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Don't typecheck recovered method call from suggestion #112100

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merged 1 commit into from
May 30, 2023

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jieyouxu
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Only make the use-dot-operator-to-call-method suggestion, but do not double down and use the recovered type to perform method call typechecking as it will produce confusing diagnostics relevant for the fixed code.

Code Sample

struct Client;

impl Client {
    fn post<T: std::ops::Add>(&self, _: T, _: T) {}
}

fn f() {
    let c = Client;
    post(c, ());
}

Before This PR

error[[E0277]](https://doc.rust-lang.org/stable/error_codes/E0277.html): cannot add `()` to `()`
 --> src/lib.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^^^^^^^^ no implementation for `() + ()`
  |
  = help: the trait `Add` is not implemented for `()`
note: required by a bound in `Client::post`
 --> src/lib.rs:4:16
  |
4 |     fn post<T: std::ops::Add>(&self, _: T, _: T) {}
  |                ^^^^^^^^^^^^^ required by this bound in `Client::post`

error[[E0061]](https://doc.rust-lang.org/stable/error_codes/E0061.html): this function takes 2 arguments but 1 argument was supplied
 --> src/lib.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^ an argument of type `()` is missing
  |
note: method defined here
 --> src/lib.rs:4:8
  |
4 |     fn post<T: std::ops::Add>(&self, _: T, _: T) {}
  |        ^^^^                   -----  ----  ----
help: provide the argument
  |
9 |     post((), ())(c, ());
  |         ++++++++

error[[E0425]](https://doc.rust-lang.org/stable/error_codes/E0425.html): cannot find function `post` in this scope
 --> src/lib.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^ not found in this scope
  |
help: use the `.` operator to call the method `post` on `&Client`
  |
9 -     post(c, ());
9 +     c.post(());
  |

Some errors have detailed explanations: E0061, E0277, E0425.
For more information about an error, try `rustc --explain E0061`.

After This PR

error[E0425]: cannot find function `post` in this scope
 --> tests/ui/typeck/issue-106929.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^ not found in this scope
  |
help: use the `.` operator to call the method `post` on `&Client`
  |
9 -     post(c, ());
9 +     c.post(());
  |

error: aborting due to previous error

For more information about this error, try `rustc --explain E0425`.

Fixes #106929.

Only make the use-dot-operator-to-call-method suggestion, but do not
double down and use the recovered type to perform method call
typechecking as it will produce confusing diagnostics on the "fixed"
code.
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rustbot commented May 30, 2023

r? @oli-obk

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

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 30, 2023
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oli-obk commented May 30, 2023

oof yea, that makes sense!

@bors r+ rollup

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bors commented May 30, 2023

📌 Commit e11ffb6 has been approved by oli-obk

It is now in the queue for this repository.

@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 May 30, 2023
Noratrieb added a commit to Noratrieb/rust that referenced this pull request May 30, 2023
Don't typecheck recovered method call from suggestion

Only make the use-dot-operator-to-call-method suggestion, but do not double down and use the recovered type to perform method call typechecking as it will produce confusing diagnostics relevant for the *fixed* code.

### Code Sample

```rust
struct Client;

impl Client {
    fn post<T: std::ops::Add>(&self, _: T, _: T) {}
}

fn f() {
    let c = Client;
    post(c, ());
}
```

### Before This PR

```
error[[E0277]](https://doc.rust-lang.org/stable/error_codes/E0277.html): cannot add `()` to `()`
 --> src/lib.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^^^^^^^^ no implementation for `() + ()`
  |
  = help: the trait `Add` is not implemented for `()`
note: required by a bound in `Client::post`
 --> src/lib.rs:4:16
  |
4 |     fn post<T: std::ops::Add>(&self, _: T, _: T) {}
  |                ^^^^^^^^^^^^^ required by this bound in `Client::post`

error[[E0061]](https://doc.rust-lang.org/stable/error_codes/E0061.html): this function takes 2 arguments but 1 argument was supplied
 --> src/lib.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^ an argument of type `()` is missing
  |
note: method defined here
 --> src/lib.rs:4:8
  |
4 |     fn post<T: std::ops::Add>(&self, _: T, _: T) {}
  |        ^^^^                   -----  ----  ----
help: provide the argument
  |
9 |     post((), ())(c, ());
  |         ++++++++

error[[E0425]](https://doc.rust-lang.org/stable/error_codes/E0425.html): cannot find function `post` in this scope
 --> src/lib.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^ not found in this scope
  |
help: use the `.` operator to call the method `post` on `&Client`
  |
9 -     post(c, ());
9 +     c.post(());
  |

Some errors have detailed explanations: E0061, E0277, E0425.
For more information about an error, try `rustc --explain E0061`.
```

### After This PR

```
error[E0425]: cannot find function `post` in this scope
 --> tests/ui/typeck/issue-106929.rs:9:5
  |
9 |     post(c, ());
  |     ^^^^ not found in this scope
  |
help: use the `.` operator to call the method `post` on `&Client`
  |
9 -     post(c, ());
9 +     c.post(());
  |

error: aborting due to previous error

For more information about this error, try `rustc --explain E0425`.
```

Fixes rust-lang#106929.
bors added a commit to rust-lang-ci/rust that referenced this pull request May 30, 2023
Rollup of 7 pull requests

Successful merges:

 - rust-lang#107916 (fix comment on Allocator trait)
 - rust-lang#111543 (Uplift `clippy::invalid_utf8_in_unchecked` lint)
 - rust-lang#111872 (fix: dedup `static_candidates` before report)
 - rust-lang#111955 (bootstrap: Various Step refactors)
 - rust-lang#112060 (`EarlyBinder::new` -> `EarlyBinder::bind`)
 - rust-lang#112064 (Migrate GUI colors test to original CSS color format)
 - rust-lang#112100 (Don't typecheck recovered method call from suggestion)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit cc12182 into rust-lang:master May 30, 2023
@rustbot rustbot added this to the 1.72.0 milestone May 30, 2023
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First complains on wrong types and wrong arguments count and then complains that the function doesn't exist
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