Fix dead code lint for functions using impl Trait #54810

jonas-schievink · 2018-10-04T10:40:26Z

This is a minimal fix that doesn't add any new queries or touches unnecessary code. Please nominate for beta backport if wanted.

rust-highfive · 2018-10-04T10:40:29Z

r? @eddyb

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

rust-highfive · 2018-10-04T11:42:24Z

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.

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---
Check compiletest suite=run-pass mode=run-pass (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[00:53:58] 
[00:53:58] running 2872 tests
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[00:59:46] failures:
[00:59:46] 
[00:59:46] 
[00:59:46] ---- [run-pass] run-pass/async-await.rs stdout ----
[00:59:46] normalized stderr:
[00:59:46] warning: struct is never constructed: `Foo`
[00:59:46]   --> $DIR/async-await.rs:122:1
[00:59:46]    |
[00:59:46] LL | struct Foo;
[00:59:46]    |
[00:59:46]    = note: #[warn(dead_code)] on by default
[00:59:46] 
[00:59:46] warning: method is never used: `async_method`
[00:59:46] warning: method is never used: `async_method`
[00:59:46]   --> $DIR/async-await.rs:129:5
[00:59:46]    |
[00:59:46] LL |     async fn async_method(x: u8) -> u8 {
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] The actual stderr differed from the expected stderr.
[00:59:46] Actual stderr saved to /  = note: #[warn(dead_code)] on by default
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] The actual stderr differed from the expected stderr.
[00:59:46] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/impl-trait/existential-minimal/existential-minimal.stderr
[00:59:46] To update references, rerun the tests and pass the `--bless` flag
[00:59:46] To only update this specific test, also pass `--test-args impl-trait/existential-minimal.rs`
[00:59:46] error: 1 errors occurred comparing output.
[00:59:46] status: exit code: 0
[00:59:46] status: exit code: 0
[00:59:46] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass/impl-trait/existential-minimal.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/impl-trait/existential-minimal/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/existential-minimal/auxiliary"
[00:59:46] ------------------------------------------
[00:59:46] 
[00:59:46] ------------------------------------------
[00:59:46] stderr:
[00:59:46] stderr:
[00:59:46] ------------------------------------------
[00:59:46] {"message":"function is never used: `foo`","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"/checkout/src/test/run-pass/impl-trait/existential-minimal.rs","byte_start":494,"byte_end":526,"line_start":15,"line_end":15,"c^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[00:59:46]    = note: #[warn(dead_code)] on by default
[00:59:46] 
[00:59:46] warning: struct is never constructed: `Bar`
[00:59:46]   --> $DIR/issue-49376.rs:20:1
[00:59:46]   --> $DIR/issue-49376.rs:20:1
[00:59:46]    |
[00:59:46] LL | struct Bar {}
[00:59:46] 
[00:59:46] warning: function is never used: `foo`
[00:59:46]   --> $DIR/issue-49376.rs:24:1
[00:59:46]    |
[00:59:46]    |
[00:59:46] LL | fn foo() -> impl Foo {
[00:59:46] 
[00:59:46] warning: function is never used: `test_impl_ops`
[00:59:46]   --> $DIR/issue-49376.rs:28:1
[00:59:46]    |
[00:59:46]    |
[00:59:46] LL | fn test_impl_ops() -> impl Add + Sub + Mul + Div { 1 }
[00:59:46] 
[00:59:46] warning: function is never used: `test_impl_assign_ops`
[00:59:46]   --> $DIR/issue-49376.rs:29:1
[00:59:46]    |
[00:59:46]    |
[00:59:46] LL | fn test_impl_assign_ops() -> impl AddAssign + SubAssign + MulAssign + DivAssign { 1 }
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] The actual stderr differed from the expected stderr.
[00:59:46] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/impl-trait/issue-49376/issue-49376.stderr
[00:59:46] To update references, rerun the tests and pass the `--bless` flag
[00:59:46] To only update this specific test, also pass `--test-args impl-trait/issue-49376.rs`
[00:59:46] error: 1 errors occurred comparing output.
[00:59:46] status: exit code: 0
[00:59:46] status: exit code: 0
[00:59:46] comma_code)] on by default\n\n"}
[00:59:46] {"message":"struct is never constructed: `Bar`","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"/checkout/src/test/run-pass/impl-trait/issue-49376.rs","byte_start":639,"byte_end":649,"line_start":20,"line_end":20,"column_start":1,"column_end":11,"is_primary":true,"text":[{"text":"struct Bar {}","highlight_start":1,"highlight_end":11}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":"warning: struct is never constructed: `Bar`\n  --> /checkout/src/test/run-pass/impl-trait/issue-49376.rs:20:1\n   |\nLL | struct Bar {}\n   | ^^^^^^^^^^\n\n"}
