Handle multiple error fix suggestions carefuly #67880

lbonn · 2020-01-05T00:07:12Z

The existing code seems to assume that substitutions spans are disjoint,
which is not always the case.

In the example:

pub trait AAAA {}
pub trait B {}
pub trait C {}
pub type T<P: AAAA + B + C> = P;

, we get three substituions starting from ':' and ending respectively at
the end of each trait token.

With the former offset calculation, this would cause underline_start to
eventually become negative before being converted to usize...

The new version may report erroneous results for non perfectly overlapping
substitutions but I don't know if such examples exist. Alternatively, we
could detect these cases and trim out overlapping substitutions.

Fixes #67690

rust-highfive · 2020-01-05T00:07:16Z

r? @petrochenkov

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

rust-highfive · 2020-01-05T01:05:28Z

The job x86_64-gnu-llvm-7 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.

2020-01-05T00:08:43.5229305Z ##[command]git remote add origin https://github.com/rust-lang/rust
2020-01-05T00:08:43.5436946Z ##[command]git config gc.auto 0
2020-01-05T00:08:43.5499319Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2020-01-05T00:08:43.5559740Z ##[command]git config --get-all http.proxy
2020-01-05T00:08:43.5701281Z ##[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/67880/merge:refs/remotes/pull/67880/merge
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---
2020-01-05T01:05:22.4260558Z diff of stderr:
2020-01-05T01:05:22.4260668Z 
2020-01-05T01:05:22.4260781Z 8 help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4260912Z 9    |
2020-01-05T01:05:22.4261024Z 10 LL | type SVec<T> = Vec<T>;
2020-01-05T01:05:22.4262134Z +    |           --
2020-01-05T01:05:22.4262330Z 12 
2020-01-05T01:05:22.4262483Z 13 warning: where clauses are not enforced in type aliases
2020-01-05T01:05:22.4262885Z 14   --> $DIR/type-alias-bounds.rs:10:21
2020-01-05T01:05:22.4262885Z 14   --> $DIR/type-alias-bounds.rs:10:21
2020-01-05T01:05:22.4263051Z 
2020-01-05T01:05:22.4263207Z 30 help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4263380Z 31    |
2020-01-05T01:05:22.4263760Z 32 LL | type VVec<'b, 'a> = (&'b u32, Vec<&'a i32>);
2020-01-05T01:05:22.4264823Z +    |                --
2020-01-05T01:05:22.4265010Z 34 
2020-01-05T01:05:22.4265581Z 35 warning: bounds on generic parameters are not enforced in type aliases
2020-01-05T01:05:22.4266088Z 36   --> $DIR/type-alias-bounds.rs:14:18
2020-01-05T01:05:22.4266088Z 36   --> $DIR/type-alias-bounds.rs:14:18
2020-01-05T01:05:22.4266240Z 
2020-01-05T01:05:22.4266998Z 41 help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4267312Z 42    |
2020-01-05T01:05:22.4268137Z 43 LL | type WVec<'b, T> = (&'b u32, Vec<T>);
2020-01-05T01:05:22.4268959Z +    |               --
2020-01-05T01:05:22.4269111Z 45 
2020-01-05T01:05:22.4269246Z 46 warning: where clauses are not enforced in type aliases
2020-01-05T01:05:22.4269550Z 47   --> $DIR/type-alias-bounds.rs:16:25
2020-01-05T01:05:22.4269550Z 47   --> $DIR/type-alias-bounds.rs:16:25
2020-01-05T01:05:22.4269688Z 
2020-01-05T01:05:22.4269792Z 
2020-01-05T01:05:22.4269931Z The actual stderr differed from the expected stderr.
2020-01-05T01:05:22.4270320Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/type/type-alias-bounds/type-alias-bounds.stderr
2020-01-05T01:05:22.4271202Z To update references, rerun the tests and pass the `--bless` flag
2020-01-05T01:05:22.4271574Z To only update this specific test, also pass `--test-args type/type-alias-bounds.rs`
2020-01-05T01:05:22.4271841Z error: 1 errors occurred comparing output.
2020-01-05T01:05:22.4271955Z status: exit code: 0
2020-01-05T01:05:22.4271955Z status: exit code: 0
2020-01-05T01:05:22.4272740Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/type/type-alias-bounds.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/type/type-alias-bounds" "-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/type/type-alias-bounds/auxiliary" "-A" "unused"
2020-01-05T01:05:22.4273243Z ------------------------------------------
2020-01-05T01:05:22.4273377Z 
