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Rollup merge of #68071 - estebank:ice-67995, r=Centril

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Extend support of `_` in type parameters

 - Account for `impl Trait<_>`.
 - Provide a reasonable `Span` for empty `Generics` in `impl`s.
 - Account for `fn foo<_>(_: _) {}` to suggest `fn foo<T>(_: T) {}`.
 - Fix #67995. Follow up to #67597.
This commit is contained in:
Mazdak Farrokhzad 2020-01-10 02:47:34 +01:00 • committed by GitHub
commit 2307f0c4ea
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 284 additions and 95 deletions
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2
src/librustc_parse/parser/generics.rs
View file

@ -156,7 +156,7 @@ impl<'a> Parser<'a> {
self.expect_gt()?;
(params, span_lo.to(self.prev_span))
} else {
(vec![], self.prev_span.between(self.token.span))
(vec![], self.prev_span.shrink_to_hi())
};
Ok(ast::Generics {
params,

6
src/librustc_parse/parser/item.rs
View file

@ -556,7 +556,11 @@ impl<'a> Parser<'a> {
let mut generics = if self.choose_generics_over_qpath() {
self.parse_generics()?
} else {
Generics::default()
let mut generics = Generics::default();
// impl A for B {}
// /\ this is where `generics.span` should point when there are no type params.
generics.span = self.prev_span.shrink_to_hi();
generics
};
let constness = if self.eat_keyword(kw::Const) {

2
src/librustc_typeck/astconv.rs
View file

@ -2803,7 +2803,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
// allowed. `allow_ty_infer` gates this behavior.
crate::collect::placeholder_type_error(
tcx,
ident_span.unwrap_or(DUMMY_SP),
ident_span.map(|sp| sp.shrink_to_hi()).unwrap_or(DUMMY_SP),
generic_params,
visitor.0,
ident_span.is_some(),

36
src/librustc_typeck/collect.rs
View file

@ -127,7 +127,7 @@ struct CollectItemTypesVisitor<'tcx> {
/// all already existing generic type parameters to avoid suggesting a name that is already in use.
crate fn placeholder_type_error(
tcx: TyCtxt<'tcx>,
ident_span: Span,
span: Span,
generics: &[hir::GenericParam<'_>],
placeholder_types: Vec<Span>,
suggest: bool,
@ -153,7 +153,14 @@ crate fn placeholder_type_error(
let mut sugg: Vec<_> =
placeholder_types.iter().map(|sp| (*sp, type_name.to_string())).collect();
if generics.is_empty() {
sugg.push((ident_span.shrink_to_hi(), format!("<{}>", type_name)));
sugg.push((span, format!("<{}>", type_name)));
} else if let Some(arg) = generics.iter().find(|arg| match arg.name {
hir::ParamName::Plain(Ident { name: kw::Underscore, .. }) => true,
_ => false,
}) {
// Account for `_` already present in cases like `struct S<_>(_);` and suggest
// `struct S<T>(T);` instead of `struct S<_, T>(T);`.
sugg.push((arg.span, format!("{}", type_name)));
} else {
sugg.push((
generics.iter().last().unwrap().span.shrink_to_hi(),
@ -175,8 +182,12 @@ fn reject_placeholder_type_signatures_in_item(tcx: TyCtxt<'tcx>, item: &'tcx hir
let (generics, suggest) = match &item.kind {
hir::ItemKind::Union(_, generics)
| hir::ItemKind::Enum(_, generics)
| hir::ItemKind::Struct(_, generics) => (&generics.params[..], true),
hir::ItemKind::TyAlias(_, generics) => (&generics.params[..], false),
| hir::ItemKind::TraitAlias(generics, _)
| hir::ItemKind::Trait(_, _, generics, ..)
| hir::ItemKind::Impl(_, _, _, generics, ..)
| hir::ItemKind::Struct(_, generics) => (generics, true),
hir::ItemKind::OpaqueTy(hir::OpaqueTy { generics, .. })
| hir::ItemKind::TyAlias(_, generics) => (generics, false),
// `static`, `fn` and `const` are handled elsewhere to suggest appropriate type.
_ => return,
};
@ -184,7 +195,7 @@ fn reject_placeholder_type_signatures_in_item(tcx: TyCtxt<'tcx>, item: &'tcx hir
let mut visitor = PlaceholderHirTyCollector::default();
visitor.visit_item(item);
placeholder_type_error(tcx, item.ident.span, generics, visitor.0, suggest);
placeholder_type_error(tcx, generics.span, &generics.params[..], visitor.0, suggest);
}
impl Visitor<'tcx> for CollectItemTypesVisitor<'tcx> {
@ -1798,10 +1809,19 @@ fn find_opaque_ty_constraints(tcx: TyCtxt<'_>, def_id: DefId) -> Ty<'_> {
/// Whether `ty` is a type with `_` placeholders that can be infered. Used in diagnostics only to
/// use inference to provide suggestions for the appropriate type if possible.
fn is_suggestable_infer_ty(ty: &hir::Ty<'_>) -> bool {
use hir::TyKind::*;
match &ty.kind {
hir::TyKind::Infer => true,
hir::TyKind::Slice(ty) | hir::TyKind::Array(ty, _) => is_suggestable_infer_ty(ty),
hir::TyKind::Tup(tys) => tys.iter().any(|ty| is_suggestable_infer_ty(ty)),
Infer => true,
Slice(ty) | Array(ty, _) => is_suggestable_infer_ty(ty),
Tup(tys) => tys.iter().any(is_suggestable_infer_ty),
Ptr(mut_ty) | Rptr(_, mut_ty) => is_suggestable_infer_ty(mut_ty.ty),
Def(_, generic_args) => generic_args
.iter()
.filter_map(|arg| match arg {
hir::GenericArg::Type(ty) => Some(ty),
_ => None,
})
.any(is_suggestable_infer_ty),
_ => false,
}
}

