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improve const infer error #76699

Merged
merged 2 commits into from Sep 16, 2020
Merged

improve const infer error #76699

merged 2 commits into from Sep 16, 2020

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lcnr
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@lcnr lcnr commented Sep 14, 2020

cc #72328

reduces it from

error[E0282]: type annotations needed
  --> src/main.rs:17:5
   |
17 |     Foo.bar().bar().bar().bar().baz();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: unable to infer the value of a const parameter

to

error[E0282]: type annotations needed
  --> $DIR/method-chain.rs:21:33
   |
LL |     Foo.bar().bar().bar().bar().baz();
   |                                 ^^^
   |
   = note: cannot infer the value of the const parameter `N`

r? @varkor

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 14, 2020
@lcnr lcnr changed the title shrink const infer error span improve const infer error Sep 14, 2020
@varkor varkor added the F-const_generics `#![feature(const_generics)]` label Sep 14, 2020
@varkor
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varkor commented Sep 14, 2020

Thanks, this is a significant improvement already.
@bors r+ rollup

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bors commented Sep 14, 2020

📌 Commit 035f879 has been approved by varkor

@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 Sep 14, 2020
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Sep 16, 2020
improve const infer error

cc rust-lang#72328

reduces it from
```
error[E0282]: type annotations needed
  --> src/main.rs:17:5
   |
17 |     Foo.bar().bar().bar().bar().baz();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: unable to infer the value of a const parameter
```
to
```
error[E0282]: type annotations needed
  --> $DIR/method-chain.rs:21:33
   |
LL |     Foo.bar().bar().bar().bar().baz();
   |                                 ^^^
   |
   = note: cannot infer the value of the const parameter `N`
```

r? @varkor
bors added a commit to rust-lang-ci/rust that referenced this pull request Sep 16, 2020
Rollup of 10 pull requests

Successful merges:

 - rust-lang#76669 (Prefer asm! over llvm_asm! in core)
 - rust-lang#76675 (Small improvements to asm documentation)
 - rust-lang#76681 (remove orphaned files)
 - rust-lang#76694 (Introduce a PartitioningCx struct)
 - rust-lang#76695 (fix syntax error in suggesting generic constraint in trait parameter)
 - rust-lang#76699 (improve const infer error)
 - rust-lang#76707 (Simplify iter flatten struct doc)
 - rust-lang#76710 (:arrow_up: rust-analyzer)
 - rust-lang#76714 (Small docs improvements)
 - rust-lang#76717 (Fix generating rustc docs with non-default lib directory.)

Failed merges:

r? `@ghost`
@bors bors merged commit 3f9e7fc into rust-lang:master Sep 16, 2020
@rustbot rustbot added this to the 1.48.0 milestone Sep 16, 2020
@lcnr lcnr deleted the const-infer-err branch September 16, 2020 18:12
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5 participants