rust/tests/ui/impl-trait/issue-35668.stderr

error[E0369]: cannot multiply `&T` by `&T`
  --> $DIR/issue-35668.rs:2:23
   |
LL |     a.iter().map(|a| a*a)
   |                      -^- &T
   |                      |
   |                      &T
   |
help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
   |
LL | fn func<'a, T>(a: &'a [T]) -> impl Iterator<Item=&'a T> where &T: Mul<&T> {
   |                                                         +++++++++++++++++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0369`.
Improve wording of "cannot multiply" type error For example, if you had this code: fn foo(x: i32, y: f32) -> f32 { x * y } You would get this error: error[E0277]: cannot multiply `f32` to `i32` --> src/lib.rs:2:7 \| 2 \| x * y \| ^ no implementation for `i32 * f32` \| = help: the trait `Mul<f32>` is not implemented for `i32` However, that's not usually how people describe multiplication. People usually describe multiplication like how the division error words it: error[E0277]: cannot divide `i32` by `f32` --> src/lib.rs:2:7 \| 2 \| x / y \| ^ no implementation for `i32 / f32` \| = help: the trait `Div<f32>` is not implemented for `i32` So that's what this change does. It changes this: error[E0277]: cannot multiply `f32` to `i32` --> src/lib.rs:2:7 \| 2 \| x * y \| ^ no implementation for `i32 * f32` \| = help: the trait `Mul<f32>` is not implemented for `i32` To this: error[E0277]: cannot multiply `i32` by `f32` --> src/lib.rs:2:7 \| 2 \| x * y \| ^ no implementation for `i32 * f32` \| = help: the trait `Mul<f32>` is not implemented for `i32` 2020-10-17 21:59:51 -05:00			error[E0369]: cannot multiply `&T` by `&T`
Better diagnostic for binary operation on BoxedValues 2019-03-27 12:13:09 -05:00			`--> $DIR/issue-35668.rs:2:23`
Move some `compile-fail` tests to `ui` 2018-07-15 16:11:54 -05:00			`\|`
			`LL \| a.iter().map(\|a\| a*a)`
Better diagnostic for binary operation on BoxedValues 2019-03-27 12:13:09 -05:00			`\| -^- &T`
			`\| \|`
			`\| &T`
Tweak binop errors * Suggest potentially missing binop trait bound (fix #73416) * Use structured suggestion for dereference in binop 2020-06-23 19:32:06 -05:00			`\|`
Handle empty where-clause better 2022-06-05 19:37:45 -05:00			help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
Tweak binop errors * Suggest potentially missing binop trait bound (fix #73416) * Use structured suggestion for dereference in binop 2020-06-23 19:32:06 -05:00			`\|`
Replace suggest_constraining_param with suggest_restricting_param_bound to fix incorrect suggestion for trait bounds involving binary operators. Fixes #93927, #92347, #93744. 2022-02-15 16:49:16 -06:00			`LL \| fn func<'a, T>(a: &'a [T]) -> impl Iterator<Item=&'a T> where &T: Mul<&T> {`
			`\| +++++++++++++++++`
Move some `compile-fail` tests to `ui` 2018-07-15 16:11:54 -05:00
			`error: aborting due to previous error`

			For more information about this error, try `rustc --explain E0369`.