45
src/test/ui/typeck/typeck_type_placeholder_item.rs
View file

@ -1,3 +1,4 @@
#![feature(type_alias_impl_trait)] // Needed for single test `type Y = impl Trait<_>`
// This test checks that it is not possible to enable global type
// inference by using the `_` type placeholder.
@ -42,6 +43,16 @@ impl Test9 {
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
}
fn test11(x: &usize) -> &_ {
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
&x
}
unsafe fn test12(x: *const usize) -> *const *const _ {
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
&x
}
impl Clone for Test9 {
fn clone(&self) -> _ { Test9 }
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
@ -131,3 +142,37 @@ trait T {
fn assoc_fn_test3() -> _;
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
}
struct BadStruct<_>(_);
//~^ ERROR expected identifier, found reserved identifier `_`
//~| ERROR the type placeholder `_` is not allowed within types on item signatures
trait BadTrait<_> {}
//~^ ERROR expected identifier, found reserved identifier `_`
impl BadTrait<_> for BadStruct<_> {}
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
fn impl_trait() -> impl BadTrait<_> {
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
unimplemented!()
}
struct BadStruct1<_, _>(_);
//~^ ERROR expected identifier, found reserved identifier `_`
//~| ERROR expected identifier, found reserved identifier `_`
//~| ERROR the name `_` is already used
//~| ERROR the type placeholder `_` is not allowed within types on item signatures
struct BadStruct2<_, T>(_, T);
//~^ ERROR expected identifier, found reserved identifier `_`
//~| ERROR the type placeholder `_` is not allowed within types on item signatures
type X = Box<_>;
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
struct Struct;
trait Trait<T> {}
impl Trait<usize> for Struct {}
type Y = impl Trait<_>;
//~^ ERROR the type placeholder `_` is not allowed within types on item signatures
fn foo() -> Y {
Struct
}

