     [pretty] run-pass/deriving-clone-tuple-struct.rs
[01:37:23]     [pretty] run-pass/deriving-enum-single-variant.rs
[01:37:23]     [pretty] run-pass/deriving-in-macro.rs
[01:37:23]     [pretty] run-pass/deriving-meta-multiple.rs
[01:37:23]     [pretty] run-pass/deriving-meta.rs
[01:37:23]     [pretty] run-pass/deriving-via-extension-hash-struct.rs
[01:37:23]     [pretty] run-pass/issue-14399.rs
[01:37:23]     [pretty] run-pass/issue-15689-2.rs
[01:37:23]     [pretty] run-pass/issue-19037.rs
[01:37:23]     [pretty] run-pass/issue-21402.rs
[01:37:23]     [pretty] run-pass/issue-6341.rs
[01:37:23]     [pretty] run-pass/uninit-empty-types.rs
[01:37:23] 
[01:37:23] test result: �[31mFAILED�(B�[m. 2792 passed; 18 failed; 39 ignored; 0 measured; 0 filtered out

…in macros.

jseyfried · 2017-12-11T17:20:13Z

@bors r=nrc

bors · 2017-12-11T17:20:14Z

📌 Commit 3bade7f has been approved by nrc

arielb1 · 2017-12-11T19:10:10Z

This feels like it's ignoring a bit too many tests, which means that pretty might be very broken. If this is not fixed quickly it could remain broken for quite some time.

@bors r-

jseyfried · 2017-12-11T19:20:28Z

Ok, was going to write fix in separate PR -- I'll make sure to avoid regressing these tests then though.

jseyfried · 2017-12-11T19:27:48Z

Pretty is already "broken" for $crate:: paths in the sense that the output doesn't resolve; this PR just makes it worse by using more $crate:: paths.

I can fix the $crate:: case in most cases by using fn eliminate_crate_var (librustc_resolve/macros.rs) as we do for macros 1.1. However, there is still the issue that pretty doesn't play well with hygiene.

arielb1 · 2017-12-12T15:53:56Z

@jseyfried

Sure I know about that, I just don't want to let all the pretty tests bitrot before that gets fixed

jseyfried · 2017-12-13T08:03:02Z

I avoided regressing any pretty tests by printing $crate::.. paths from builtin macros as ::core::.. or ::std::.. where appropriate.

@bors r=nrc

bors · 2017-12-13T08:03:47Z

📌 Commit 85d19b3 has been approved by nrc

kennytm · 2017-12-13T10:02:53Z

@bors p=1 — increase priority to unblock #46551.

bors · 2017-12-13T11:10:02Z

⌛ Testing commit 85d19b3 with merge 3dfbc88...

@nrc

macros: hygienize use of `core`/`std` in builtin macros Today, if a builtin macro wants to access an item from `core` or `std` (depending `#![no_std]`), it generates `::core::path::to::item` or `::std::path::to::item` respectively (c.f. `fn std_path()` in `libsyntax/ext/base.rs`). This PR refactors the builtin macros to instead always emit `$crate::path::to::item` here. That is, the def site of builtin macros is taken to be in `extern crate core;` or `extern crate std;`. Since builtin macros are macros 1.0 (i.e. mostly unhygienic), changing the def site can only effect the resolution of `$crate`. r? @nrc

bors · 2017-12-13T13:43:26Z

☀️ Test successful - status-appveyor, status-travis
Approved by: nrc
Pushing 3dfbc88 to master...

rust-highfive assigned nrc Dec 7, 2017

jseyfried mentioned this pull request Dec 7, 2017

macros: improve 1.0/2.0 interaction #46551

Merged

kennytm added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 7, 2017

jseyfried force-pushed the cleanup_builtin_hygiene branch from 6f8df8c to d4b7c2c Compare December 9, 2017 00:43

kennytm added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 9, 2017

Use hygiene to access the injected crate (core or std) from built…

9c7969d

…in macros.

jseyfried force-pushed the cleanup_builtin_hygiene branch from d4b7c2c to 3bade7f Compare December 11, 2017 06:09

kennytm added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Dec 11, 2017

kennytm added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Dec 11, 2017

Fix fallout in tests.

8dbe79a

Refactor MarkData field modern: bool to kind: MarkKind.

f79c7e4

jseyfried force-pushed the cleanup_builtin_hygiene branch from 3bade7f to 57f373f Compare December 12, 2017 21:15

Improve pretty printing $crate:: paths.

85d19b3

jseyfried force-pushed the cleanup_builtin_hygiene branch from 57f373f to 85d19b3 Compare December 13, 2017 06:32

rust-lang deleted a comment from bors Dec 13, 2017

kennytm added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Dec 13, 2017

bors merged commit 85d19b3 into rust-lang:master Dec 13, 2017

bors mentioned this pull request Dec 13, 2017

incr.comp.: Speed up span hashing by caching expansion context hashes. #46562

Merged

jseyfried deleted the cleanup_builtin_hygiene branch December 13, 2017 18:58

xorl mentioned this pull request Dec 14, 2017

New rust core PR breaks rocket_codegen on nightly rwf2/Rocket#503

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macros: hygienize use of `core`/`std` in builtin macros #46550

macros: hygienize use of `core`/`std` in builtin macros #46550

jseyfried commented Dec 7, 2017

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macros: hygienize use of core/std in builtin macros #46550

macros: hygienize use of core/std in builtin macros #46550

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macros: hygienize use of `core`/`std` in builtin macros #46550

macros: hygienize use of `core`/`std` in builtin macros #46550

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