Add long error explanation for E0495 #64404

GuillaumeGomez · 2019-09-12T13:01:19Z

Part of #61137.

rust-highfive · 2019-09-12T13:01:22Z

Some changes occurred in diagnostic error codes

cc @GuillaumeGomez

rust-highfive · 2019-09-12T13:01:23Z

r? @cramertj

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

cramertj · 2019-09-12T16:11:01Z

src/librustc/error_codes.rs

+Erroneous code example:
+
+```compile_fail,E0495
+fn transmute_lifetime<'a, 'b, T>(t: &'a (T,)) -> &'b T {


Is the single-field tuple necessary here? and the match (could it be a let)? It seems like they're adding extra confusion

I think you're right, I was too focused on simplifying the lifetime change.

cramertj · 2019-09-12T16:12:35Z

src/librustc/error_codes.rs

+let x = transmute_lifetime(&y);
+```
+
+In this code, you have two ways to solve this issue:


I'm not sure whether this example is representative of the majority of places where users encounter this error-- if users are hitting an error due to mismatched lifetimes, IME it's rare that it's easily solvable by just adding a bound in one location.

Do you have another example in mind by any chance? Maybe another example would be the best thing to do to avoid confusing users.

I don't have an easy one that would be representative offhand, sorry. There are a number of things I've seen cause this error, and I don't have a good idea which is the most important to cover, nor what broader categories issues fall into.

JohnCSimon · 2019-09-21T01:55:46Z

Ping from triage.
@cramertj Can you address the question above?
cc: @GuillaumeGomez
Thanks.

bors · 2019-09-21T18:23:40Z

☔ The latest upstream changes (presumably #64658) made this pull request unmergeable. Please resolve the merge conflicts.

Dylan-DPC-zz · 2019-09-24T15:59:11Z

@GuillaumeGomez can you rebase this? looks good to me

rust-highfive · 2019-09-25T10:56:18Z

The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, 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.