2020-01-05T01:05:22.4273668Z ------------------------------------------
2020-01-05T01:05:22.4273831Z stderr:
2020-01-05T01:05:22.4273831Z stderr:
2020-01-05T01:05:22.4274140Z ------------------------------------------
2020-01-05T01:05:22.4274294Z warning: bounds on generic parameters are not enforced in type aliases
2020-01-05T01:05:22.4274624Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:8:14
2020-01-05T01:05:22.4274776Z    |
2020-01-05T01:05:22.4278877Z LL | type SVec<T: Send + Send> = Vec<T>;
2020-01-05T01:05:22.4280677Z    |
2020-01-05T01:05:22.4280737Z    = note: `#[warn(type_alias_bounds)]` on by default
2020-01-05T01:05:22.4280953Z help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4280988Z    |
2020-01-05T01:05:22.4280988Z    |
2020-01-05T01:05:22.4281048Z LL | type SVec<T> = Vec<T>;
2020-01-05T01:05:22.4281358Z 
2020-01-05T01:05:22.4281394Z warning: where clauses are not enforced in type aliases
2020-01-05T01:05:22.4281779Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:10:21
2020-01-05T01:05:22.4281817Z    |
2020-01-05T01:05:22.4281817Z    |
2020-01-05T01:05:22.4281851Z LL | type S2Vec<T> where T: Send = Vec<T>;
2020-01-05T01:05:22.4281979Z    |
2020-01-05T01:05:22.4282017Z help: the clause will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4282072Z    |
2020-01-05T01:05:22.4282072Z    |
2020-01-05T01:05:22.4282106Z LL | type S2Vec<T>  = Vec<T>;
2020-01-05T01:05:22.4282302Z 
2020-01-05T01:05:22.4282354Z warning: bounds on generic parameters are not enforced in type aliases
2020-01-05T01:05:22.4282775Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:12:19
2020-01-05T01:05:22.4282814Z    |
2020-01-05T01:05:22.4282814Z    |
2020-01-05T01:05:22.4283150Z LL | type VVec<'b, 'a: 'b + 'b> = (&'b u32, Vec<&'a i32>);
2020-01-05T01:05:22.4283209Z    |                   ^^   ^^
2020-01-05T01:05:22.4283281Z help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4283334Z    |
2020-01-05T01:05:22.4283334Z    |
2020-01-05T01:05:22.4283560Z LL | type VVec<'b, 'a> = (&'b u32, Vec<&'a i32>);
2020-01-05T01:05:22.4283774Z 
2020-01-05T01:05:22.4283811Z warning: bounds on generic parameters are not enforced in type aliases
2020-01-05T01:05:22.4284015Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:14:18
2020-01-05T01:05:22.4284069Z    |
2020-01-05T01:05:22.4284069Z    |
2020-01-05T01:05:22.4284259Z LL | type WVec<'b, T: 'b + 'b> = (&'b u32, Vec<T>);
2020-01-05T01:05:22.4284299Z    |                  ^^   ^^
2020-01-05T01:05:22.4284387Z help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4284431Z    |
2020-01-05T01:05:22.4284431Z    |
2020-01-05T01:05:22.4284619Z LL | type WVec<'b, T> = (&'b u32, Vec<T>);
2020-01-05T01:05:22.4284941Z 
2020-01-05T01:05:22.4284977Z warning: where clauses are not enforced in type aliases
2020-01-05T01:05:22.4285181Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:16:25
2020-01-05T01:05:22.4285236Z    |
2020-01-05T01:05:22.4285236Z    |
2020-01-05T01:05:22.4285758Z LL | type W2Vec<'b, T> where T: 'b, T: 'b = (&'b u32, Vec<T>);
2020-01-05T01:05:22.4285848Z    |
2020-01-05T01:05:22.4285887Z help: the clause will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4285923Z    |
2020-01-05T01:05:22.4285923Z    |
2020-01-05T01:05:22.4286304Z LL | type W2Vec<'b, T>  = (&'b u32, Vec<T>);
2020-01-05T01:05:22.4286666Z 
2020-01-05T01:05:22.4286703Z warning: bounds on generic parameters are not enforced in type aliases
2020-01-05T01:05:22.4286932Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:47:12
2020-01-05T01:05:22.4287146Z    |
2020-01-05T01:05:22.4287146Z    |
2020-01-05T01:05:22.4287199Z LL | type T1<U: Bound> = U::Assoc; //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4287295Z    |
2020-01-05T01:05:22.4287295Z    |
2020-01-05T01:05:22.4287335Z help: use fully disambiguated paths (i.e., `<T as Trait>::Assoc`) to refer to associated types in type aliases
2020-01-05T01:05:22.4290641Z    |
2020-01-05T01:05:22.4290641Z    |
2020-01-05T01:05:22.4290680Z LL | type T1<U: Bound> = U::Assoc; //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4290782Z help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4290820Z    |
