Turn implied_outlives_bounds into a query by tmandry · Pull Request #51959 · rust-lang/rust

tmandry · 2018-07-01T03:40:46Z

Right now all this does is remove the error reporting in implied_outlives_bounds, which seems to work. Farming out full tests to Travis.

For #51649. That issue is deferred so not sure what's next.

r? @nikomatsakis

nikomatsakis · 2018-07-01T14:11:35Z

@tmandry oh, nice! This PR was a bit unexpected, but happy to have it! =) I did do some tests locally which suggest that the error reporting code is basically dead code (I added a bug! call and it never fired), so that's good news for making this into a query. Let me take a look.

tmandry · 2018-07-01T14:32:41Z

Hmm, I had triggered it on one test, see #51649 (comment).

This PR doesn’t actually make it a query, yet, btw :)

rust-highfive · 2018-07-04T18:26:45Z

The job x86_64-gnu-llvm-3.9 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.


[00:04:32] travis_fold:start:tidy
travis_time:start:tidy
tidy check
[00:04:33] tidy error: /checkout/src/librustc/traits/query/outlives_bounds.rs:54: TODO is deprecated; use FIXME
[00:04:34] some tidy checks failed
[00:04:34] 
[00:04:34] 
[00:04:34] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor" "--quiet"
[00:04:34] 
[00:04:34] 
[00:04:34] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
[00:04:34] Build completed unsuccessfully in 0:01:35
[00:04:34] Build completed unsuccessfully in 0:01:35
[00:04:34] make: *** [tidy] Error 1
[00:04:34] Makefile:79: recipe for target 'tidy' failed

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:198c3b67
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)
---
travis_time:end:04893d79:start=1530728360512830631,finish=1530728360519839971,duration=7009340
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:0db215d0
$ head -30 ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
head: cannot open ‘./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers’ for reading: No such file or directory
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:319be292
$ 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)

rust-highfive · 2018-07-04T19:34:51Z

The job x86_64-gnu-llvm-3.9 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.

[00:57:55] error: /checkout/src/test/compile-fail/issue-20831-debruijn.rs:1: unexpected error: '1:1: 1:1: mismatched types [E0308]'
[00:57:55] 
[00:57:55] error: 2 unexpected errors found, 0 expected errors not found
[00:57:55] status: exit code: 101
[00:57:55] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/compile-fail/issue-20831-debruijn.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/compile-fail/issue-20831-debruijn/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/compile-fail/issue-20831-debruijn/auxiliary" "-A" "unused"
[00:57:55]     Error {
[00:57:55]         line_num: 1,
[00:57:55]         kind: Some(
[00:57:55]             Error
---
[00:57:55] 
[00:57:55] thread 'main' panicked at 'Some tests failed', tools/compiletest/src/main.rs:498:22
[00:57:55] 
[00:57:55] 
[00:57:55] 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/compile-fail" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/compile-fail" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "compile-fail" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-3.9/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" "3.9.1\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[00:57:55] 
[00:57:55] 
[00:57:55] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[00:57:55] Build completed unsuccessfully in 0:14:36
[00:57:55] Build completed unsuccessfully in 0:14:36
[00:57:55] make: *** [check] Error 1
[00:57:55] Makefile:58: recipe for target 'check' failed
2410096 ./obj
2410064 ./obj/build
1815876 ./obj/build/x86_64-unknown-linux-gnu
730160 ./src
---
144248 ./obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu
144244 ./obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release
143864 ./obj/build/x86_64-unknown-linux-gnu/stage1-std
129816 ./obj/build/bootstrap/debug/incremental/bootstrap-146vjsckowoo9
129812 ./obj/build/bootstrap/debug/incremental/bootstrap-146vjsckowoo9/s-f2ljfyfeao-lexvjc-2cm8xlrxnbnm8
126680 ./obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/deps
107668 ./obj/build/x86_64-unkno6510885
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_fold:start:after_failure.4
travis_time:start:034330f0
$ head -30 ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
head: cannot open ‘./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers’ for reading: No such file or directory
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:1ff943d0
$ 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)

rust-highfive · 2018-07-05T23:33:55Z

The job x86_64-gnu-llvm-3.9 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.

