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Suggest _ in turbofish if param will be inferred from fn argument

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This commit is contained in:
Esteban Kuber 2021-09-21 13:18:26 +00:00
parent 15d9ba0133
commit affea730e9
4 changed files with 57 additions and 1 deletions
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8
src/test/ui/suggestions/missing-type-param-used-in-param.fixed Normal file
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@ -0,0 +1,8 @@
// run-rustfix
fn two_type_params<A, B>(_: B) {}
fn main() {
two_type_params::<String, _>(100); //~ ERROR this function takes 2 generic arguments
two_type_params::<String, _>(100);
}

8
src/test/ui/suggestions/missing-type-param-used-in-param.rs Normal file
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@ -0,0 +1,8 @@
// run-rustfix
fn two_type_params<A, B>(_: B) {}
fn main() {
two_type_params::<String>(100); //~ ERROR this function takes 2 generic arguments
two_type_params::<String, _>(100);
}

21
src/test/ui/suggestions/missing-type-param-used-in-param.stderr Normal file
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error[E0107]: this function takes 2 generic arguments but 1 generic argument was supplied
--> $DIR/missing-type-param-used-in-param.rs:6:5
|
LL | two_type_params::<String>(100);
| ^^^^^^^^^^^^^^^ ------ supplied 1 generic argument
| |
| expected 2 generic arguments
|
note: function defined here, with 2 generic parameters: `A`, `B`
--> $DIR/missing-type-param-used-in-param.rs:3:4
|
LL | fn two_type_params<A, B>(_: B) {}
| ^^^^^^^^^^^^^^^ - -
help: add missing generic argument
|
LL | two_type_params::<String, _>(100);
| +++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0107`.