Rename _ to {integer} and {float} for unknown numeric types #35080
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r? @eddyb (rust_highfive has picked a reviewer for you, use r? to override) |
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Keep in mind that integer and floating-point inference variables are different and sometimes it's helpful to tell them apart. |
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@eddyb - agreed. I can change this to make that more explicit. Since being more explicit can also make types more cumbersome, I wanted to start simple. |
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We could use {float} and {integer}... |
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+1, this is a great change. I like having |
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@nrc Small problem is with generics, e.g. |
sophiajt
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r=me on the patch, do we want to solicit any more feedback? Or just run with it? (I'm happy either way) |
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Should update the PR title and description to use |
sophiajt
changed the title
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@eddyb - done |
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This is awesome, such a small fix and such a fundamental improvement. Why haven't this been done years ago? |
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@bors r+ |
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📌 Commit ea77049 has been approved by |
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@bors: rollup assuming this isn't very platform-specific and green travis means it's good to go whenever |
…d_found, r=nikomatsakis
Rename _ to {integer} and {float} for unknown numeric types
This PR renames _ to {integer} or {float} for unknown numeric types, to help people parse error messages that have numeric types that haven't been nailed down.
Example:
```rust
fn main() {
let x: String = 4;
}
```
Before:
```
error[E0308]: mismatched types
--> quicktest.rs:2:21
|
2 | let x: String = 4;
| ^ expected struct `std::string::String`, found integral variable
|
= note: expected type `std::string::String`
= note: found type `_`
error: aborting due to previous error
```
after:
```
error[E0308]: mismatched types
--> quicktest.rs:2:21
|
2 | let x: String = 4;
| ^ expected struct `std::string::String`, found integral variable
|
= note: expected type `std::string::String`
= note: found type `{integer}`
error: aborting due to previous error
```
```
…d_found, r=nikomatsakis
Rename _ to {integer} and {float} for unknown numeric types
This PR renames _ to {integer} or {float} for unknown numeric types, to help people parse error messages that have numeric types that haven't been nailed down.
Example:
```rust
fn main() {
let x: String = 4;
}
```
Before:
```
error[E0308]: mismatched types
--> quicktest.rs:2:21
|
2 | let x: String = 4;
| ^ expected struct `std::string::String`, found integral variable
|
= note: expected type `std::string::String`
= note: found type `_`
error: aborting due to previous error
```
after:
```
error[E0308]: mismatched types
--> quicktest.rs:2:21
|
2 | let x: String = 4;
| ^ expected struct `std::string::String`, found integral variable
|
= note: expected type `std::string::String`
= note: found type `{integer}`
error: aborting due to previous error
```
```
This PR renames _ to {integer} or {float} for unknown numeric types, to help people parse error messages that have numeric types that haven't been nailed down.
Example:
Before:
after: