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typeck: limit number of candidates shown for a single error #33338

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merged 1 commit into from
May 12, 2016
Merged

typeck: limit number of candidates shown for a single error #33338

merged 1 commit into from
May 12, 2016

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birkenfeld
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No idea if 10/11 is a good limit. Are there any other such limits in rustc currently?

Fixes: #25356

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r? @Aatch

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Manishearth
Manishearth reviewed May 2, 2016
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src/librustc_typeck/check/method/suggest.rs
@@ -236,8 +236,10 @@ pub fn report_error<'a, 'tcx>(fcx: &FnCtxt<'a, 'tcx>,
mut sources: Vec<CandidateSource>) {
sources.sort();
sources.dedup();
// Dynamic limit to avoid hiding just one candidate, which is silly.
let limit = if sources.len() == 11 { 11 } else { 10 };
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good idea

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good idea

@Manishearth
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LGTM. I'd like someone else (@jonathandturner?) to rubber-stamp the number 10 as well, though 😄

@sophiajt
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sophiajt commented May 2, 2016

How difficult would it be to show an elision?

Something like:

src\main.rs:206:9: 206:35 error: multiple applicable methods in scope [E0034]
src\main.rs:206     0.0.max(normal.dot(light_dir)) * res
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~
src\main.rs:206:9: 206:35 note: candidate #1 is defined in an impl of the trait `core::iter::Iterator` for the type `std::ascii::EscapeDefault`
src\main.rs:206     0.0.max(normal.dot(light_dir)) * res
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~
src\main.rs:206:9: 206:35 note: candidate #2 is defined in an impl of the trait `core::iter::Iterator` for the type `std::collections::hash::table::RawBuckets<'_, _, _>`
src\main.rs:206     0.0.max(normal.dot(light_dir)) * res
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~
src\main.rs:206:9: 206:35 note: additional candidates elided.

FWIW, I'm fine stopping at 10, but I think it'd be good to let the user know there were others, they just aren't shown.

@birkenfeld
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@jonathandturner it should already say "N more candidates not shown" at the end.

I just found another example in

rust/src/librustc/traits/error_reporting.rs

Line 209 in 90318b8

fn report_similar_impl_candidates(span: Span,
- it stops at 4 and says "and N others" at the end. I could adapt to this.

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sophiajt commented May 2, 2016

Great, I missed that. If it has the message, I'm fine stopping even sooner than 10. 4 sounds good.

@Manishearth
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sgtm either way. I'd like to switch to "and N others" though, let's keep things uniform.

@bors delegate+

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bors commented May 2, 2016

✌️ @birkenfeld can now approve this pull request

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@bors r=Manishearth

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bors commented May 3, 2016

📌 Commit 9508180 has been approved by Manishearth

@Manishearth Manishearth mentioned this pull request May 3, 2016
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bors commented May 3, 2016

⌛ Testing commit 9508180 with merge db2531f...

@Manishearth Manishearth closed this May 3, 2016
@Manishearth Manishearth reopened this May 3, 2016
@Manishearth Manishearth closed this May 3, 2016
@Manishearth Manishearth reopened this May 3, 2016
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@bors clean force

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@bors r- clean force

(something's wrong with the queue)

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@bors r+ clean

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bors commented May 3, 2016

📌 Commit 9508180 has been approved by Manishearth

@Manishearth Manishearth closed this May 3, 2016
@Manishearth Manishearth reopened this May 3, 2016
@Manishearth Manishearth closed this May 3, 2016
@Manishearth Manishearth reopened this May 3, 2016
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@bors: retry force clean

bors added a commit that referenced this pull request May 3, 2016
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Auto merge of #33376 - Manishearth:rollup, r=Manishearth
1fb4b5b 
Rollup of 14 pull requests

- Successful merges: #33277, #33294, #33314, #33322, #33333, #33338, #33339, #33340, #33343, #33357, #33363, #33365, #33371, #33372
- Failed merges:
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Is the travis failure here legitimate?

@birkenfeld
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Yes; the diagnostics API changed on master. I'll fix it soon.

bors added a commit that referenced this pull request May 3, 2016
@bors
Auto merge of #33376 - Manishearth:rollup, r=Manishearth
f7125fc 
Rollup of 14 pull requests

- Successful merges: #33277, #33294, #33314, #33322, #33333, #33338, #33339, #33340, #33343, #33357, #33363, #33365, #33371, #33372
- Failed merges:
bors added a commit that referenced this pull request May 4, 2016
@bors
Auto merge of #33376 - Manishearth:rollup, r=Manishearth
1895d08 
Rollup of 14 pull requests

- Successful merges: #33277, #33294, #33314, #33322, #33333, #33338, #33339, #33340, #33343, #33357, #33363, #33365, #33371, #33372
- Failed merges:
bors added a commit that referenced this pull request May 4, 2016
@bors
Auto merge of #33376 - Manishearth:rollup, r=Manishearth
7a0ccc4 
Rollup of 14 pull requests

- Successful merges: #33277, #33294, #33314, #33322, #33333, #33338, #33339, #33340, #33343, #33357, #33363, #33365, #33371, #33372
- Failed merges:
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bors commented May 11, 2016

☔ The latest upstream changes (presumably #33425) made this pull request unmergeable. Please resolve the merge conflicts.

@birkenfeld
typeck: limit number of candidates shown for a single error
6ab93d7 
Limit of 4 taken consistent with limit for "similar impl candidates"
in rustc::traits::error_reporting.

Fixes: rust-lang#25356
@birkenfeld
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Rebased.

@jseyfried
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@bors r+

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bors commented May 12, 2016

📌 Commit 6ab93d7 has been approved by jseyfried

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bors commented May 12, 2016

⌛ Testing commit 6ab93d7 with merge e88defe...

bors added a commit that referenced this pull request May 12, 2016
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Auto merge of #33338 - birkenfeld:issue-25356, r=jseyfried
e88defe 
typeck: limit number of candidates shown for a single error

No idea if 10/11 is a good limit. Are there any other such limits in rustc currently?

Fixes: #25356
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bors commented May 12, 2016

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-32cross-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild

@bors bors merged commit 6ab93d7 into rust-lang:master May 12, 2016
@birkenfeld birkenfeld deleted the issue-25356 branch May 12, 2016 17:36
@bluss bluss added the relnotes Marks issues that should be documented in the release notes of the next release. label May 13, 2016
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@birkenfeld @rust-highfive @Manishearth @sophiajt @bors @alexcrichton @steveklabnik @jseyfried @Aatch @bluss