enforce unused-must-use lint in macros #55569

durka · 2018-11-01T03:33:37Z

Fixes #55516 by turning on the UNUSED_MUST_USE lint within macros.

rust-highfive · 2018-11-01T03:33:47Z

(rust_highfive has picked a reviewer for you, use r? to override)

rust-highfive · 2018-11-01T04:13:09Z

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

travis_time:end:0e395bb7:start=1541043311335264226,finish=1541043369831285079,duration=58496020853
$ git checkout -qf FETCH_HEAD
travis_fold:end:git.checkout

Encrypted environment variables have been removed for security reasons.
See https://docs.travis-ci.com/user/pull-requests/#Pull-Requests-and-Security-Restrictions
$ export SCCACHE_BUCKET=rust-lang-ci-sccache2
$ export SCCACHE_REGION=us-west-1
Setting environment variables from .travis.yml
$ export IMAGE=x86_64-gnu-llvm-5.0

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

petrochenkov · 2018-11-01T08:09:03Z

I'm going to beta-nominate this to minimize the window in which write!(...); can be used without a warning. It's quite common and may cause too many warnings if the fix is applied too late.

nagisa · 2018-11-01T14:08:30Z

Discussed backport during the T-compiler meeting. Accepted for backport.

nikomatsakis · 2018-11-01T18:58:27Z

r=me but any idea why travis is upset? Is that spurious?

nikomatsakis · 2018-11-01T19:05:15Z

r? @alexcrichton I suppose, who proposed this fix. I don't really have an opinion about whether it's right or not (seems a bit .. weird to me .. to isolate this particular lint...)

alexcrichton · 2018-11-01T19:19:56Z

r=me, but it looks like CI may be failing? It appears an unused result already snuck in!

durka · 2018-11-02T02:09:39Z

Actually relevant part of the log (cc @TimNN):

[00:36:38]    Compiling rustc_resolve v0.0.0 (/checkout/src/librustc_resolve)
[00:36:43] error: unused `std::result::Result` that must be used
[00:36:43]    --> librustc_resolve/resolve_imports.rs:785:17
[00:36:43]     |
[00:36:43] 785 |                 write!(suggestion_choices, "`::{}`", name);
[00:36:43]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[00:36:43]     |
[00:36:43]     = note: `-D unused-must-use` implied by `-D warnings`
[00:36:43]     = note: this `Result` may be an `Err` variant, which should be handled
[00:36:43]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[00:36:43]
[00:36:43] error: unused `std::result::Result` that must be used
[00:36:43]    --> librustc_resolve/resolve_imports.rs:793:17
[00:36:43]     |
[00:36:43] 793 |                 write!(suggestion_choices, "`self::{}`", name);
[00:36:43]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[00:36:43]     |
[00:36:43]     = note: this `Result` may be an `Err` variant, which should be handled
[00:36:43]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[00:36:43]
[00:36:43] error: aborting due to 2 previous errors
[00:36:43]
[00:36:43] error: Could not compile `rustc_resolve`.

durka · 2018-11-02T02:13:56Z

Added in #54201 cc @eddyb. It's writing into suggestion_choices which is... a String. So we should probably just unwrap these? Is that allowed in the compiler?

rust-highfive · 2018-11-02T04:29:09Z

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

travis_time:end:12ca660e:start=1541129290789811539,finish=1541129348751515096,duration=57961703557
$ git checkout -qf FETCH_HEAD
travis_fold:end:git.checkout

