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-rw-r--r--tests/ui/errors/traits/blame-trait-error-spans-on-exprs.rs137
-rw-r--r--tests/ui/errors/traits/blame-trait-error-spans-on-exprs.stderr412
2 files changed, 549 insertions, 0 deletions
diff --git a/tests/ui/errors/traits/blame-trait-error-spans-on-exprs.rs b/tests/ui/errors/traits/blame-trait-error-spans-on-exprs.rs
new file mode 100644
index 000000000..6fea409ed
--- /dev/null
+++ b/tests/ui/errors/traits/blame-trait-error-spans-on-exprs.rs
@@ -0,0 +1,137 @@
+// This test examines the error spans reported when a generic `impl` fails.
+// For example, if a function wants an `Option<T>` where `T: Copy` but you pass `Some(vec![1, 2])`,
+// then we want to point at the `vec![1, 2]` and not the `Some( ... )` expression.
+
+trait T1 {}
+trait T2 {}
+trait T3 {}
+trait T4 {}
+
+impl T2 for i32 {}
+impl T3 for i32 {}
+
+struct Wrapper<W> {
+ value: W,
+}
+impl<B: T2> T1 for Wrapper<B> {}
+
+struct Burrito<F> {
+ spicy: bool,
+ filling: F,
+}
+impl<A: T3> T2 for Burrito<A> {}
+
+struct BurritoTuple<F>(F);
+impl<C: T3> T2 for BurritoTuple<C> {}
+
+enum BurritoKinds<G> {
+ SmallBurrito { spicy: bool, small_filling: G },
+ LargeBurrito { spicy: bool, large_filling: G },
+ MultiBurrito { first_filling: G, second_filling: G },
+}
+impl<D: T3> T2 for BurritoKinds<D> {}
+
+struct Taco<H>(bool, H);
+impl<E: T3> T2 for Taco<E> {}
+
+enum TacoKinds<H> {
+ OneTaco(bool, H),
+ TwoTacos(bool, H, H),
+}
+impl<F: T3> T2 for TacoKinds<F> {}
+
+struct GenericBurrito<Spiciness, Filling> {
+ spiciness: Spiciness,
+ filling: Filling,
+}
+impl<X, Y: T3> T2 for GenericBurrito<X, Y> {}
+struct NotSpicy;
+
+impl<A: T3, B: T3> T2 for (A, B) {}
+impl<A: T2, B: T2> T1 for (A, B) {}
+
+fn want<V: T1>(_x: V) {}
+
+// Some more-complex examples:
+type AliasBurrito<T> = GenericBurrito<T, T>;
+
+// The following example is fairly confusing. The idea is that we want to "misdirect" the location
+// of the error.
+
+struct Two<A, B> {
+ a: A,
+ b: B,
+}
+
+impl<X, Y: T1, Z> T1 for Two<Two<X, Y>, Z> {}
+
+struct DoubleWrapper<T> {
+ item: Wrapper<T>,
+}
+
+impl<T: T1> T1 for DoubleWrapper<T> {}
+
+impl<'a, T: T2> T1 for &'a T {}
+
+fn example<Q>(q: Q) {
+ // In each of the following examples, we expect the error span to point at the 'q' variable,
+ // since the missing constraint is `Q: T3`.
+
+ // Verifies for struct:
+ want(Wrapper { value: Burrito { spicy: false, filling: q } });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ // Verifies for enum with named fields in variant:
+ want(Wrapper { value: BurritoKinds::SmallBurrito { spicy: true, small_filling: q } });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ // Verifies for tuple struct:
+ want(Wrapper { value: Taco(false, q) });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ // Verifies for tuple enum variant:
+ want(Wrapper { value: TacoKinds::OneTaco(false, q) });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ // Verifies for generic type with multiple parameters:
+ want(Wrapper { value: GenericBurrito { spiciness: NotSpicy, filling: q } });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ // Verifies for tuple:
+ want((3, q));
+ //~^ ERROR the trait bound `Q: T2` is not satisfied [E0277]
+
+ // Verifies for nested tuple:
+ want(Wrapper { value: (3, q) });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ // Verifies for nested tuple:
+ want(((3, q), 5));
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ want(DoubleWrapper { item: Wrapper { value: q } });
+ //~^ ERROR the trait bound `Q: T1` is not satisfied [E0277]
+
+ want(DoubleWrapper { item: Wrapper { value: DoubleWrapper { item: Wrapper { value: q } } } });
+ //~^ ERROR the trait bound `Q: T1` is not satisfied [E0277]
+
+ // Verifies for type alias to struct:
+ want(Wrapper { value: AliasBurrito { spiciness: q, filling: q } });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+
+ want(Two { a: Two { a: (), b: q }, b: () });
+ //~^ ERROR the trait bound `Q: T1` is not satisfied [E0277]
+
+ // We *should* blame the 'q'.