2020-01-05T01:05:22.4290820Z    |
2020-01-05T01:05:22.4290873Z LL | type T1<U> = U::Assoc; //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4291188Z 
2020-01-05T01:05:22.4291238Z warning: where clauses are not enforced in type aliases
2020-01-05T01:05:22.4291468Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:48:18
2020-01-05T01:05:22.4291515Z    |
2020-01-05T01:05:22.4291515Z    |
2020-01-05T01:05:22.4291554Z LL | type T2<U> where U: Bound = U::Assoc;  //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4291642Z    |
2020-01-05T01:05:22.4291642Z    |
2020-01-05T01:05:22.4291682Z help: use fully disambiguated paths (i.e., `<T as Trait>::Assoc`) to refer to associated types in type aliases
2020-01-05T01:05:22.4291948Z    |
2020-01-05T01:05:22.4291948Z    |
2020-01-05T01:05:22.4291986Z LL | type T2<U> where U: Bound = U::Assoc;  //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4292085Z help: the clause will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4292122Z    |
2020-01-05T01:05:22.4292122Z    |
2020-01-05T01:05:22.4292276Z LL | type T2<U>  = U::Assoc;  //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4292541Z 
2020-01-05T01:05:22.4292579Z warning: bounds on generic parameters are not enforced in type aliases
2020-01-05T01:05:22.4292798Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:56:12
2020-01-05T01:05:22.4292836Z    |
2020-01-05T01:05:22.4292836Z    |
2020-01-05T01:05:22.4292874Z LL | type T5<U: Bound> = <U as Bound>::Assoc;  //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4293022Z    |
2020-01-05T01:05:22.4293061Z help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4293097Z    |
2020-01-05T01:05:22.4293097Z    |
2020-01-05T01:05:22.4293151Z LL | type T5<U> = <U as Bound>::Assoc;  //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4293347Z 
2020-01-05T01:05:22.4293399Z warning: bounds on generic parameters are not enforced in type aliases
2020-01-05T01:05:22.4293611Z   --> /checkout/src/test/ui/type/type-alias-bounds.rs:57:12
2020-01-05T01:05:22.4293650Z    |
2020-01-05T01:05:22.4293650Z    |
2020-01-05T01:05:22.4293767Z LL | type T6<U: Bound> = ::std::vec::Vec<U>;  //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4293853Z    |
2020-01-05T01:05:22.4293891Z help: the bound will not be checked when the type alias is used, and should be removed
2020-01-05T01:05:22.4293944Z    |
2020-01-05T01:05:22.4293944Z    |
2020-01-05T01:05:22.4293981Z LL | type T6<U> = ::std::vec::Vec<U>;  //~ WARN not enforced in type aliases
2020-01-05T01:05:22.4294201Z 
2020-01-05T01:05:22.4294237Z 
2020-01-05T01:05:22.4294984Z ------------------------------------------
2020-01-05T01:05:22.4295019Z 
---
2020-01-05T01:05:22.4295989Z thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:385:22
2020-01-05T01:05:22.4296207Z note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
2020-01-05T01:05:22.4296895Z 
2020-01-05T01:05:22.4296927Z 
2020-01-05T01:05:22.4300011Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "/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-7/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" "7.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
2020-01-05T01:05:22.4318293Z 
2020-01-05T01:05:22.4318318Z 
2020-01-05T01:05:22.4318702Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
2020-01-05T01:05:22.4318865Z Build completed unsuccessfully in 0:50:18
2020-01-05T01:05:22.4318865Z Build completed unsuccessfully in 0:50:18
2020-01-05T01:05:22.4342801Z == clock drift check ==
2020-01-05T01:05:22.4358947Z   local time: Sun Jan  5 01:05:22 UTC 2020
2020-01-05T01:05:22.9902661Z   network time: Sun, 05 Jan 2020 01:05:22 GMT
2020-01-05T01:05:22.9904483Z == end clock drift check ==
2020-01-05T01:05:24.0764220Z 
2020-01-05T01:05:24.0843381Z ##[error]Bash exited with code '1'.
2020-01-05T01:05:24.0878020Z ##[section]Starting: Checkout
2020-01-05T01:05:24.0879468Z ==============================================================================
2020-01-05T01:05:24.0879511Z Task         : Get sources
2020-01-05T01:05:24.0879546Z 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)