Encrypted environment variables have been removed for security reasons.
See https://docs.travis-ci.com/user/pull-requests/#Pull-Requests-and-Security-Restrictions
$ export SCCACHE_BUCKET=rust-lang-ci-sccache2
$ export SCCACHE_REGION=us-west-1
Setting environment variables from .travis.yml
$ export IMAGE=x86_64-gnu-llvm-5.0
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rait/example-calendar.normal/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/impl-trait/example-calendar.normal/auxiliary"
[00:59:45] ------------------------------------------
[00:59:45] 
[00:59:45] ------------------------------------------
[00:59:45] stderr:
[00:59:45] stderr:
[00:59:45] ------------------------------------------
[00:59:45] {"message":"unused `std::result::Result` that must be used","code":{"code":"unused_must_use","explanation":null},"level":"warning","spans":[{"file_name":"<::core::macros::write macros>","byte_start":43,"byte_end":96,"line_start":2,"line_end":2,"column_start":1,"column_end":54,"is_primary":true,"text":[{"text":"$ dst . write_fmt ( format_args ! ( $ ( $ arg ) * ) ) )","highlight_start":1,"highlight_end":54}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"/checkout/src/test/run-pass/impl-trait/example-calendar.rs","byte_start":8168,"byte_end":8187,"line_start":313,"line_end":313,"column_start":13,"column_end":32,"is_primary":false,"text":[{"text":"            write!(s, \"{}\", e);","highlight_start":13,"highlight_end":32}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},"macro_decl_name":"write!","def_site_span":{"file_name":"<::core::macros::write macros>","byte_start":0,"byte_end":98,"line_start":1,"line_end":2,"column_start":1,"column_end":56,"is_primary":false,"text":[{"text":"( $ dst : expr , $ ( $ arg : tt ) * ) => (","highlight_start":1,"sed
[00:59:45]    |
[00:59:45]    |
[00:59:45] LL |     write!(&mut w, ""); // should coerce
[00:59:45]    |
[00:59:45]    |
[00:59:45]    = note: this `Result` may be an `Err` variant, which should be handled
[00:59:45] 
[00:59:45] 
[00:59:45] warning: unused `std::result::Result` that must be used
[00:59:45]    |
[00:59:45]    |
[00:59:45] LL |         write!(&mut s, "test");
[00:59:45]    |
[00:59:45]    |
[00:59:45]    = note: this `Result` may be an `Err` variant, which should be handled
[00:59:45] 
[00:59:45] 
[00:59:45] 
[00:59:45] 
[00:59:45] 
[00:59:45] The actual stderr differed from the expected stderr.
[00:59:45] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/macros/colorful-write-macros/colorful-write-macros.stderr
[00:59:45] To update references, rerun the tests and pass the `--bless` flag
[00:59:45] To only update this specific test, also pass `--test-args macros/colorful-write-macros.rs`
[00:59:45] error: 1 errors occurred comparing output.
[00:59:45] status: exit code: 0
[00:59:45] status: exit code: 0
[00:59:45] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass/macros/colorful-write-macros.rs" "--target=x86ghlight_start":1,"highlight_end":54}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"/checkout/src/test/run-pass/macros/colorful-write-macros.rs","byte_start":884,"byte_end":917,"line_start":35,"line_end":35,"column_start":5,"column_end":38,"is_primary":false,"text":[{"text":"    write!(&mut w as &mut Write, \"\");","highlight_start":5,"highlight_end":38}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},"macro_decl_name":"write!","def_site_span":{"file_name":"<::core::macros::write macros>","byte_start":0,"byte_end":98,"line_start":1,"line_end":2,"column_start":1,"column_end":56,"is_primary":false,"text":[{"text":"( $ dst : expr , $ ( $ arg : tt ) * ) => (","highlight_start":1,"highlight_end":43},{"text":"$ dst . write_fmt ( format_args ! ( $ ( $ arg ) * ) ) )","highlight_start":1,"highlight_end":56}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}}}],"children":[{"message":"this `Result` may be an `Err` variant, which should be handled","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"warning: unused `std::result::Result` that must be used\n  --> /checkout/src/test/run-pass/macros/colorful-write-macros.rs:35:5\n   |\nLL |     write!(&mut w as &mut Write, \"\");\n   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n   |\n   = note: this `Result` may be an `Err` variant, which should be handled\n   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)\n\n"}
[00:59:45] {s/colorful-write-macros.rs:36:5\n   |\nLL |     write!(&mut w, \"\"); // should coerce\n   |     ^^^^^^^^^^^^^^^^^^^\n   |\n   = note: this `Result` may be an `Err` variant, which should be handled\n   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)\n\n"}
[00:59:45] {"message":"unused `std::result::Result` that must be used","code":{"code":"unused_must_use","explanation":null},"level":"warning","spans":[{"file_name":"<::core::macros::write macros>","byte_start":43,"byte_end":96,"line_start":2,"line_end":2,"column_start":1,"column_end":54,"is_primary":true,"text":[{"text":"$ dst . write_fmt ( format_args ! ( $ ( $ arg ) * ) ) )","highlight_start":1,"highlight_end":54}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"/checkout/src/test/run-pass/macros/colorful-write-macros.rs","byte_start":1044,"byte_end":1067,"line_start":42,"line_end":42,"column_start":9,"column_end":32,"is_primary":false,"text":[{"text":"        write!(&mut s, \"test\");","highlight_start":9,"highlight_end":32}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},"macro_decl_name":"write!","def_site_span":{"file_name":"<::core::macros::write macros>","byte_start":0,"byte_end":98,"line_start":1,"line_end":2,"column_start":1,"column_end":56,"is_primary":false,"text":[{"text":"( $ dst : expr , $ ( $ arg : tt ) * ) => (","highlight_start":1,"highlight_end":43},{"text":"$ dst . write_fmt ( format_args ! ( $ ( $ arg ) * ) ) )","highlight_start":1,"highlight_end":56}],"labe