    100% |████████████████████████████████| 51kB 8.7MB/s 
Collecting botocore==1.10.51 (from awscli)
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading https://files.pythonhosted.org/packages/e3/ba/f6c9220d87784a85f24a8f2425edccb2f330d15c304ea2373ed8206a03ca/botocore-1.10.51-py2.py3-none-any.whl (4.4MB)
    0% |                                | 10kB 42.7MB/s eta 0:00:01
    0% |▏                               | 20kB 22.9MB/s eta 0:00:01
    0% |▎                               | 30kB 24.8MB/s eta 0:00:01
    0% |▎                               | 40kB 23.2MB/s eta 0:00:01
---
[00:46:10] ....................................................................................................
[00:46:22] ....................................................................................................
[00:46:33] ....................................................................................................
[00:46:55] .....................................................................i..............................
[00:47:08] .............................................F......................................................
[00:47:23] ...i............................F..........................................................i........
[00:47:37] ...........................................................................test [run-pass] run-pass/issue-29227.rs has been running for over 60 seconds
[00:48:06] ....................................................................................................
[00:48:21] ....................................................................................................
[00:48:37] .....................................................................i..............................
[00:48:51] ....................................................................i...............................
---
[00:51:27] ---- [run-pass] run-pass/issue-37109.rs stdout ----
[00:51:27] 
[00:51:27] error: compilation failed!
[00:51:27] status: exit code: 101
[00:51:27] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass/issue-37109.rs" "--target=x86_64-unknown-linux-gnu" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/issue-37109/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/issue-37109/auxiliary"
[00:51:27] ------------------------------------------
[00:51:27] 
[00:51:27] ------------------------------------------
[00:51:27] stderr:
[00:51:27] stderr:
[00:51:27] ------------------------------------------
[00:51:27] thread 'main' panicked at 'region_obligations not empty: [
[00:51:27]         NodeId(
[00:51:27]             0
[00:51:27]         ),
[00:51:27]         ),
[00:51:27]         RegionObligation(sub_region=ReFree(DefId(0/0:7 ~ issue_37109[317d]::example[0]), BrNamed(crate0:DefIndex(1:12), 'a)), sup_type=&'a T)
[00:51:27]     )
[00:51:27] ]', librustc/infer/mod.rs:1031:9
[00:51:27] 
[00:51:27] error: internal compiler error: unexpected panic
[00:51:27] 
[00:51:27] 
[00:51:27] note: the compiler unexpectedly panicked. this is a bug.
[00:51:27] 
[00:51:27] note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
[00:51:27] note: rustc 1.29.0-dev running on x86_64-unknown-linux-gnu
[00:51:27] 
[00:51:27] 
[00:51:27] note: compiler flags: -Z unstable-options -C prefer-dynamic -C rpath
[00:51:27] 
[00:51:27] ------------------------------------------
[00:51:27] 
[00:51:27] thread '[run-pass] run-pass/issue-37109.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3140:9
[00:51:27] thread '[run-pass] run-pass/issue-37109.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3140:9
[00:51:27] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[00:51:27] 
[00:51:27] ---- [run-pass] run-pass/issue-42552.rs stdout ----
[00:51:27] 
[00:51:27] error: compilation failed!
[00:51:27] status: exit code: 101
[00:51:27] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/run-pass/issue-42552.rs" "--target=x86_64-unknown-linux-gnu" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-pass/issue-42552/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/issue-42552/auxiliary"
[00:51:27] ------------------------------------------
[00:51:27] 
[00:51:27] ------------------------------------------
[00:51:27] stderr:
[00:51:27] stderr:
[00:51:27] ------------------------------------------
[00:51:27] thread 'main' panicked at 'region_obligations not empty: [
[00:51:27]         NodeId(
[00:51:27]             0
[00:51:27]         ),
[00:51:27]         ),
[00:51:27]         RegionObligation(sub_region='_#10r, sup_type=i32)
[00:51:27]     )
[00:51:27] ]', librustc/infer/mod.rs:1031:9
[00:51:27] 
[00:51:27] error: internal compiler error: unexpected panic
[00:51:27] 
[00:51:27] 
[00:51:27] note: the compiler unexpectedly panicked. this is a bug.
[00:51:27] 
[00:51:27] note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
[00:51:27] note: rustc 1.29.0-dev running on x86_64-unknown-linux-gnu
[00:51:27] 
[00:51:27] 
[00:51:27] note: compiler flags: -Z unstable-options -C prefer-dynamic -C rpath
[00:51:27] 
[00:51:27] ------------------------------------------
[00:51:27] 
[00:51:27] thread '[run-pass] run-pass/issue-42552.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3140:9

