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Fix unresolved type span inside async object#67392

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bors merged 2 commits intorust-lang:masterfrom
csmoe:async-typeinfo
Dec 21, 2019
Merged

Fix unresolved type span inside async object#67392
bors merged 2 commits intorust-lang:masterfrom
csmoe:async-typeinfo

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@csmoe csmoe commented Dec 18, 2019

Closes #65180
r? @estebank
It's hard to create a minimal repro for that issue, decided to give up finding mcve.
cc previous take

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 18, 2019
estebank
estebank reviewed Dec 18, 2019
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src/librustc_typeck/check/generator_interior.rs
= self.fcx.unresolved_type_vars(&ty) {
debug!("remained unresolved_type = {:?}, unresolved_type_span: {:?}",
unresolved_type, unresolved_type_span);
self.prev_unresolved_span = unresolved_type_span;
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@estebank estebank Dec 18, 2019

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What would happen in there where a chain of more than two unresolved type vars?

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estebank commented Dec 18, 2019

It looks reasonable, could you post the output from the original report?

Is it still the following?

error[E0698]: type inside `async fn` body must be known in this context
  --> src/lib.rs:15:13
   |
15 |             Ok(hyper::service::service_fn(move |req| {
   |             ^^ cannot infer type for `ME`
   |
note: the type is part of the `async fn` body because of this `await`
  --> src/lib.rs:24:5
   |
24 |     server.await
   |     ^^^^^^^^^^^^

error: aborting due to previous error

If so, we should have a follow up ticket to make the infered name being shown be the one from Ok, not from service_fn.

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csmoe commented Dec 19, 2019

It looks reasonable, could you post the output from the original report?

Is it still the following?

error[E0698]: type inside `async fn` body must be known in this context
  --> src/lib.rs:15:13
   |
15 |             Ok(hyper::service::service_fn(move |req| {
   |             ^^ cannot infer type for `ME`
   |
note: the type is part of the `async fn` body because of this `await`
  --> src/lib.rs:24:5
   |
24 |     server.await
   |     ^^^^^^^^^^^^

error: aborting due to previous error

If so, we should have a follow up ticket to make the infered name being shown be the one from Ok, not from service_fn.

yes, still holds
image

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estebank commented Dec 19, 2019

@bors r+

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bors commented Dec 19, 2019

📌 Commit ff4f6a1 has been approved by estebank

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bors commented Dec 19, 2019

🌲 The tree is currently closed for pull requests below priority 100, this pull request will be tested once the tree is reopened

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 19, 2019
Centril added a commit to Centril/rust that referenced this pull request Dec 19, 2019
@Centril
Rollup merge of rust-lang#67392 - csmoe:async-typeinfo, r=estebank
c014c45 
Fix unresolved type span inside async object

Closes rust-lang#65180
r? @estebank
It's hard to create a minimal repro for that issue, [decided](https://rust-lang.zulipchat.com/#narrow/stream/187312-wg-async-foundations/topic/meeting.202019.2E12.2E17/near/183675659) to give up finding mcve.
cc [previous take](rust-lang#65668)
@Centril Centril mentioned this pull request Dec 19, 2019
Closed
Centril added a commit to Centril/rust that referenced this pull request Dec 19, 2019
@Centril
Rollup merge of rust-lang#67426 - Centril:rollup-rswp4rf, r=Centril
fbea61a 
Rollup of 7 pull requests

Successful merges:

 - rust-lang#66670 (Normalize ident)
 - rust-lang#66755 (Remove a const-if-hack in RawVec)
 - rust-lang#67127 (Use structured suggestion for disambiguating method calls)
 - rust-lang#67281 (add string.insert benchmarks)
 - rust-lang#67328 (Remove now-redundant range check on u128 -> f32 casts)
 - rust-lang#67392 (Fix unresolved type span inside async object)
 - rust-lang#67421 (Fix internal documentation typo)

Failed merges:

r? @ghost
Centril added a commit to Centril/rust that referenced this pull request Dec 19, 2019
@Centril
Rollup merge of rust-lang#67426 - Centril:rollup-rswp4rf, r=Centril
edeabe6 
Rollup of 7 pull requests

Successful merges:

 - rust-lang#66670 (Normalize ident)
 - rust-lang#66755 (Remove a const-if-hack in RawVec)
 - rust-lang#67127 (Use structured suggestion for disambiguating method calls)
 - rust-lang#67281 (add string.insert benchmarks)
 - rust-lang#67328 (Remove now-redundant range check on u128 -> f32 casts)
 - rust-lang#67392 (Fix unresolved type span inside async object)
 - rust-lang#67421 (Fix internal documentation typo)

Failed merges:

r? @ghost
Mark-Simulacrum added a commit to Mark-Simulacrum/rust that referenced this pull request Dec 19, 2019
@Mark-Simulacrum
Rollup merge of rust-lang#67426 - Centril:rollup-rswp4rf, r=Centril
e2c608b 
Rollup of 7 pull requests

Successful merges:

 - rust-lang#66670 (Normalize ident)
 - rust-lang#66755 (Remove a const-if-hack in RawVec)
 - rust-lang#67127 (Use structured suggestion for disambiguating method calls)
 - rust-lang#67281 (add string.insert benchmarks)
 - rust-lang#67328 (Remove now-redundant range check on u128 -> f32 casts)
 - rust-lang#67392 (Fix unresolved type span inside async object)
 - rust-lang#67421 (Fix internal documentation typo)

Failed merges:

r? @ghost
Centril added a commit to Centril/rust that referenced this pull request Dec 20, 2019
@Centril
Rollup merge of rust-lang#67392 - csmoe:async-typeinfo, r=estebank
27e39b1 
Fix unresolved type span inside async object

Closes rust-lang#65180
r? @estebank
It's hard to create a minimal repro for that issue, [decided](https://rust-lang.zulipchat.com/#narrow/stream/187312-wg-async-foundations/topic/meeting.202019.2E12.2E17/near/183675659) to give up finding mcve.
cc [previous take](rust-lang#65668)
@Centril Centril mentioned this pull request Dec 20, 2019
Closed
Centril added a commit to Centril/rust that referenced this pull request Dec 20, 2019
@Centril
Rollup merge of rust-lang#67392 - csmoe:async-typeinfo, r=estebank
d7dc350 
Fix unresolved type span inside async object

Closes rust-lang#65180
r? @estebank
It's hard to create a minimal repro for that issue, [decided](https://rust-lang.zulipchat.com/#narrow/stream/187312-wg-async-foundations/topic/meeting.202019.2E12.2E17/near/183675659) to give up finding mcve.
cc [previous take](rust-lang#65668)
@Centril Centril mentioned this pull request Dec 20, 2019
Merged
bors added a commit that referenced this pull request Dec 21, 2019
@bors
Auto merge of #67464 - Centril:rollup-j3mkl1m, r=Centril
9ff30a7 
Rollup of 6 pull requests

Successful merges:

 - #67130 (Const prop should finish propagation into user defined variables)
 - #67163 (Split up ptr/mod.rs in libcore...)
 - #67314 (Don't suppress move errors for union fields)
 - #67392 (Fix unresolved type span inside async object)
 - #67404 (Separate region inference logic from error handling better)
 - #67428 (`is_binding_pat`: use explicit match & include or-pats in grammar)

Failed merges:

r? @ghost
@bors bors merged commit ff4f6a1 into rust-lang:master Dec 21, 2019
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Async-related type error messages defy expectations (in span location)

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