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

alexcrichton · 2018-11-02T14:14:16Z

Looks like some tests may still be failing?

durka · 2018-11-02T18:39:29Z

I blessed all the UI tests but I guess there's more fallout... will fix tonight.

…

On Fri, Nov 2, 2018, 10:14 Alex Crichton ***@***.*** wrote: Looks like some tests may still be failing? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#55569 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAC3n_llwYfO0sOnEtCgOViTl7sxCn1bks5urFNigaJpZM4YFuYC> .

alexcrichton · 2018-11-03T16:48:24Z

@bors: r+

bors · 2018-11-03T16:48:25Z

📌 Commit 706a1cc has been approved by alexcrichton

eddyb · 2018-11-03T17:48:37Z

It's writing into suggestion_choices which is... a String. So we should probably just unwrap these? Is that allowed in the compiler?

Yeah, write!(string, ...) can use unwrap. I wish the error type could be ! in that case, oh well.

bors · 2018-11-04T22:56:30Z

⌛ Testing commit 706a1cc with merge 248745a...

enforce unused-must-use lint in macros Fixes #55516 by turning on the UNUSED_MUST_USE lint within macros.

bors · 2018-11-05T01:41:50Z

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing 248745a to master...

[beta] Fixes #46775 -- don't mutate the process's environment in Command::exec This is a backport of the following PRs: * #55359 * #55569 * #55304

[beta] Fixes #46775 -- don't mutate the process's environment in Command::exec This is a backport of the following PRs: * #55359 * #55569 * #55304 * #55661

enforce unused-must-use lint in macros

9dd2c89

rust-highfive assigned nikomatsakis Nov 1, 2018

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Nov 1, 2018

petrochenkov added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Nov 1, 2018

nagisa added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Nov 1, 2018

rust-highfive assigned alexcrichton and unassigned nikomatsakis Nov 1, 2018

remove unused result in resolve

d5e3e8a

fix test fallout

706a1cc

bors 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-review Status: Awaiting review from the assignee but also interested parties. labels Nov 3, 2018

bors added a commit that referenced this pull request Nov 4, 2018

Auto merge of #55569 - durka:must-use-external-macro, r=alexcrichton

248745a

enforce unused-must-use lint in macros Fixes #55516 by turning on the UNUSED_MUST_USE lint within macros.

bors merged commit 706a1cc into rust-lang:master Nov 5, 2018

alexcrichton mentioned this pull request Nov 7, 2018

[beta] Fixes #46775 -- don't mutate the process's environment in Command::exec #55611

Merged

bors added a commit that referenced this pull request Nov 7, 2018

Auto merge of #55611 - alexcrichton:beta-next, r=alexcrichton

00b9ddb

[beta] Fixes #46775 -- don't mutate the process's environment in Command::exec This is a backport of the following PRs: * #55359 * #55569 * #55304

bors added a commit that referenced this pull request Nov 8, 2018

Auto merge of #55611 - alexcrichton:beta-next, r=alexcrichton

bf00632

[beta] Fixes #46775 -- don't mutate the process's environment in Command::exec This is a backport of the following PRs: * #55359 * #55569 * #55304 * #55661

alexcrichton removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Nov 8, 2018

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enforce unused-must-use lint in macros #55569

enforce unused-must-use lint in macros #55569

durka commented Nov 1, 2018

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petrochenkov commented Nov 1, 2018

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bors commented Nov 5, 2018

enforce unused-must-use lint in macros #55569

enforce unused-must-use lint in macros #55569

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