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https://github.com/rust-lang/rust
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91b9ffeab0
In `report_fullfillment_errors` push back `T: Sized`, `T: WellFormed` and coercion errors to the end of the list. The pre-existing deduplication logic eliminates redundant errors better that way, keeping the resulting output with fewer errors than before, while also having more detail.
49 lines
775 B
Rust
49 lines
775 B
Rust
struct Foo {
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inner: u32,
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}
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struct Bar {
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inner: u32,
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}
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#[derive(Clone, Copy)]
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struct Baz {
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inner: u32,
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}
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impl From<Baz> for Bar {
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fn from(other: Baz) -> Self {
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Self {
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inner: other.inner,
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}
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}
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}
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impl From<Baz> for Foo {
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fn from(other: Baz) -> Self {
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Self {
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inner: other.inner,
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}
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}
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}
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fn main() {
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let x: Baz = Baz { inner: 42 };
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// DOESN'T Compile: Multiple options!
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let y = x.into(); //~ ERROR E0283
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let y_1: Foo = x.into();
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let y_2: Bar = x.into();
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let z_1 = Foo::from(y_1);
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let z_2 = Bar::from(y_2);
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// No type annotations needed, the compiler KNOWS the type must be `Foo`!
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let m = magic_foo(x);
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}
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fn magic_foo(arg: Baz) -> Foo {
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arg.into()
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}
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