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)

bors · 2018-07-07T02:00:58Z

☔ The latest upstream changes (presumably #52021) made this pull request unmergeable. Please resolve the merge conflicts.

nikomatsakis · 2018-07-18T19:02:58Z

Ugh. Rebased, but travis is reporting a new failure. On the bright side, this turns out to fix some other problems we were encountering (#52078)

rust-highfive · 2018-07-18T20:08:28Z

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.

[00:40:58] ....................................................................................................
[00:41:01] ....................................................................................................
[00:41:04] ....................................................................................................
[00:41:06] .......................................i............................................................
[00:41:08] ...............................................F....................................................
[00:41:13] ....................................................................................................
[00:41:16] ....................................................................................................
[00:41:19] ....................................................................................................
[00:41:21] ....................................................................................................
---
[00:41:43] 
[00:41:43] + error[E0308]: mismatched types
[00:41:43] +   --> $DIR/issue-20831-debruijn.rs:38:5
[00:41:43] +    |
[00:41:43] + LL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
[00:41:43] + LL | |         // Not obvious, but there is an implicit lifetime here -------^
[00:41:43] + LL | |         //~^^ ERROR cannot infer
[00:41:43] + LL | |         //
[00:41:43] + ...  |
[00:41:43] + LL | |         self.sub = t;
[00:41:43] + LL | |     }
[00:41:43] +    | |_____^ lifetime mismatch
[00:41:43] +    = note: expected type `'a`
[00:41:43] +               found type ``
[00:41:43] +               found type ``
[00:41:43] + note: the anonymous lifetime #2 defined on the method body at 38:5...
[00:41:43] +   --> $DIR/issue-20831-debruijn.rs:38:5
[00:41:43] +    |
[00:41:43] + LL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
[00:41:43] + LL | |         // Not obvious, but there is an implicit lifetime here -------^
[00:41:43] + LL | |         //~^^ ERROR cannot infer
[00:41:43] + LL | |         //
[00:41:43] + ...  |
[00:41:43] + LL | |         self.sub = t;
[00:41:43] + LL | |     }
[00:41:43] +    | |_____^
[00:41:43] + note: ...does not necessarily outlive the lifetime 'a as defined on the impl at 36:6
[00:41:43] +   --> $DIR/issue-20831-debruijn.rs:36:6
[00:41:43] +    |
[00:41:43] + LL | impl<'a> Publisher<'a> for MyStruct<'a> {
[00:41:43] + 
[00:41:43] + error[E0308]: mismatched types
[00:41:43] +   --> $DIR/issue-20831-debruijn.rs:38:5
[00:41:43] +    |
[00:41:43] +    |
[00:41:43] + LL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
[00:41:43] + LL | |         // Not obvious, but there is an implicit lifetime here -------^
[00:41:43] + LL | |         //~^^ ERROR cannot infer
[00:41:43] + LL | |         //
[00:41:43] + ...  |
[00:41:43] + LL | |         self.sub = t;
[00:41:43] + LL | |     }
[00:41:43] +    | |_____^ lifetime mismatch
[00:41:43] +    = note: expected type `'a`
[00:41:43] +               found type ``
[00:41:43] +               found type ``
[00:41:43] + note: the lifetime 'a as defined on the impl at 36:6...
[00:41:43] +   --> $DIR/issue-20831-debruijn.rs:36:6
[00:41:43] +    |
[00:41:43] + LL | impl<'a> Publisher<'a> for MyStruct<'a> {
[00:41:43] +    |      ^^
[00:41:43] + note: ...does not necessarily outlive the anonymous lifetime #2 defined on the method body at 38:5
[00:41:43] +   --> $DIR/issue-20831-debruijn.rs:38:5
[00:41:43] +    |
[00:41:43] + LL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
[00:41:43] + LL | |         // Not obvious, but there is an implicit lifetime here -------^
[00:41:43] + LL | |         //~^^ ERROR cannot infer
[00:41:43] + LL | |         //
[00:41:43] + ...  |
[00:41:43] + LL | |         self.sub = t;
[00:41:43] + LL | |     }
L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20831-debruijn/auxiliary" "-A" "unused"
[00:41:43] ------------------------------------------
[00:41:43] 
[00:41:43] ------------------------------------------
[00:41:43] stderr:
[00:41:43] stderr:
[00:41:43] ------------------------------------------