288
src/test/ui/typeck/typeck_type_placeholder_item.stderr
View file

@ -1,5 +1,43 @@
error: expected identifier, found reserved identifier `_`
--> $DIR/typeck_type_placeholder_item.rs:146:18
|
LL | struct BadStruct<_>(_);
| ^ expected identifier, found reserved identifier
error: expected identifier, found reserved identifier `_`
--> $DIR/typeck_type_placeholder_item.rs:149:16
|
LL | trait BadTrait<_> {}
| ^ expected identifier, found reserved identifier
error: expected identifier, found reserved identifier `_`
--> $DIR/typeck_type_placeholder_item.rs:159:19
|
LL | struct BadStruct1<_, _>(_);
| ^ expected identifier, found reserved identifier
error: expected identifier, found reserved identifier `_`
--> $DIR/typeck_type_placeholder_item.rs:159:22
|
LL | struct BadStruct1<_, _>(_);
| ^ expected identifier, found reserved identifier
error: expected identifier, found reserved identifier `_`
--> $DIR/typeck_type_placeholder_item.rs:164:19
|
LL | struct BadStruct2<_, T>(_, T);
| ^ expected identifier, found reserved identifier
error[E0403]: the name `_` is already used for a generic parameter in this item's generic parameters
--> $DIR/typeck_type_placeholder_item.rs:159:22
|
LL | struct BadStruct1<_, _>(_);
| - ^ already used
| |
| first use of `_`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:4:14
--> $DIR/typeck_type_placeholder_item.rs:5:14
|
LL | fn test() -> _ { 5 }
| ^
@ -8,7 +46,7 @@ LL | fn test() -> _ { 5 }
| help: replace with the correct return type: `i32`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:7:16
--> $DIR/typeck_type_placeholder_item.rs:8:16
|
LL | fn test2() -> (_, _) { (5, 5) }
| -^--^-
@ -18,7 +56,7 @@ LL | fn test2() -> (_, _) { (5, 5) }
| help: replace with the correct return type: `(i32, i32)`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:10:15
--> $DIR/typeck_type_placeholder_item.rs:11:15
|
LL | static TEST3: _ = "test";
| ^
@ -27,7 +65,7 @@ LL | static TEST3: _ = "test";
| help: replace `_` with the correct type: `&'static str`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:13:15
--> $DIR/typeck_type_placeholder_item.rs:14:15
|
LL | static TEST4: _ = 145;
| ^
@ -36,13 +74,13 @@ LL | static TEST4: _ = 145;
| help: replace `_` with the correct type: `i32`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:16:15
--> $DIR/typeck_type_placeholder_item.rs:17:15
|
LL | static TEST5: (_, _) = (1, 2);
| ^^^^^^ not allowed in type signatures
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:19:13
--> $DIR/typeck_type_placeholder_item.rs:20:13
|
LL | fn test6(_: _) { }
| ^ not allowed in type signatures
@ -53,7 +91,7 @@ LL | fn test6<T>(_: T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:22:18
--> $DIR/typeck_type_placeholder_item.rs:23:18
|
LL | fn test6_b<T>(_: _, _: T) { }
| ^ not allowed in type signatures
@ -64,7 +102,7 @@ LL | fn test6_b<T, K>(_: K, _: T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:25:30
--> $DIR/typeck_type_placeholder_item.rs:26:30
|
LL | fn test6_c<T, K, L, A, B>(_: _, _: (T, K, L, A, B)) { }
| ^ not allowed in type signatures
@ -75,7 +113,7 @@ LL | fn test6_c<T, K, L, A, B, C>(_: C, _: (T, K, L, A, B)) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:28:13
--> $DIR/typeck_type_placeholder_item.rs:29:13
|
LL | fn test7(x: _) { let _x: usize = x; }
| ^ not allowed in type signatures
@ -86,13 +124,13 @@ LL | fn test7<T>(x: T) { let _x: usize = x; }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:31:22
--> $DIR/typeck_type_placeholder_item.rs:32:22
|
LL | fn test8(_f: fn() -> _) { }
| ^ not allowed in type signatures
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:31:22
--> $DIR/typeck_type_placeholder_item.rs:32:22
|
LL | fn test8(_f: fn() -> _) { }
| ^ not allowed in type signatures
@ -103,7 +141,25 @@ LL | fn test8<T>(_f: fn() -> T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:54:8
--> $DIR/typeck_type_placeholder_item.rs:46:26
|
LL | fn test11(x: &usize) -> &_ {
| -^
| ||
| |not allowed in type signatures
| help: replace with the correct return type: `&&usize`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:51:52
|
LL | unsafe fn test12(x: *const usize) -> *const *const _ {
| --------------^
| | |
| | not allowed in type signatures
| help: replace with the correct return type: `*const *const usize`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:65:8
|
LL | a: _,
| ^ not allowed in type signatures
@ -122,7 +178,7 @@ LL | b: (T, T),
|