[00:59:46] {"message":"function is never used: `foo`","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"/checkout/src/test/run-pass/impl-trait/issue-49376.rs","byte_start":697,"byte_end":717,"line_start":24,"line_end":24,"column_start":1,"column_end":21,"is_primary":true,"text":[{"text":"fn foo() -> impl Foo {","highlight_start":1,"highlight_end":21}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":"warning: function is never used: `foo`\n  --> /checkout/src/test/run-pass/impl-trait/issue-49376.rs:24:1\n   |\nLL | fn foo() -> impl Foo {\n   | ^^^^^^^^^^^^^^^^^^^^\n\n"}
[00:59:46] {"message":"function is never used: `test_impl_ops`","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"/checkout/src/test/run-pass/impl-trait/issue-49376.rs","byte_start":734,"byte_end":782,"line_start":28,"line_end":28,"co:46] 
[00:59:46] ---- [run-pass] run-pass/issues/issue-49556.rs stdout ----
[00:59:46] warning: function is never used: `iter`
[00:59:46]   --> $DIR/issue-49556.rs:12:1
[00:59:46]    |
[00:59:46]    |
[00:59:46] LL | fn iter<'a>(data: &'a [usize]) -> impl Iterator<Item = usize> + 'a {
[00:59:46]    |
[00:59:46]    = note: #[warn(dead_code)] on by default
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] The actual stderr differed from the expected stderr.
[00:59:46] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/issues/issue-49556/issue-49556.stderr
[00:59:46] To update references, rerun the tests and pass the `--bless` flag
[00:59:46] To only update this specific test, also pass `--test-args issues/issue-49556.rs`
[00:59:46] error: 1 errors occurred comparing output.
[00:59:46] status: exit code: 0
[00:59:46] status: exit code: 0
[00:59:46] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass/issues/issue-49556.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/issues/issue-49556/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/issues/issue-49556/auxiliary"
[00:59:46] ------------------------------------------
[00:59:46] 
[00:59:46] 
[00:59:46] ------------------------------------s":[{"file_name":"/checkout/src/test/run-pass/traits/conservative_impl_trait.rs","byte_start":490,"byte_end":537,"line_start":14,"line_end":14,"column_start":1,"column_end":48,"is_primary":true,"text":[{"text":"fn batches(n: &u32) -> impl Iterator<Item=&u32> {","highlight_start":1,"highlight_end":48}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"#[warn(dead_code)] on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"warning: function is never used: `batches`\n  --> /checkout/src/test/run-pass/traits/conservative_impl_trait.rs:14:1\n   |\nLL | fn batches(n: &u32) -> impl Iterator<Item=&u32> {\n   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n   |\n   = note: #[warn(dead_code)] on by default\n\n"}
[00:59:46] ------------------------------------------
[00:59:46] 
[00:59:46] thread '[run-pass] run-pass/traits/conservative_impl_trait.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3267:9
[00:59:46] 
---
[00:59:46] test result: FAILED. 2856 passed; 6 failed; 10 ignored; 0 measured; 0 filtered out
[00:59:46] 
[00:59:46] 
[00:59:46] 
[00:59:46] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/run-pass" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "run-pass" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-5.0/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Zunstable-options " "--target-rustcflags" "-Crpath -O -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "5.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[00:59:46] 
[00:59:46] 
[00:59:46] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[00:59:46] Build completed unsuccessfully in 0:11:50
[00:59:46] Build completed unsuccessfully in 0:11:50
[00:59:46] Makefile:58: recipe for target 'check' failed
[00:59:46] make: *** [check] Error 1

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:02fa2c9c
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)

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)

oli-obk · 2018-10-04T11:57:04Z

You need to update a bunch of other tests' stderr files, too.

oli-obk · 2018-10-04T11:57:29Z

r? @oli-obk

jonas-schievink · 2018-10-04T12:14:03Z

@oli-obk Ah I see. I wasn't able to run the full test suite because I messed up the LLVM build. Should be fixed now, though.

oli-obk · 2018-10-04T12:22:18Z

Hmm... These are all run-pass tests. We should probably ensure that the functions are called or move the functions to ui // compile-pass tests.

