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Merge pull request #2769 from dtolnay/onunimpl
Add ui test of unsatisfied serde trait bound
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,23 @@ | ||
use serde::de::Deserialize; | ||
use serde::ser::Serialize; | ||
|
||
fn to_string<T>(_: &T) -> String | ||
where | ||
T: Serialize, | ||
{ | ||
unimplemented!() | ||
} | ||
|
||
fn from_str<'de, T>(_: &'de str) -> T | ||
where | ||
T: Deserialize<'de>, | ||
{ | ||
unimplemented!() | ||
} | ||
|
||
struct MyStruct; | ||
|
||
fn main() { | ||
to_string(&MyStruct); | ||
let _: MyStruct = from_str(""); | ||
} |
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error[E0277]: the trait bound `MyStruct: Serialize` is not satisfied | ||
--> tests/ui/on_unimplemented.rs:21:15 | ||
| | ||
21 | to_string(&MyStruct); | ||
| --------- ^^^^^^^^^ the trait `Serialize` is not implemented for `MyStruct` | ||
| | | ||
| required by a bound introduced by this call | ||
| | ||
= note: for local types consider adding `#[derive(serde::Serialize)]` to your `MyStruct` type | ||
= note: for types from other crates check whether the crate offers a `serde` feature flag | ||
= help: the following other types implement trait `Serialize`: | ||
&'a T | ||
&'a mut T | ||
() | ||
(T,) | ||
(T0, T1) | ||
(T0, T1, T2) | ||
(T0, T1, T2, T3) | ||
(T0, T1, T2, T3, T4) | ||
and $N others | ||
note: required by a bound in `to_string` | ||
--> tests/ui/on_unimplemented.rs:6:8 | ||
| | ||
4 | fn to_string<T>(_: &T) -> String | ||
| --------- required by a bound in this function | ||
5 | where | ||
6 | T: Serialize, | ||
| ^^^^^^^^^ required by this bound in `to_string` | ||
|
||
error[E0277]: the trait bound `MyStruct: Deserialize<'_>` is not satisfied | ||
--> tests/ui/on_unimplemented.rs:22:23 | ||
| | ||
22 | let _: MyStruct = from_str(""); | ||
| ^^^^^^^^^^^^ the trait `Deserialize<'_>` is not implemented for `MyStruct` | ||
| | ||
= note: for local types consider adding `#[derive(serde::Deserialize)]` to your `MyStruct` type | ||
= note: for types from other crates check whether the crate offers a `serde` feature flag | ||
= help: the following other types implement trait `Deserialize<'de>`: | ||
&'a Path | ||
&'a [u8] | ||
&'a str | ||
() | ||
(T,) | ||
(T0, T1) | ||
(T0, T1, T2) | ||
(T0, T1, T2, T3) | ||
and $N others | ||
note: required by a bound in `from_str` | ||
--> tests/ui/on_unimplemented.rs:13:8 | ||
| | ||
11 | fn from_str<'de, T>(_: &'de str) -> T | ||
| -------- required by a bound in this function | ||
12 | where | ||
13 | T: Deserialize<'de>, | ||
| ^^^^^^^^^^^^^^^^ required by this bound in `from_str` |