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:60:21
--> $DIR/typeck_type_placeholder_item.rs:71:21
|
LL | fn fn_test() -> _ { 5 }
| ^
@ -131,7 +187,7 @@ LL | fn fn_test() -> _ { 5 }
| help: replace with the correct return type: `i32`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:63:23
--> $DIR/typeck_type_placeholder_item.rs:74:23
|
LL | fn fn_test2() -> (_, _) { (5, 5) }
| -^--^-
@ -141,7 +197,7 @@ LL | fn fn_test2() -> (_, _) { (5, 5) }
| help: replace with the correct return type: `(i32, i32)`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:66:22
--> $DIR/typeck_type_placeholder_item.rs:77:22
|
LL | static FN_TEST3: _ = "test";
| ^
@ -150,7 +206,7 @@ LL | static FN_TEST3: _ = "test";
| help: replace `_` with the correct type: `&'static str`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:69:22
--> $DIR/typeck_type_placeholder_item.rs:80:22
|
LL | static FN_TEST4: _ = 145;
| ^
@ -159,13 +215,13 @@ LL | static FN_TEST4: _ = 145;
| help: replace `_` with the correct type: `i32`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:72:22
--> $DIR/typeck_type_placeholder_item.rs:83:22
|
LL | static FN_TEST5: (_, _) = (1, 2);
| ^^^^^^ not allowed in type signatures
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:75:20
--> $DIR/typeck_type_placeholder_item.rs:86:20
|
LL | fn fn_test6(_: _) { }
| ^ not allowed in type signatures
@ -176,7 +232,7 @@ LL | fn fn_test6<T>(_: T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:78:20
--> $DIR/typeck_type_placeholder_item.rs:89:20
|
LL | fn fn_test7(x: _) { let _x: usize = x; }
| ^ not allowed in type signatures
@ -187,13 +243,13 @@ LL | fn fn_test7<T>(x: T) { let _x: usize = x; }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:81:29
--> $DIR/typeck_type_placeholder_item.rs:92:29
|
LL | fn fn_test8(_f: fn() -> _) { }
| ^ not allowed in type signatures
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:81:29
--> $DIR/typeck_type_placeholder_item.rs:92:29
|
LL | fn fn_test8(_f: fn() -> _) { }
| ^ not allowed in type signatures
@ -204,7 +260,7 @@ LL | fn fn_test8<T>(_f: fn() -> T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:104:12
--> $DIR/typeck_type_placeholder_item.rs:115:12
|
LL | a: _,
| ^ not allowed in type signatures
@ -223,13 +279,13 @@ LL | b: (T, T),
|
error[E0282]: type annotations needed
--> $DIR/typeck_type_placeholder_item.rs:109:27
--> $DIR/typeck_type_placeholder_item.rs:120:27
|
LL | fn fn_test11(_: _) -> (_, _) { panic!() }
| ^^^^^^ cannot infer type
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:109:28
--> $DIR/typeck_type_placeholder_item.rs:120:28
|
LL | fn fn_test11(_: _) -> (_, _) { panic!() }
| ^ ^ not allowed in type signatures
@ -237,7 +293,7 @@ LL | fn fn_test11(_: _) -> (_, _) { panic!() }
| not allowed in type signatures
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:113:30
--> $DIR/typeck_type_placeholder_item.rs:124:30
|
LL | fn fn_test12(x: i32) -> (_, _) { (x, x) }
| -^--^-
@ -247,7 +303,7 @@ LL | fn fn_test12(x: i32) -> (_, _) { (x, x) }
| help: replace with the correct return type: `(i32, i32)`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:116:33
--> $DIR/typeck_type_placeholder_item.rs:127:33
|
LL | fn fn_test13(x: _) -> (i32, _) { (x, x) }
| ------^-
@ -256,7 +312,76 @@ LL | fn fn_test13(x: _) -> (i32, _) { (x, x) }
| help: replace with the correct return type: `(i32, i32)`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:121:31
--> $DIR/typeck_type_placeholder_item.rs:146:21
|
LL | struct BadStruct<_>(_);
| ^ not allowed in type signatures
|
help: use type parameters instead
|
LL | struct BadStruct<T>(T);
| ^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:151:15
|
LL | impl BadTrait<_> for BadStruct<_> {}
| ^ ^ not allowed in type signatures
| |
| not allowed in type signatures
|
help: use type parameters instead
|
LL | impl<T> BadTrait<T> for BadStruct<T> {}
| ^^^ ^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:154:34
|
LL | fn impl_trait() -> impl BadTrait<_> {
| ^ not allowed in type signatures
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:159:25
|
LL | struct BadStruct1<_, _>(_);
| ^ not allowed in type signatures
|
help: use type parameters instead
|
LL | struct BadStruct1<T, _>(T);
| ^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:164:25
|
LL | struct BadStruct2<_, T>(_, T);
| ^ not allowed in type signatures
|
help: use type parameters instead
|
LL | struct BadStruct2<K, T>(K, T);
| ^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:168:14