2019-09-25T09:40:04.5191055Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-09-25T09:40:04.5402478Z ##[command]git config gc.auto 0
2019-09-25T09:40:04.5490285Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-09-25T09:40:04.5557827Z ##[command]git config --get-all http.proxy
2019-09-25T09:40:04.5722778Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/64404/merge:refs/remotes/pull/64404/merge
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---
2019-09-25T10:56:12.7876615Z 61 
2019-09-25T10:56:12.7876653Z 
2019-09-25T10:56:12.7876679Z 
2019-09-25T10:56:12.7876756Z The actual stderr differed from the expected stderr.
2019-09-25T10:56:12.7877527Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/regions/regions-nested-fns/regions-nested-fns.stderr
2019-09-25T10:56:12.7877819Z To update references, rerun the tests and pass the `--bless` flag
2019-09-25T10:56:12.7878119Z To only update this specific test, also pass `--test-args regions/regions-nested-fns.rs`
2019-09-25T10:56:12.7878200Z error: 1 errors occurred comparing output.
2019-09-25T10:56:12.7878246Z status: exit code: 1
2019-09-25T10:56:12.7878246Z status: exit code: 1
2019-09-25T10:56:12.7879242Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/regions/regions-nested-fns.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/regions/regions-nested-fns" "-Crpath" "-O" "-Cdebuginfo=0" "-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/ui/regions/regions-nested-fns/auxiliary" "-A" "unused"
2019-09-25T10:56:12.7879933Z ------------------------------------------
2019-09-25T10:56:12.7879966Z 
2019-09-25T10:56:12.7880174Z ------------------------------------------
2019-09-25T10:56:12.7880232Z stderr:
2019-09-25T10:56:12.7880232Z stderr:
2019-09-25T10:56:12.7880436Z ------------------------------------------
2019-09-25T10:56:12.7880486Z error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
2019-09-25T10:56:12.7880734Z   --> /checkout/src/test/ui/regions/regions-nested-fns.rs:5:18
2019-09-25T10:56:12.7880782Z    |
2019-09-25T10:56:12.7880824Z LL |     let mut ay = &y; //~ ERROR E0495
2019-09-25T10:56:12.7880923Z    |
2019-09-25T10:56:12.7880923Z    |
2019-09-25T10:56:12.7880972Z note: first, the lifetime cannot outlive the anonymous lifetime #2 defined on the body at 7:58...
2019-09-25T10:56:12.7881285Z    |
2019-09-25T10:56:12.7881285Z    |
2019-09-25T10:56:12.7881515Z LL |       ignore::<Box<dyn for<'z> FnMut(&'z isize)>>(Box::new(|z| {
2019-09-25T10:56:12.7881565Z    |  __________________________________________________________^
2019-09-25T10:56:12.7881624Z LL | |         ay = x;
2019-09-25T10:56:12.7881664Z LL | |         ay = &y;
2019-09-25T10:56:12.7881705Z LL | |         ay = z;
2019-09-25T10:56:12.7881760Z LL | |     }));
2019-09-25T10:56:12.7881844Z note: ...so that reference does not outlive borrowed content
2019-09-25T10:56:12.7882093Z   --> /checkout/src/test/ui/regions/regions-nested-fns.rs:10:14
2019-09-25T10:56:12.7882137Z    |
2019-09-25T10:56:12.7882137Z    |
2019-09-25T10:56:12.7882174Z LL |         ay = z;
2019-09-25T10:56:12.7882214Z    |              ^
2019-09-25T10:56:12.7882281Z note: but, the lifetime must be valid for the anonymous lifetime #2 defined on the body at 13:72...
2019-09-25T10:56:12.7882575Z    |
2019-09-25T10:56:12.7882575Z    |
2019-09-25T10:56:12.7882831Z LL |       ignore::< Box<dyn for<'z> FnMut(&'z isize) -> &'z isize>>(Box::new(|z| {
2019-09-25T10:56:12.7882884Z    |  ________________________________________________________________________^
2019-09-25T10:56:12.7882932Z LL | |         if false { return x; } //~ ERROR E0312
2019-09-25T10:56:12.7882993Z LL | |         if false { return ay; }
2019-09-25T10:56:12.7883034Z LL | |         return z;
2019-09-25T10:56:12.7883073Z LL | |     }));
2019-09-25T10:56:12.7883170Z    = note: ...so that the types are compatible:
2019-09-25T10:56:12.7883170Z    = note: ...so that the types are compatible:
2019-09-25T10:56:12.7883213Z            expected &isize
2019-09-25T10:56:12.7883254Z               found &isize
2019-09-25T10:56:12.7883300Z 
2019-09-25T10:56:12.7883344Z error[E0312]: lifetime of reference outlives lifetime of borrowed content...
2019-09-25T10:56:12.7883830Z    |
2019-09-25T10:56:12.7883830Z    |
2019-09-25T10:56:12.7883872Z LL |         if false { return x; } //~ ERROR E0312
2019-09-25T10:56:12.7884044Z    |
2019-09-25T10:56:12.7884044Z    |
2019-09-25T10:56:12.7884280Z note: ...the reference is valid for the anonymous lifetime #2 defined on the body at 13:72...
2019-09-25T10:56:12.7884559Z    |
2019-09-25T10:56:12.7884559Z    |
2019-09-25T10:56:12.7884813Z LL |       ignore::< Box<dyn for<'z> FnMut(&'z isize) -> &'z isize>>(Box::new(|z| {
2019-09-25T10:56:12.7884865Z    |  ________________________________________________________________________^
2019-09-25T10:56:12.7884913Z LL | |         if false { return x; } //~ ERROR E0312
2019-09-25T10:56:12.7884972Z LL | |         if false { return ay; }
2019-09-25T10:56:12.7885014Z LL | |         return z;
2019-09-25T10:56:12.7885053Z LL | |     }));
2019-09-25T10:56:12.7885109Z    | |_____^
2019-09-25T10:56:12.7885576Z note: ...but the borrowed content is only valid for the lifetime 'x as defined on the function body at 3:11