If that's ok with you I'd like to have this done in this PR where we see all the newly occurring warnings (or the lack thereof after the functions are actually called)

jonas-schievink · 2018-10-04T12:58:52Z

@oli-obk Is this what you had in mind? Looks like there's only 1 case where the unused function should have been called, I've moved all other tests to ui and made them compile-pass tests.

oli-obk · 2018-10-04T13:06:13Z

Perfect. Thanks!

@bors r+

bors · 2018-10-04T13:06:14Z

📌 Commit e24f4d5 has been approved by oli-obk

pnkfelix · 2018-10-04T14:40:54Z

discussed at T-compiler weekly meeting. approved for beta backport.

bors · 2018-10-07T05:41:48Z

⌛ Testing commit e24f4d5 with merge 04c1af0c18813daeb32d0585b1e8eccdd4b48cd2...

bors · 2018-10-07T06:52:19Z

💔 Test failed - status-travis

rust-highfive · 2018-10-07T06:52:21Z

The job dist-i686-freebsd 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:028f1f54:start=1538895062676803553,finish=1538895062686899642,duration=10096089
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:10a809cc
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb --batch -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:22f3ed84
travis_time:start:22f3ed84
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:1a8e777f
$ dmesg | grep -i kill

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)

jonas-schievink · 2018-10-07T10:01:12Z

Actual error:

[01:07:28] thread 'main' panicked at 'failed to download openssl source: exit code: 6', bootstrap/native.rs:621:17

(spurious)

Also, is that builder building LLVM twice?

nagisa · 2018-10-07T19:29:49Z

@bors retry

as requested on IRC.

bors · 2018-10-07T19:30:32Z

⌛ Testing commit e24f4d5 with merge b2d6ea9...

Fix dead code lint for functions using impl Trait Fixes #54754 This is a minimal fix that doesn't add any new queries or touches unnecessary code. Please nominate for beta backport if wanted.

bors · 2018-10-07T21:59:57Z

☀️ Test successful - status-appveyor, status-travis
Approved by: oli-obk
Pushing b2d6ea9 to master...

@ghost

[beta] Rollup backports Merged and approved: * #54851: Fix a regression in 1.30 by reverting #53564 * #54865: Backport 1.29.2 release notes to master * #54810: Fix dead code lint for functions using impl Trait r? @ghost

@ghost

[beta] Rollup backports Merged and approved: * #54851: Fix a regression in 1.30 by reverting #53564 * #54865: Backport 1.29.2 release notes to master * #54810: Fix dead code lint for functions using impl Trait r? @ghost

rust-highfive assigned eddyb Oct 4, 2018

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 4, 2018

jonas-schievink mentioned this pull request Oct 4, 2018

No warning for unused function using impl Trait on beta and nightly #54754

Closed

oli-obk added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Oct 4, 2018

rust-highfive assigned oli-obk and unassigned eddyb Oct 4, 2018

jonas-schievink force-pushed the unused-impl-trait branch from cbf1696 to 3c46da8 Compare October 4, 2018 12:13

Fix dead code lint for functions using impl Trait

3c46da8

jonas-schievink added 6 commits October 4, 2018 14:44

Call Foo::async_method in the async-await test

2e1ac08

Convert impl-trait/issue-42479.rs to compile-pass

62e9a09

Convert existential-minimal.rs to compile-pass

12cabc8

Convert issue-49376.rs to compile-pass

7e5a131

Convert issue-49556.rs to compile-pass

31d5878

Convert conservative_impl_trait.rs to compile-pass

e24f4d5

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 Oct 4, 2018

pnkfelix added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Oct 4, 2018

bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 7, 2018

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 Oct 7, 2018

bors merged commit e24f4d5 into rust-lang:master Oct 7, 2018

pietroalbini mentioned this pull request Oct 8, 2018

[beta] Rollup backports #54907

Merged

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

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Fix dead code lint for functions using impl Trait #54810

Fix dead code lint for functions using impl Trait #54810

jonas-schievink commented Oct 4, 2018

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bors commented Oct 7, 2018

Fix dead code lint for functions using impl Trait #54810

Fix dead code lint for functions using impl Trait #54810

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