|
LL | type X = Box<_>;
| ^ not allowed in type signatures
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:42:27
|
LL | fn test10(&self, _x : _) { }
| ^ not allowed in type signatures
|
help: use type parameters instead
|
LL | fn test10<T>(&self, _x : T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:132:31
|
LL | fn method_test1(&self, x: _);
| ^ not allowed in type signatures
@ -267,7 +392,7 @@ LL | fn method_test1<T>(&self, x: T);
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:123:31
--> $DIR/typeck_type_placeholder_item.rs:134:31
|
LL | fn method_test2(&self, x: _) -> _;
| ^ ^ not allowed in type signatures
@ -280,7 +405,7 @@ LL | fn method_test2<T>(&self, x: T) -> T;
| ^^^ ^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:125:31
--> $DIR/typeck_type_placeholder_item.rs:136:31
|
LL | fn method_test3(&self) -> _;
| ^ not allowed in type signatures
@ -291,7 +416,7 @@ LL | fn method_test3<T>(&self) -> T;
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:127:26
--> $DIR/typeck_type_placeholder_item.rs:138:26
|
LL | fn assoc_fn_test1(x: _);
| ^ not allowed in type signatures
@ -302,7 +427,7 @@ LL | fn assoc_fn_test1<T>(x: T);
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:129:26
--> $DIR/typeck_type_placeholder_item.rs:140:26
|
LL | fn assoc_fn_test2(x: _) -> _;
| ^ ^ not allowed in type signatures
@ -315,7 +440,7 @@ LL | fn assoc_fn_test2<T>(x: T) -> T;
| ^^^ ^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:131:28
--> $DIR/typeck_type_placeholder_item.rs:142:28
|
LL | fn assoc_fn_test3() -> _;
| ^ not allowed in type signatures
@ -326,36 +451,7 @@ LL | fn assoc_fn_test3<T>() -> T;
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:38:24
|
LL | fn test9(&self) -> _ { () }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `()`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:41:27
|
LL | fn test10(&self, _x : _) { }
| ^ not allowed in type signatures
|
help: use type parameters instead
|
LL | fn test10<T>(&self, _x : T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:46:24
|
LL | fn clone(&self) -> _ { Test9 }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `Test9`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:49:37
--> $DIR/typeck_type_placeholder_item.rs:60:37
|
LL | fn clone_from(&mut self, other: _) { *self = Test9; }
| ^ not allowed in type signatures
@ -366,16 +462,7 @@ LL | fn clone_from<T>(&mut self, other: T) { *self = Test9; }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:88:31
|
LL | fn fn_test9(&self) -> _ { () }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `()`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:91:34
--> $DIR/typeck_type_placeholder_item.rs:102:34
|
LL | fn fn_test10(&self, _x : _) { }
| ^ not allowed in type signatures
@ -386,16 +473,7 @@ LL | fn fn_test10<T>(&self, _x : T) { }
| ^^^ ^
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:96:28
|
LL | fn clone(&self) -> _ { FnTest9 }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `main::FnTest9`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:99:41
--> $DIR/typeck_type_placeholder_item.rs:110:41
|
LL | fn clone_from(&mut self, other: _) { *self = FnTest9; }
| ^ not allowed in type signatures
@ -405,7 +483,49 @@ help: use type parameters instead
LL | fn clone_from<T>(&mut self, other: T) { *self = FnTest9; }
| ^^^ ^
error: aborting due to 40 previous errors
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:174:21
|
LL | type Y = impl Trait<_>;
| ^ not allowed in type signatures
Some errors have detailed explanations: E0121, E0282.
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:39:24
|
LL | fn test9(&self) -> _ { () }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `()`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:57:24
|
LL | fn clone(&self) -> _ { Test9 }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `Test9`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:99:31
|
LL | fn fn_test9(&self) -> _ { () }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `()`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/typeck_type_placeholder_item.rs:107:28
|
LL | fn clone(&self) -> _ { FnTest9 }
| ^
| |
| not allowed in type signatures
| help: replace with the correct return type: `main::FnTest9`
error: aborting due to 55 previous errors
Some errors have detailed explanations: E0121, E0282, E0403.
For more information about an error, try `rustc --explain E0121`.