+ // FIXME: Right now, the wrong field is blamed.
+ want(
+ Two { a: Two { a: (), b: Two { a: Two { a: (), b: q }, b: () } }, b: () },
+ //~^ ERROR the trait bound `Q: T1` is not satisfied [E0277]
+ );
+
+ // Verifies for reference:
+ want(&Burrito { spicy: false, filling: q });
+ //~^ ERROR the trait bound `Q: T3` is not satisfied [E0277]
+}
+
+fn main() {}
diff --git a/tests/ui/errors/traits/blame-trait-error-spans-on-exprs.stderr b/tests/ui/errors/traits/blame-trait-error-spans-on-exprs.stderr
new file mode 100644
index 000000000..b6a24e12b
--- /dev/null
+++ b/tests/ui/errors/traits/blame-trait-error-spans-on-exprs.stderr
@@ -0,0 +1,412 @@
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:81:60
+ |
+LL | want(Wrapper { value: Burrito { spicy: false, filling: q } });
+ | ---- required by a bound introduced by this call ^ the trait `T3` is not implemented for `Q`
+ |
+note: required for `Burrito<Q>` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:22:13
+ |
+LL | impl<A: T3> T2 for Burrito<A> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `Wrapper<Burrito<Q>>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:16:13
+ |
+LL | impl<B: T2> T1 for Wrapper<B> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:85:84
+ |
+LL | want(Wrapper { value: BurritoKinds::SmallBurrito { spicy: true, small_filling: q } });
+ | ---- required by a bound introduced by this call ^ the trait `T3` is not implemented for `Q`
+ |
+note: required for `BurritoKinds<Q>` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:32:13
+ |
+LL | impl<D: T3> T2 for BurritoKinds<D> {}
+ | -- ^^ ^^^^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `Wrapper<BurritoKinds<Q>>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:16:13
+ |
+LL | impl<B: T2> T1 for Wrapper<B> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:89:39
+ |
+LL | want(Wrapper { value: Taco(false, q) });
+ | ---- ^ the trait `T3` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `Taco<Q>` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:35:13
+ |
+LL | impl<E: T3> T2 for Taco<E> {}
+ | -- ^^ ^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `Wrapper<Taco<Q>>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:16:13
+ |
+LL | impl<B: T2> T1 for Wrapper<B> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:93:53
+ |
+LL | want(Wrapper { value: TacoKinds::OneTaco(false, q) });
+ | ---- ^ the trait `T3` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `TacoKinds<Q>` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:41:13
+ |
+LL | impl<F: T3> T2 for TacoKinds<F> {}
+ | -- ^^ ^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `Wrapper<TacoKinds<Q>>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:16:13
+ |
+LL | impl<B: T2> T1 for Wrapper<B> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:97:74
+ |
+LL | want(Wrapper { value: GenericBurrito { spiciness: NotSpicy, filling: q } });
+ | ---- required by a bound introduced by this call ^ the trait `T3` is not implemented for `Q`
+ |
+note: required for `GenericBurrito<NotSpicy, Q>` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:47:16
+ |
+LL | impl<X, Y: T3> T2 for GenericBurrito<X, Y> {}
+ | -- ^^ ^^^^^^^^^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `Wrapper<GenericBurrito<NotSpicy, Q>>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:16:13
+ |
+LL | impl<B: T2> T1 for Wrapper<B> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T2` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:101:14
+ |
+LL | want((3, q));
+ | ---- ^ the trait `T2` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `(i32, Q)` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:51:20
+ |
+LL | impl<A: T2, B: T2> T1 for (A, B) {}
+ | -- ^^ ^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T2>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:105:31
+ |
+LL | want(Wrapper { value: (3, q) });
+ | ---- ^ the trait `T3` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `(i32, Q)` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:50:20
+ |
+LL | impl<A: T3, B: T3> T2 for (A, B) {}
+ | -- ^^ ^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `Wrapper<(i32, Q)>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:16:13
+ |
+LL | impl<B: T2> T1 for Wrapper<B> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:109:15
+ |
+LL | want(((3, q), 5));
+ | ---- ^ the trait `T3` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `(i32, Q)` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:50:20