[00:41:43] {"message":"mismatched types","code":{"code":"E0308","explanation":"\nThis error occurs when the compiler was unable to infer the concrete type of a\nvariable. It can occur for several cases, the most common of which is a\nmismatch in the expected type that the compiler inferred for a variable's\ninitializing expression, and the actual type explicitly assigned to the\nvariable.\n\nFor example:\n\n```compile_fail,E0308\nlet x: i32 = \"I am not a number!\";\n//     ~~~   ~~~~~~~~~~~~~~~~~~~~\n//      |             |\n//      |    initializing expression;\n//      |    compiler infers type `&str`\n//      |\n//    type `i32` assigned to variable `x`\n```\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1159,"byte_end":1555,"line_start":38,"line_end":46,"column_start":5,"column_end":6,"is_primary":true,"text":[{"text":"    fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {","highlight_start":5,"highlight_end":91},{"text":"        // Not obvious, but there is an implicit lifetime here -------^","highlight_start":1,"highlight_end":72},{"text":"        //~^^ ERROR cannot infer","highlight_start":1,"highlight_end":33},{"text":"        //","highlight_start":1,"highlight_end":11},{"text":"        // The fact that `Publisher` is using an implicit lifetime is","highlight_start":1,"highlight_end":70},{"text":"        // what was causing the debruijn accounting to be off, so","highlight_start":1,"highlight_end":66},{"text":"        // leave it that way!","highlight_start":1,"highlight_end":30},{"text":"        self.sub = t;","highlight_start":1,"highlight_end":22},{"text":"    }","highlight_start":1,"highlight_end":6}],"label":"lifetime mismatch","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"expected type `'a`\n   found type ``","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"the anonymous lifetime #2 defined on the method body at 38:5...","code":null,"level":"note","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1159,"byte_end":1555,"line_start":38,"line_end":46,"column_start":5,"column_end":6,"is_primary":true,"text":[{"text":"    fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {","highlight_start":5,"highlight_end":91},{"text":"        // Not obvious, but there is an implicit lifetime here -------^","highlight_start":1,"highlight_end":72},{"text":"        //~^^ ERROR cannot infer","highlight_start":1,"highlight_end":33},{"text":"        //","highlight_start":1,"highlight_end":11},{"text":"        // The fact that `Publisher` is using an implicit lifetime is","highlight_start":1,"highlight_end":70},{"text":"        // what was causing the debruijn accounting to be off, so","highlight_start":1,"highlight_end":66},{"text":"        // leave it that way!","highlight_start":1,"highlight_end":30},{"text":"        self.sub = t;","highlight_start":1,"highlight_end":22},{"text":"    }","highlight_start":1,"highlight_end":6}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null},{"message":"...does not necessarily outlive the lifetime 'a as defined on the impl at 36:6","code":null,"level":"note","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1095,"byte_end":1097,"line_start":36,"line_end":36,"column_start":6,"column_end":8,"is_primary":true,"text":[{"text":"impl<'a> Publisher<'a> for MyStruct<'a> {","highlight_start":6,"highlight_end":8}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null}],"rendered":"error[E0308]: mismatched types\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:38:5\n   |\nLL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {\nLL | |         // Not obvious, but there is an implicit lifetime here -------^\nLL | |         //~^^ ERROR cannot infer\nLL | |         //\n...  |\nLL | |         self.sub = t;\nLL | |     }\n   | |_____^ lifetime mismatch\n   |\n   = note: expected type `'a`\n              found type ``\nnote: the anonymous lifetime #2 defined on the method body at 38:5...\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:38:5\n   |\nLL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {\nLL | |         // Not obvious, but there is an implicit lifetime here -------^\nLL | |         //~^^ ERROR cannot infer\nLL | |         //\n...  |\nLL | |         self.sub = t;\nLL | |     }\n   | |_____^\nnote: ...does not necessarily outlive the lifetime 'a as defined on the impl at 36:6\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:36:6\n   |\nLL | impl<'a> Publisher<'a> for MyStruct<'a> {\n   |      ^^\n\n"}
