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Rollup merge of #105552 - mattjperez:add-incompatible-types-note, r=c…
…ompiler-errors Add help message about function pointers #102608
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,53 +1,52 @@ | ||
| // Test that the types of distinct fn items are not compatible by | ||
| // default. See also `run-pass/fn-item-type-*.rs`. | ||
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||
| fn foo<T>(x: isize) -> isize { x * 2 } | ||
| fn bar<T>(x: isize) -> isize { x * 4 } | ||
| fn foo<T>(x: isize) -> isize { | ||
| x * 2 | ||
| } | ||
| fn bar<T>(x: isize) -> isize { | ||
| x * 4 | ||
| } | ||
|
|
||
| fn eq<T>(x: T, y: T) { } | ||
| fn eq<T>(x: T, y: T) {} | ||
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| trait Foo { fn foo() { /* this is a default fn */ } } | ||
| impl<T> Foo for T { /* `foo` is still default here */ } | ||
| trait Foo { | ||
| fn foo() { /* this is a default fn */ | ||
| } | ||
| } | ||
| impl<T> Foo for T { | ||
| /* `foo` is still default here */ | ||
| } | ||
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||
| fn main() { | ||
| eq(foo::<u8>, bar::<u8>); | ||
| //~^ ERROR mismatched types | ||
| //~| expected fn item `fn(_) -> _ {foo::<u8>}` | ||
| //~| found fn item `fn(_) -> _ {bar::<u8>}` | ||
| //~| expected fn item, found a different fn item | ||
| //~| different `fn` items always have unique types, even if their signatures are the same | ||
| //~| change the expected type to be function pointer | ||
| //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer | ||
| //~| different fn items have unique types, even if their signatures are the same | ||
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| eq(foo::<u8>, foo::<i8>); | ||
| //~^ ERROR mismatched types | ||
| //~| expected `u8`, found `i8` | ||
| //~| different `fn` items always have unique types, even if their signatures are the same | ||
| //~| change the expected type to be function pointer | ||
| //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer | ||
| //~| different fn items have unique types, even if their signatures are the same | ||
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| eq(bar::<String>, bar::<Vec<u8>>); | ||
| //~^ ERROR mismatched types | ||
| //~| found fn item `fn(_) -> _ {bar::<Vec<u8>>}` | ||
| //~| expected struct `String`, found struct `Vec` | ||
| //~| different `fn` items always have unique types, even if their signatures are the same | ||
| //~| change the expected type to be function pointer | ||
| //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer | ||
| //~| different fn items have unique types, even if their signatures are the same | ||
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| // Make sure we distinguish between trait methods correctly. | ||
| eq(<u8 as Foo>::foo, <u16 as Foo>::foo); | ||
| //~^ ERROR mismatched types | ||
| //~| expected `u8`, found `u16` | ||
| //~| different `fn` items always have unique types, even if their signatures are the same | ||
| //~| change the expected type to be function pointer | ||
| //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer | ||
| //~| different fn items have unique types, even if their signatures are the same | ||
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| eq(foo::<u8>, bar::<u8> as fn(isize) -> isize); | ||
| //~^ ERROR mismatched types | ||
| //~| found fn pointer `fn(_) -> _` | ||
| //~| expected fn item, found fn pointer | ||
| //~| change the expected type to be function pointer | ||
| //~| if the expected type is due to type inference, cast the expected `fn` to a function pointer | ||
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| eq(foo::<u8> as fn(isize) -> isize, bar::<u8>); // ok! | ||
| } |
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