2019-09-25T10:56:12.7885919Z    |
2019-09-25T10:56:12.7885919Z    |
2019-09-25T10:56:12.7886723Z LL | fn nested<'x>(x: &'x isize) {
2019-09-25T10:56:12.7886806Z 
2019-09-25T10:56:12.7886870Z error: aborting due to 2 previous errors
2019-09-25T10:56:12.7886898Z 
2019-09-25T10:56:12.7886942Z Some errors have detailed explanations: E0312, E0495.
---
2019-09-25T10:56:12.7888894Z 110 
2019-09-25T10:56:12.7888920Z 
2019-09-25T10:56:12.7888946Z 
2019-09-25T10:56:12.7888990Z The actual stderr differed from the expected stderr.
2019-09-25T10:56:12.7889307Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/wf/wf-static-method/wf-static-method.stderr
2019-09-25T10:56:12.7889553Z To update references, rerun the tests and pass the `--bless` flag
2019-09-25T10:56:12.7890157Z To only update this specific test, also pass `--test-args wf/wf-static-method.rs`
2019-09-25T10:56:12.7890260Z error: 1 errors occurred comparing output.
2019-09-25T10:56:12.7890301Z status: exit code: 1
2019-09-25T10:56:12.7890301Z status: exit code: 1
2019-09-25T10:56:12.7891154Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/wf/wf-static-method.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/wf/wf-static-method" "-Crpath" "-O" "-Cdebuginfo=0" "-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/ui/wf/wf-static-method/auxiliary" "-A" "unused"
2019-09-25T10:56:12.7891486Z ------------------------------------------
2019-09-25T10:56:12.7891517Z 
2019-09-25T10:56:12.7891721Z ------------------------------------------
2019-09-25T10:56:12.7891760Z stderr:
2019-09-25T10:56:12.7891760Z stderr:
2019-09-25T10:56:12.7891974Z ------------------------------------------
2019-09-25T10:56:12.7892038Z error[E0312]: lifetime of reference outlives lifetime of borrowed content...
2019-09-25T10:56:12.7892258Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:17:9
2019-09-25T10:56:12.7892355Z LL |         u //~ ERROR E0312
2019-09-25T10:56:12.7892395Z    |         ^
2019-09-25T10:56:12.7892447Z    |
2019-09-25T10:56:12.7892447Z    |
2019-09-25T10:56:12.7892685Z note: ...the reference is valid for the lifetime 'a as defined on the impl at 14:6...
2019-09-25T10:56:12.7892899Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:14:6
2019-09-25T10:56:12.7892956Z    |
2019-09-25T10:56:12.7893160Z LL | impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () {
2019-09-25T10:56:12.7893201Z    |      ^^
2019-09-25T10:56:12.7893447Z note: ...but the borrowed content is only valid for the lifetime 'b as defined on the impl at 14:10
2019-09-25T10:56:12.7893694Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:14:10
2019-09-25T10:56:12.7893738Z    |
2019-09-25T10:56:12.7893940Z LL | impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () {
2019-09-25T10:56:12.7894226Z 
2019-09-25T10:56:12.7894265Z error[E0478]: lifetime bound not satisfied
2019-09-25T10:56:12.7894540Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:26:18
2019-09-25T10:56:12.7894582Z    |
2019-09-25T10:56:12.7894582Z    |
2019-09-25T10:56:12.7894625Z LL |         let me = Self::make_me(); //~ ERROR lifetime bound not satisfied
2019-09-25T10:56:12.7894723Z    |
2019-09-25T10:56:12.7894723Z    |
2019-09-25T10:56:12.7894964Z note: lifetime parameter instantiated with the lifetime 'b as defined on the impl at 23:10
2019-09-25T10:56:12.7895180Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:23:10
2019-09-25T10:56:12.7895236Z    |
2019-09-25T10:56:12.7895448Z LL | impl<'a, 'b> Foo<'a, 'b, ()> for IndirectEvil<'a, 'b> {
2019-09-25T10:56:12.7895490Z    |          ^^
2019-09-25T10:56:12.7895743Z note: but lifetime parameter must outlive the lifetime 'a as defined on the impl at 23:6
2019-09-25T10:56:12.7895970Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:23:6
2019-09-25T10:56:12.7896018Z    |
2019-09-25T10:56:12.7896842Z LL | impl<'a, 'b> Foo<'a, 'b, ()> for IndirectEvil<'a, 'b> {
2019-09-25T10:56:12.7896923Z 
2019-09-25T10:56:12.7896923Z 
2019-09-25T10:56:12.7896969Z error[E0312]: lifetime of reference outlives lifetime of borrowed content...
2019-09-25T10:56:12.7897230Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:33:9
2019-09-25T10:56:12.7897318Z LL |         u //~ ERROR E0312
2019-09-25T10:56:12.7897376Z    |         ^
2019-09-25T10:56:12.7897417Z    |
2019-09-25T10:56:12.7897417Z    |
2019-09-25T10:56:12.7897679Z note: ...the reference is valid for the lifetime 'a as defined on the impl at 31:6...
2019-09-25T10:56:12.7897936Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:31:6
2019-09-25T10:56:12.7897983Z    |
2019-09-25T10:56:12.7898190Z LL | impl<'a, 'b> Evil<'a, 'b> {
2019-09-25T10:56:12.7898234Z    |      ^^
2019-09-25T10:56:12.7898536Z note: ...but the borrowed content is only valid for the lifetime 'b as defined on the impl at 31:10
2019-09-25T10:56:12.7898786Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:31:10
2019-09-25T10:56:12.7898832Z    |
2019-09-25T10:56:12.7899054Z LL | impl<'a, 'b> Evil<'a, 'b> {
2019-09-25T10:56:12.7899129Z 
2019-09-25T10:56:12.7899129Z 
2019-09-25T10:56:12.7899411Z error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'b` due to conflicting requirements
2019-09-25T10:56:12.7899671Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:41:5
