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error on any use of trait alias

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This commit is contained in:
Alex Burka 2017-12-03 12:57:54 -05:00
parent 63f1c24d8a
commit 4029a01984
5 changed files with 49 additions and 9 deletions
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5
src/librustc_typeck/collect.rs
View file

@ -442,9 +442,8 @@ fn convert_item<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, item_id: ast::NodeId) {
tcx.predicates_of(def_id);
},
hir::ItemTraitAlias(..) => {
tcx.generics_of(def_id);
tcx.trait_def(def_id);
tcx.predicates_of(def_id);
span_err!(tcx.sess, it.span, E0645,
"trait aliases are not yet implemented (see issue #41517)");
},
hir::ItemStruct(ref struct_def, _) |
hir::ItemUnion(ref struct_def, _) => {

1
src/librustc_typeck/diagnostics.rs
View file

@ -4721,4 +4721,5 @@ register_diagnostics! {
E0632, // cannot provide explicit type parameters when `impl Trait` is used in
// argument position.
E0641, // cannot cast to/from a pointer with an unknown kind
E0645, // trait aliases not finished
}

2
src/test/compile-fail/trait-alias.rs
View file

@ -9,9 +9,11 @@
// except according to those terms.
trait Alias1<T> = Default where T: Clone; // ok
//~^ERROR trait aliases are not yet implemented
trait Alias2<T: Clone = ()> = Default;
//~^ERROR type parameters on the left side of a trait alias cannot be bounded
//~^^ERROR type parameters on the left side of a trait alias cannot have defaults
//~^^^ERROR trait aliases are not yet implemented
impl Alias1 { //~ERROR expected type, found trait alias
fn foo() {}

12
src/test/run-pass/trait-alias.rs → src/test/ui/trait-alias.rs
View file

@ -8,9 +8,9 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
trait SimpleAlias = Default;
trait GenericAlias<T> = Iterator<Item=T>;
trait Partial<T> = IntoIterator<Item=T>;
trait SimpleAlias = Default; //~ERROR E0645
trait GenericAlias<T> = Iterator<Item=T>; //~ERROR E0645
trait Partial<T> = IntoIterator<Item=T>; //~ERROR E0645
trait Things<T> {}
trait Romeo {}
@ -19,10 +19,10 @@ struct Fore<T>(T);
impl<T, U> Things<T> for The<U> {}
impl<T> Romeo for Fore<T> {}
trait WithWhere<Art, Thou> = Romeo + Romeo where Fore<(Art, Thou)>: Romeo;
trait BareWhere<Wild, Are> = where The<Wild>: Things<Are>;
trait WithWhere<Art, Thou> = Romeo + Romeo where Fore<(Art, Thou)>: Romeo; //~ERROR E0645
trait BareWhere<Wild, Are> = where The<Wild>: Things<Are>; //~ERROR E0645
trait CD = Clone + Default;
trait CD = Clone + Default; //~ERROR E0645
fn foo<T: CD>() -> (T, T) {
let one = T::default();

38
src/test/ui/trait-alias.stderr Normal file
View file

@ -0,0 +1,38 @@
error[E0645]: trait aliases are not yet implemented (see issue #41517)
--> $DIR/trait-alias.rs:11:1
|
11 | trait SimpleAlias = Default; //~ERROR E0645
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0645]: trait aliases are not yet implemented (see issue #41517)
--> $DIR/trait-alias.rs:12:1
|
12 | trait GenericAlias<T> = Iterator<Item=T>; //~ERROR E0645
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0645]: trait aliases are not yet implemented (see issue #41517)
--> $DIR/trait-alias.rs:13:1
|
13 | trait Partial<T> = IntoIterator<Item=T>; //~ERROR E0645
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0645]: trait aliases are not yet implemented (see issue #41517)
--> $DIR/trait-alias.rs:22:1
|
22 | trait WithWhere<Art, Thou> = Romeo + Romeo where Fore<(Art, Thou)>: Romeo; //~ERROR E0645
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0645]: trait aliases are not yet implemented (see issue #41517)
--> $DIR/trait-alias.rs:23:1
|
23 | trait BareWhere<Wild, Are> = where The<Wild>: Things<Are>; //~ERROR E0645
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0645]: trait aliases are not yet implemented (see issue #41517)
--> $DIR/trait-alias.rs:25:1
|
25 | trait CD = Clone + Default; //~ERROR E0645
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 6 previous errors