+ |
+LL | impl<A: T3, B: T3> T2 for (A, B) {}
+ | -- ^^ ^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `((i32, Q), i32)` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:51:20
+ |
+LL | impl<A: T2, B: T2> T1 for (A, B) {}
+ | -- ^^ ^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T1` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:112:49
+ |
+LL | want(DoubleWrapper { item: Wrapper { value: q } });
+ | ---- ^ the trait `T1` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `DoubleWrapper<Q>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:72:13
+ |
+LL | impl<T: T1> T1 for DoubleWrapper<T> {}
+ | -- ^^ ^^^^^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T1>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T1` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:115:88
+ |
+LL | want(DoubleWrapper { item: Wrapper { value: DoubleWrapper { item: Wrapper { value: q } } } });
+ | ---- required by a bound introduced by this call ^ the trait `T1` is not implemented for `Q`
+ |
+note: required for `DoubleWrapper<Q>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:72:13
+ |
+LL | impl<T: T1> T1 for DoubleWrapper<T> {}
+ | -- ^^ ^^^^^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+ = note: 1 redundant requirement hidden
+ = note: required for `DoubleWrapper<DoubleWrapper<Q>>` to implement `T1`
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T1>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:119:27
+ |
+LL | want(Wrapper { value: AliasBurrito { spiciness: q, filling: q } });
+ | ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `T3` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `GenericBurrito<Q, Q>` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:47:16
+ |
+LL | impl<X, Y: T3> T2 for GenericBurrito<X, Y> {}
+ | -- ^^ ^^^^^^^^^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `Wrapper<GenericBurrito<Q, Q>>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:16:13
+ |
+LL | impl<B: T2> T1 for Wrapper<B> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T1` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:122:35
+ |
+LL | want(Two { a: Two { a: (), b: q }, b: () });
+ | ---- ^ the trait `T1` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `Two<Two<(), Q>, ()>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:66:19
+ |
+LL | impl<X, Y: T1, Z> T1 for Two<Two<X, Y>, Z> {}
+ | -- ^^ ^^^^^^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T1>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T1` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:128:59
+ |
+LL | want(
+ | ---- required by a bound introduced by this call
+LL | Two { a: Two { a: (), b: Two { a: Two { a: (), b: q }, b: () } }, b: () },
+ | ^ the trait `T1` is not implemented for `Q`
+ |
+note: required for `Two<Two<(), Q>, ()>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:66:19
+ |
+LL | impl<X, Y: T1, Z> T1 for Two<Two<X, Y>, Z> {}
+ | -- ^^ ^^^^^^^^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+ = note: 1 redundant requirement hidden
+ = note: required for `Two<Two<(), Two<Two<(), Q>, ()>>, ()>` to implement `T1`
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T1>(q: Q) {
+ | ++++
+
+error[E0277]: the trait bound `Q: T3` is not satisfied
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:133:44
+ |
+LL | want(&Burrito { spicy: false, filling: q });
+ | ---- ^ the trait `T3` is not implemented for `Q`
+ | |
+ | required by a bound introduced by this call
+ |
+note: required for `Burrito<Q>` to implement `T2`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:22:13
+ |
+LL | impl<A: T3> T2 for Burrito<A> {}
+ | -- ^^ ^^^^^^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required for `&Burrito<Q>` to implement `T1`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:74:17
+ |
+LL | impl<'a, T: T2> T1 for &'a T {}
+ | -- ^^ ^^^^^
+ | |
+ | unsatisfied trait bound introduced here
+note: required by a bound in `want`
+ --> $DIR/blame-trait-error-spans-on-exprs.rs:53:12
+ |
+LL | fn want<V: T1>(_x: V) {}
+ | ^^ required by this bound in `want`
+help: consider restricting type parameter `Q`
+ |
+LL | fn example<Q: T3>(q: Q) {
+ | ++++
+
+error: aborting due to 14 previous errors
+
+For more information about this error, try `rustc --explain E0277`.
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-14 21:31:33 +0000