2019-09-25T10:56:12.7899717Z    |
2019-09-25T10:56:12.7899925Z LL |     <()>::static_evil(b) //~ ERROR cannot infer an appropriate lifetime
2019-09-25T10:56:12.7900021Z    |
2019-09-25T10:56:12.7900021Z    |
2019-09-25T10:56:12.7900270Z note: first, the lifetime cannot outlive the lifetime 'b as defined on the function body at 40:13...
2019-09-25T10:56:12.7900505Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:40:13
2019-09-25T10:56:12.7900546Z    |
2019-09-25T10:56:12.7900762Z LL | fn evil<'a, 'b>(b: &'b u32) -> &'a u32 {
2019-09-25T10:56:12.7900864Z note: ...so that reference does not outlive borrowed content
2019-09-25T10:56:12.7901079Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:41:23
2019-09-25T10:56:12.7901134Z    |
2019-09-25T10:56:12.7901134Z    |
2019-09-25T10:56:12.7901176Z LL |     <()>::static_evil(b) //~ ERROR cannot infer an appropriate lifetime
2019-09-25T10:56:12.7901219Z    |                       ^
2019-09-25T10:56:12.7901469Z note: but, the lifetime must be valid for the lifetime 'a as defined on the function body at 40:9...
2019-09-25T10:56:12.7901702Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:40:9
2019-09-25T10:56:12.7901743Z    |
2019-09-25T10:56:12.7901940Z LL | fn evil<'a, 'b>(b: &'b u32) -> &'a u32 {
2019-09-25T10:56:12.7902042Z note: ...so that reference does not outlive borrowed content
2019-09-25T10:56:12.7902254Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:41:5
2019-09-25T10:56:12.7902490Z    |
2019-09-25T10:56:12.7902490Z    |
2019-09-25T10:56:12.7902541Z LL |     <()>::static_evil(b) //~ ERROR cannot infer an appropriate lifetime
2019-09-25T10:56:12.7902610Z 
2019-09-25T10:56:12.7902610Z 
2019-09-25T10:56:12.7902922Z error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'b` due to conflicting requirements
2019-09-25T10:56:12.7903141Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:45:5
2019-09-25T10:56:12.7903181Z    |
2019-09-25T10:56:12.7903237Z LL |     <IndirectEvil>::static_evil(b)
2019-09-25T10:56:12.7903314Z    |
2019-09-25T10:56:12.7903314Z    |
2019-09-25T10:56:12.7903579Z note: first, the lifetime cannot outlive the lifetime 'b as defined on the function body at 44:22...
2019-09-25T10:56:12.7903797Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:44:22
2019-09-25T10:56:12.7903839Z    |
2019-09-25T10:56:12.7904061Z LL | fn indirect_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
2019-09-25T10:56:12.7904164Z note: ...so that reference does not outlive borrowed content
2019-09-25T10:56:12.7904397Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:45:33
2019-09-25T10:56:12.7904438Z    |
2019-09-25T10:56:12.7904438Z    |
2019-09-25T10:56:12.7904476Z LL |     <IndirectEvil>::static_evil(b)
2019-09-25T10:56:12.7904517Z    |                                 ^
2019-09-25T10:56:12.7904784Z note: but, the lifetime must be valid for the lifetime 'a as defined on the function body at 44:18...
2019-09-25T10:56:12.7905000Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:44:18
2019-09-25T10:56:12.7905040Z    |
2019-09-25T10:56:12.7905265Z LL | fn indirect_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
2019-09-25T10:56:12.7905348Z note: ...so that reference does not outlive borrowed content
2019-09-25T10:56:12.7905755Z   --> /checkout/src/test/ui/wf/wf-static-method.rs:45:5
2019-09-25T10:56:12.7905974Z    |
2019-09-25T10:56:12.7905974Z    |
2019-09-25T10:56:12.7906021Z LL |     <IndirectEvil>::static_evil(b)
2019-09-25T10:56:12.7906812Z 
2019-09-25T10:56:12.7906856Z error: aborting due to 5 previous errors
2019-09-25T10:56:12.7906883Z 
2019-09-25T10:56:12.7906944Z Some errors have detailed explanations: E0312, E0478, E0495.
---
2019-09-25T10:56:12.7925973Z thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:537:22
2019-09-25T10:56:12.7926730Z note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
2019-09-25T10:56:12.7942972Z 
2019-09-25T10:56:12.7943097Z 
2019-09-25T10:56:12.7945246Z 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" "stage2-x86_64-unknown-linux-gnu" "--mode" "ui" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-6.0/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0 -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" "6.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
2019-09-25T10:56:12.7945615Z 
2019-09-25T10:56:12.7945646Z 
2019-09-25T10:56:12.7957207Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
2019-09-25T10:56:12.7957699Z Build completed unsuccessfully in 1:08:47
2019-09-25T10:56:12.7957699Z Build completed unsuccessfully in 1:08:47
2019-09-25T10:56:12.8014163Z == clock drift check ==
2019-09-25T10:56:12.8047461Z   local time: Wed Sep 25 10:56:12 UTC 2019
2019-09-25T10:56:12.9521459Z   network time: Wed, 25 Sep 2019 10:56:12 GMT
2019-09-25T10:56:12.9521581Z == end clock drift check ==
2019-09-25T10:56:13.7209569Z ##[error]Bash exited with code '1'.
2019-09-25T10:56:13.7250153Z ##[section]Starting: Checkout
2019-09-25T10:56:13.7252743Z ==============================================================================
2019-09-25T10:56:13.7252795Z Task         : Get sources
2019-09-25T10:56:13.7252851Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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)