Centril · 2020-01-05T02:03:39Z

Could please add a regression test?

The existing code seems to assume that substitutions spans are disjoint, which is not always the case. In the example: pub trait AAAA {} pub trait B {} pub trait C {} pub type T<P: AAAA + B + C> = P; , we get three substituions starting from ':' and ending respectively at the end of each trait token. With the former offset calculation, this would cause `underline_start` to eventually become negative before being converted to `usize`... The new version may report erroneous results for non perfectly overlapping substitutions but I don't know if such examples exist. Alternatively, we could detect these cases and trim out overlapping substitutions.

lbonn · 2020-01-05T11:57:03Z

Indeed! Updated with a regression test.

petrochenkov · 2020-01-05T12:39:07Z

@bors r+

bors · 2020-01-05T12:39:09Z

📌 Commit 12545c7 has been approved by petrochenkov

Handle multiple error fix suggestions carefuly The existing code seems to assume that substitutions spans are disjoint, which is not always the case. In the example: pub trait AAAA {} pub trait B {} pub trait C {} pub type T<P: AAAA + B + C> = P; , we get three substituions starting from ':' and ending respectively at the end of each trait token. With the former offset calculation, this would cause `underline_start` to eventually become negative before being converted to `usize`... The new version may report erroneous results for non perfectly overlapping substitutions but I don't know if such examples exist. Alternatively, we could detect these cases and trim out overlapping substitutions. Fixes rust-lang#67690

@ghost

Rollup of 13 pull requests Successful merges: - #67566 (Add an unstable conversion from thread ID to u64) - #67671 (Account for `type X = impl Trait;` in lifetime suggestion) - #67727 (Stabilise vec::remove_item) - #67877 (Omit underscore constants from rustdoc) - #67880 (Handle multiple error fix suggestions carefuly) - #67898 (Improve hygiene of `newtype_index`) - #67908 (rustdoc: HTML escape const values) - #67909 (Fix ICE in const pretty printing and resolve FIXME) - #67929 (Formatting an example for method Vec.retain) - #67934 (Clean up E0178 explanation) - #67936 (fire "non_camel_case_types" for associated types) - #67943 (Missing module std in example.) - #67962 (Update books) Failed merges: r? @ghost

rust-highfive assigned petrochenkov Jan 5, 2020

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jan 5, 2020

petrochenkov 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 Jan 5, 2020

lbonn force-pushed the fix/multi-substs branch from 9666007 to 12545c7 Compare January 5, 2020 11:54

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 Jan 5, 2020

Dylan-DPC-zz mentioned this pull request Jan 6, 2020

Rollup of 5 pull requests #67931

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JohnTitor mentioned this pull request Jan 7, 2020

Rollup of 13 pull requests #67964

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bors merged commit 12545c7 into rust-lang:master Jan 7, 2020

ehuss mentioned this pull request Mar 6, 2020

Combined Lifetime Bounds Cause Compiler to Crash Unexpectedly #69783

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Handle multiple error fix suggestions carefuly #67880

Handle multiple error fix suggestions carefuly #67880

lbonn commented Jan 5, 2020

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Handle multiple error fix suggestions carefuly #67880

Handle multiple error fix suggestions carefuly #67880

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