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Use PredicateObligations instead of Predicates

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Keep more information about trait binding failures.
This commit is contained in:
Esteban Küber 2020-03-03 15:07:04 -08:00
parent 485c5fb6e1
commit bd7ea5441e
90 changed files with 280 additions and 141 deletions
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10
src/test/ui/suggestions/missing-assoc-type-bound-restriction.stderr
View file

@ -2,7 +2,10 @@ error[E0277]: the trait bound `<T as Parent>::Assoc: Child<A>` is not satisfied
--> $DIR/missing-assoc-type-bound-restriction.rs:17:19
|
LL | trait Parent {
| ------------ required by `Parent`
| ------
LL | type Ty;
LL | type Assoc: Child<Self::Ty>;
| --------------- required by this bound in `Parent`
...
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> {
| ^^^^^^ - help: consider further restricting the associated type: `where <T as Parent>::Assoc: Child<A>`
@ -29,7 +32,10 @@ error[E0277]: the trait bound `<T as Parent>::Assoc: Child<A>` is not satisfied
--> $DIR/missing-assoc-type-bound-restriction.rs:20:5
|
LL | trait Parent {
| ------------ required by `Parent`
| ------
LL | type Ty;
LL | type Assoc: Child<Self::Ty>;
| --------------- required by this bound in `Parent`
...
LL | impl<A, T: Parent<Ty = A>> Parent for ParentWrapper<T> {
| - help: consider further restricting the associated type: `where <T as Parent>::Assoc: Child<A>`

12
src/test/ui/suggestions/mut-borrow-needed-by-trait.stderr
View file

@ -12,18 +12,26 @@ error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satis
|
LL | let fp = BufWriter::new(fp);
| ^^^^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
|
::: $SRC_DIR/libstd/io/buffered.rs:LL:COL
|
LL | pub struct BufWriter<W: Write> {
| ----- required by this bound in `std::io::BufWriter`
|
= note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
= note: required by `std::io::BufWriter`
error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
--> $DIR/mut-borrow-needed-by-trait.rs:17:14
|
LL | let fp = BufWriter::new(fp);
| ^^^^^^^^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
|
::: $SRC_DIR/libstd/io/buffered.rs:LL:COL
|
LL | pub struct BufWriter<W: Write> {
| ----- required by this bound in `std::io::BufWriter`
|
= note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
= note: required by `std::io::BufWriter`
error[E0599]: no method named `write_fmt` found for struct `std::io::BufWriter<&dyn std::io::Write>` in the current scope
--> $DIR/mut-borrow-needed-by-trait.rs:22:5