GuillaumeGomez · 2019-09-26T21:53:47Z

@Dylan-DPC Don't know what you did but that suddenly broke badly. :p I'll take a look tomorrow.

bors · 2019-09-29T10:00:10Z

☔ The latest upstream changes (presumably #64886) made this pull request unmergeable. Please resolve the merge conflicts.

GuillaumeGomez · 2019-09-30T13:51:30Z

Updated.

cramertj · 2019-09-30T17:51:00Z

@bors r+ rollup

Seems fine to land to me, thanks!

bors · 2019-09-30T17:51:01Z

📌 Commit 37b5efa has been approved by cramertj

Add long error explanation for E0495 Part of rust-lang#61137.

tmandry · 2019-09-30T21:28:53Z

Failed in #64927, @bors r-

GuillaumeGomez · 2019-10-01T11:56:11Z

I rebased and tests passed so I assume the error doesn't come from here but from its merge with another PR. Therefore this r- shouldn't be here.

@bors: r=cramertj rollup-

bors · 2019-10-01T11:56:12Z

📌 Commit be89e52 has been approved by cramertj

Centril · 2019-10-01T12:22:34Z

@bors retry rolled up.

Add long error explanation for E0495 Part of rust-lang#61137.

@ghost

Rollup of 5 pull requests Successful merges: - #63416 (apfloat: improve doc comments) - #64404 (Add long error explanation for E0495) - #64910 (syntax: cleanup param, method, and misc parsing) - #64912 (Remove unneeded `fn main` blocks from docs) - #64952 (Update cargo.) Failed merges: r? @ghost

tmandry · 2019-10-01T18:43:41Z

Failed in #64958. @bors r-

@GuillaumeGomez In general you can reproduce failures like this by running src/ci/docker/run.sh x86_64-gno-nopt on a machine with Docker (replace the argument with whichever job is failing). I did this, and realized that the failure was only occurring in nll compare mode. You should be able to reproduce with x.py test --compare-mode nll .... I'm not quite sure why this mode runs as part of some bors builders but not by default.

tl;dr I think you need to update the nll output.

pnkfelix · 2019-10-01T18:57:23Z

Hey @Centril maybe scenarios like this are a reason for us to remove compare-mode=nll ... or at least stop gating CI on it

GuillaumeGomez · 2019-10-01T19:32:43Z

@tmandry That explains why I couldn't reproduce. Thanks for the info! I'll update the PR tomorrow.