[00:41:43] {"message":"mismatched types","code":{"code":"E0308","explanation":"\nThis error occurs when the compiler was unable to infer the concrete type of a\nvariable. It can occur for several cases, the most common of which is a\nmismatch in the expected type that the compiler inferred for a variable's\ninitializing expression, and the actual type explicitly assigned to the\nvariable.\n\nFor example:\n\n```compile_fail,E0308\nlet x: i32 = \"I am not a number!\";\n//     ~~~   ~~~~~~~~~~~~~~~~~~~~\n//      |             |\n//      |    initializing expression;\n//      |    compiler infers type `&str`\n//      |\n//    type `i32` assigned to variable `x`\n```\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1159,"byte_end":1555,"line_start":38,"line_end":46,"column_start":5,"column_end":6,"is_primary":true,"text":[{"text":"    fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {","highlight_start":5,"highlight_end":91},{"text":"        // Not obvious, but there is an implicit lifetime here -------^","highlight_start":1,"highlight_end":72},{"text":"        //~^^ ERROR cannot infer","highlight_start":1,"highlight_end":33},{"text":"        //","highlight_start":1,"highlight_end":11},{"text":"        // The fact that `Publisher` is using an implicit lifetime is","highlight_start":1,"highlight_end":70},{"text":"        // what was causing the debruijn accounting to be off, so","highlight_start":1,"highlight_end":66},{"text":"        // leave it that way!","highlight_start":1,"highlight_end":30},{"text":"        self.sub = t;","highlight_start":1,"highlight_end":22},{"text":"    }","highlight_start":1,"highlight_end":6}],"label":"lifetime mismatch","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"expected type `'a`\n   found type ``","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"the lifetime 'a as defined on the impl at 36:6...","code":null,"level":"note","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1095,"byte_end":1097,"line_start":36,"line_end":36,"column_start":6,"column_end":8,"is_primary":true,"text":[{"text":"impl<'a> Publisher<'a> for MyStruct<'a> {","highlight_start":6,"highlight_end":8}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null},{"message":"...does not necessarily outlive the anonymous lifetime #2 defined on the method body at 38:5","code":null,"level":"note","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1159,"byte_end":1555,"line_start":38,"line_end":46,"column_start":5,"column_end":6,"is_primary":true,"text":[{"text":"    fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {","highlight_start":5,"highlight_end":91},{"text":"        // Not obvious, but there is an implicit lifetime here -------^","highlight_start":1,"highlight_end":72},{"text":"        //~^^ ERROR cannot infer","highlight_start":1,"highlight_end":33},{"text":"        //","highlight_start":1,"highlight_end":11},{"text":"        // The fact that `Publisher` is using an implicit lifetime is","highlight_start":1,"highlight_end":70},{"text":"        // what was causing the debruijn accounting to be off, so","highlight_start":1,"highlight_end":66},{"text":"        // leave it that way!","highlight_start":1,"highlight_end":30},{"text":"        self.sub = t;","highlight_start":1,"highlight_end":22},{"text":"    }","highlight_start":1,"highlight_end":6}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null}],"rendered":"error[E0308]: mismatched types\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:38:5\n   |\nLL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {\nLL | |         // Not obvious, but there is an implicit lifetime here -------^\nLL | |         //~^^ ERROR cannot infer\nLL | |         //\n...  |\nLL | |         self.sub = t;\nLL | |     }\n   | |_____^ lifetime mismatch\n   |\n   = note: expected type `'a`\n              found type ``\nnote: the lifetime 'a as defined on the impl at 36:6...\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:36:6\n   |\nLL | impl<'a> Publisher<'a> for MyStruct<'a> {\n   |      ^^\nnote: ...does not necessarily outlive the anonymous lifetime #2 defined on the method body at 38:5\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:38:5\n   |\nLL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {\nLL | |         // Not obvious, but there is an implicit lifetime here -------^\nLL | |         //~^^ ERROR cannot infer\nLL | |         //\n...  |\nLL | |         self.sub = t;\nLL | |     }\n   | |_____^\n\n"}