Centril · 2019-10-01T21:14:26Z

@pnkfelix we should probably inventory the reasons why we still use compare-mode=nll and then see if removing it would be safe (but that's for a different issue).

GuillaumeGomez · 2019-10-03T11:08:54Z

Updated btw.

bors · 2019-10-07T13:21:42Z

☔ The latest upstream changes (presumably #65178) made this pull request unmergeable. Please resolve the merge conflicts.

GuillaumeGomez · 2019-10-07T15:13:24Z

Updated.

Dylan-DPC-zz · 2019-10-08T09:56:00Z

@bors r+ rollup

bors · 2019-10-08T09:56:02Z

📌 Commit 96efaad has been approved by Dylan-DPC

Add long error explanation for E0495 Part of rust-lang#61137.

@ghost

Rollup of 8 pull requests Successful merges: - #64404 (Add long error explanation for E0495) - #64918 (Add long error explanation for E0551) - #65102 (Disable stack probe when thread sanitizer is enabled) - #65120 (Correctly estimate the required space for string in `StyledBuffer::prepend`) - #65145 (When suggesting assoc function with type params, include turbofish) - #65162 (Remove loaded_from_cache map from DepGraph) - #65176 (Remove query-related macros) - #65179 (Add long error explanation for E0567) Failed merges: r? @ghost

rust-highfive assigned cramertj Sep 12, 2019

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 12, 2019

GuillaumeGomez mentioned this pull request Sep 12, 2019

Add missing long error code explanations #61137

Closed

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cramertj reviewed Sep 12, 2019

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Dylan-DPC-zz 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 Sep 24, 2019

GuillaumeGomez force-pushed the err-E0495 branch from e17987f to 37b5efa Compare September 30, 2019 13:51

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 Sep 30, 2019

tmandry added a commit to tmandry/rust that referenced this pull request Sep 30, 2019

Rollup merge of rust-lang#64404 - GuillaumeGomez:err-E0495, r=cramertj

bb980a0

Add long error explanation for E0495 Part of rust-lang#61137.

tmandry mentioned this pull request Sep 30, 2019

Rollup of 7 pull requests #64927

Closed

bors 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 Sep 30, 2019

GuillaumeGomez force-pushed the err-E0495 branch from 37b5efa to be89e52 Compare October 1, 2019 11:48

Centril added a commit to Centril/rust that referenced this pull request Oct 1, 2019

Rollup merge of rust-lang#64404 - GuillaumeGomez:err-E0495, r=cramertj

fd6212a

Add long error explanation for E0495 Part of rust-lang#61137.

Centril mentioned this pull request Oct 1, 2019

Rollup of 5 pull requests #64958

Closed

bors 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 Oct 1, 2019

GuillaumeGomez force-pushed the err-E0495 branch from be89e52 to 9bf9aea Compare October 2, 2019 09:16

GuillaumeGomez force-pushed the err-E0495 branch from 9bf9aea to 7fb2820 Compare October 7, 2019 15:11

GuillaumeGomez added 2 commits October 7, 2019 17:12

Add long error explanation for E0495

28b0e1d

update ui tests

96efaad

GuillaumeGomez force-pushed the err-E0495 branch from 7fb2820 to 96efaad Compare October 7, 2019 15:13

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 Oct 8, 2019

Centril added a commit to Centril/rust that referenced this pull request Oct 8, 2019

Rollup merge of rust-lang#64404 - GuillaumeGomez:err-E0495, r=Dylan-DPC

71b6f77

Add long error explanation for E0495 Part of rust-lang#61137.

Centril mentioned this pull request Oct 8, 2019

Rollup of 5 pull requests #65203

Closed

Centril added a commit to Centril/rust that referenced this pull request Oct 8, 2019

Rollup merge of rust-lang#64404 - GuillaumeGomez:err-E0495, r=Dylan-DPC

6f211f1

Add long error explanation for E0495 Part of rust-lang#61137.

Centril mentioned this pull request Oct 8, 2019

Rollup of 8 pull requests #65209

Merged

bors merged commit 96efaad into rust-lang:master Oct 8, 2019

GuillaumeGomez deleted the err-E0495 branch October 9, 2019 08:03

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Add long error explanation for E0495 #64404

Add long error explanation for E0495 #64404

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Add long error explanation for E0495 #64404

Add long error explanation for E0495 #64404

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