[00:41:43] {"message":"cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements","code":{"code":"E0495","explanation":null},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1159,"byte_end":1555,"line_start":38,"line_end":46,"column_start":5,"column_end":6,"is_primary":true,"text":[{"text":"    fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {","highlight_start":5,"highlight_end":91},{"text":"        // Not obvious, but there is an implicit lifetime here -------^","highlight_start":1,"highlight_end":72},{"text":"        //~^^ ERROR cannot infer","highlight_start":1,"highlight_end":33},{"text":"        //","highlight_start":1,"highlight_end":11},{"text":"        // The fact that `Publisher` is using an implicit lifetime is","highlight_start":1,"highlight_end":70},{"text":"        // what was causing the debruijn accounting to be off, so","highlight_start":1,"highlight_end":66},{"text":"        // leave it that way!","highlight_start":1,"highlight_end":30},{"text":"        self.sub = t;","highlight_start":1,"highlight_end":22},{"text":"    }","highlight_start":1,"highlight_end":6}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"first, the lifetime cannot outlive the anonymous lifetime #2 defined on the method body at 38:5...","code":null,"level":"note","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1159,"byte_end":1555,"line_start":38,"line_end":46,"column_start":5,"column_end":6,"is_primary":true,"text":[{"text":"    fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {","highlight_start":5,"highlight_end":91},{"text":"        // Not obvious, but there is an implicit lifetime here -------^","highlight_start":1,"highlight_end":72},{"text":"        //~^^ ERROR cannot infer","highlight_start":1,"highlight_end":33},{"text":"        //","highlight_start":1,"highlight_end":11},{"text":"        // The fact that `Publisher` is using an implicit lifetime is","highlight_start":1,"highlight_end":70},{"text":"        // what was causing the debruijn accounting to be off, so","highlight_start":1,"highlight_end":66},{"text":"        // leave it that way!","highlight_start":1,"highlight_end":30},{"text":"        self.sub = t;","highlight_start":1,"highlight_end":22},{"text":"    }","highlight_start":1,"highlight_end":6}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null},{"message":"...but the lifetime must also be valid for the lifetime 'a as defined on the impl at 36:6...","code":null,"level":"note","spans":[{"file_name":"/checkout/src/test/ui/issue-20831-debruijn.rs","byte_start":1095,"byte_end":1097,"line_start":36,"line_end":36,"column_start":6,"column_end":8,"is_primary":true,"text":[{"text":"impl<'a> Publisher<'a> for MyStruct<'a> {","highlight_start":6,"highlight_end":8}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null},{"message":"...so that the types are compatible:\nexpected Publisher<'_>\n   found Publisher<'_>","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:38:5\n   |\nLL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {\nLL | |         // Not obvious, but there is an implicit lifetime here -------^\nLL | |         //~^^ ERROR cannot infer\nLL | |         //\n...  |\nLL | |         self.sub = t;\nLL | |     }\n   | |_____^\n   |\nnote: first, the lifetime cannot outlive the anonymous lifetime #2 defined on the method body at 38:5...\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:38:5\n   |\nLL | /     fn subscribe(&mut self, t : Box<Subscriber<Input=<Self as Publisher>::Output> + 'a>) {\nLL | |         // Not obvious, but there is an implicit lifetime here -------^\nLL | |         //~^^ ERROR cannot infer\nLL | |         //\n...  |\nLL | |         self.sub = t;\nLL | |     }\n   | |_____^\nnote: ...but the lifetime must also be valid for the lifetime 'a as defined on the impl at 36:6...\n  --> /checkout/src/test/ui/issue-20831-debruijn.rs:36:6\n   |\nLL | impl<'a> Publisher<'a> for MyStruct<'a> {\n   |      ^^\n   = note: ...so that the types are compatible:\n           expected Publisher<'_>\n              found Publisher<'_>\n\n"}
[00:41:43] thread 'main' panicked at 'Some tests failed', tools/compiletest/src/main.rs:498:22
[00:41:43] {"message":"aborting due to 3 previous errors","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to 3 previous errors\n\n"}
[00:41:43] {"message":"Some errors occurred: E0308, E0495.","code":null,"level":"","spans":[],"children":[],"rendered":"Some errors occurred: E0308, E0495.\n"}
[00:41:43] {"message":"For more information about an error, try `rustc --explain E0308`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about an error, try `rustc --explain E0308`.\n"}
[00:41:43] ------------------------------------------
[00:41:43] 
[00:41:43] thread '[ui] ui/issue-20831-debruijn.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:41:43] note: Run with `RUST_BACKTRACE=1` for a backtrace.
---
[00:41:43] test result: FAILED. 2110 passed; 1 failed; 7 ignored; 0 measured; 0 filtered out
[00:41:43] 
[00:41:43] 
[00:41:43] 
[00:41:43] 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/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "s

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:028be3b1
$ 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)

nikomatsakis · 2018-07-19T18:19:29Z

@bors r+

bors · 2018-07-20T13:33:07Z

☔ The latest upstream changes (presumably #52476) made this pull request unmergeable. Please resolve the merge conflicts.

Fixes rust-lang#52078

These new errors actually seem a *tad* clearer than the old one, so that's good, but now there are 3. Maybe call it a wash?

nikomatsakis · 2018-07-21T12:57:13Z

Rebased.

nikomatsakis · 2018-07-21T12:57:26Z

@bors r+

bors · 2018-07-21T12:57:26Z

📌 Commit 0d8f3b3 has been approved by nikomatsakis

bors · 2018-07-21T18:51:20Z

⌛ Testing commit 0d8f3b3 with merge d941658...

@nikomatsakis

…sakis Turn implied_outlives_bounds into a query Right now all this does is remove the error reporting in `implied_outlives_bounds`, which seems to work. Farming out full tests to Travis. For #51649. That issue is deferred so not sure what's next. r? @nikomatsakis

bors · 2018-07-21T21:01:12Z

☀️ Test successful - status-appveyor, status-travis
Approved by: nikomatsakis
Pushing d941658 to master...

rust-highfive assigned nikomatsakis Jul 1, 2018

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

tmandry 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 Jul 1, 2018

tmandry force-pushed the make-implied-outlives-query branch 2 times, most recently from f692035 to 4bcb7ff Compare July 4, 2018 18:12

tmandry force-pushed the make-implied-outlives-query branch from 4bcb7ff to 24b795a Compare July 4, 2018 18:34

tmandry changed the title ~~[WIP] Turn implied_outlives_bounds into a query~~ Turn implied_outlives_bounds into a query Jul 4, 2018

tmandry force-pushed the make-implied-outlives-query branch from 24b795a to 02cf3ac Compare July 5, 2018 22:40

nikomatsakis force-pushed the make-implied-outlives-query branch from 02cf3ac to 3794e27 Compare July 18, 2018 18:57

nikomatsakis mentioned this pull request Jul 18, 2018

NLL: Implied bounds computation misses some relationships #52078

Closed

nikomatsakis force-pushed the make-implied-outlives-query branch from 27a03db to 86fa26b Compare July 19, 2018 04:19

tmandry and others added 4 commits July 21, 2018 15:56

Convert implied_outlives_bounds to a query

e5286d9

skip no-op obligations and add a little debug output

0b88103

add regression test for rust-lang#52078

596ff12

Fixes rust-lang#52078

use proper body-id and span when solving obligations

0e47a4a

we now get 2 extra mismatched type errors

0d8f3b3

These new errors actually seem a *tad* clearer than the old one, so that's good, but now there are 3. Maybe call it a wash?

nikomatsakis force-pushed the make-implied-outlives-query branch from 86fa26b to 0d8f3b3 Compare July 21, 2018 12:57

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 21, 2018

bors mentioned this pull request Jul 21, 2018

Rollup of bare_trait_objects PRs #52336

Merged

bors merged commit 0d8f3b3 into rust-lang:master Jul 21, 2018

nikomatsakis mentioned this pull request Jul 25, 2018

NLL ICE: "unresolved inference variable in outlives" #52057

Closed

Jules-Bertholet mentioned this pull request Sep 16, 2025

#[unsafe(no_mangle)] erroneously accepted inside thread_local! #146557

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