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Rollup merge of #106524 - compiler-errors:constructor-note, r=cjgillot

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Label `struct/enum constructor` instead of `fn item`, mention that it should be called on type mismatch

Fixes #106516
This commit is contained in:
Michael Goulet 2023-01-11 22:25:49 -08:00 committed by GitHub
commit d7113948d3
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GPG Key ID: 4AEE18F83AFDEB23
14 changed files with 78 additions and 60 deletions
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18
compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
View File

@ -5,7 +5,7 @@ use crate::method::probe::{IsSuggestion, Mode, ProbeScope};
use rustc_ast::util::parser::{ExprPrecedence, PREC_POSTFIX};
use rustc_errors::{Applicability, Diagnostic, MultiSpan};
use rustc_hir as hir;
use rustc_hir::def::{CtorOf, DefKind};
use rustc_hir::def::{CtorKind, CtorOf, DefKind};
use rustc_hir::lang_items::LangItem;
use rustc_hir::{
Expr, ExprKind, GenericBound, Node, Path, QPath, Stmt, StmtKind, TyKind, WherePredicate,
@ -417,10 +417,20 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
} else if self.suggest_else_fn_with_closure(err, expr, found, expected) {
return true;
} else if self.suggest_fn_call(err, expr, found, |output| self.can_coerce(output, expected))
&& let ty::FnDef(def_id, ..) = &found.kind()
&& let Some(sp) = self.tcx.hir().span_if_local(*def_id)
&& let ty::FnDef(def_id, ..) = *found.kind()
&& let Some(sp) = self.tcx.hir().span_if_local(def_id)
{
err.span_label(sp, format!("{found} defined here"));
let name = self.tcx.item_name(def_id);
let kind = self.tcx.def_kind(def_id);
if let DefKind::Ctor(of, CtorKind::Fn) = kind {
err.span_label(sp, format!("`{name}` defines {} constructor here, which should be called", match of {
CtorOf::Struct => "a struct",
CtorOf::Variant => "an enum variant",
}));
} else {
let descr = kind.descr(def_id);
err.span_label(sp, format!("{descr} `{name}` defined here"));
}
return true;
} else if self.check_for_cast(err, expr, found, expected, expected_ty_expr) {
return true;

14
compiler/rustc_middle/src/ty/error.rs
View File

@ -2,10 +2,10 @@ use crate::traits::{ObligationCause, ObligationCauseCode};
use crate::ty::diagnostics::suggest_constraining_type_param;
use crate::ty::print::{with_forced_trimmed_paths, FmtPrinter, Printer};
use crate::ty::{self, BoundRegionKind, Region, Ty, TyCtxt};
use hir::def::DefKind;
use rustc_errors::Applicability::{MachineApplicable, MaybeIncorrect};
use rustc_errors::{pluralize, Diagnostic, MultiSpan};
use rustc_hir as hir;
use rustc_hir::def::{CtorOf, DefKind};
use rustc_hir::def_id::DefId;
use rustc_span::symbol::{sym, Symbol};
use rustc_span::{BytePos, Span};
@ -319,7 +319,11 @@ impl<'tcx> Ty<'tcx> {
.into()
}
}
ty::FnDef(..) => "fn item".into(),
ty::FnDef(def_id, ..) => match tcx.def_kind(def_id) {
DefKind::Ctor(CtorOf::Struct, _) => "struct constructor".into(),
DefKind::Ctor(CtorOf::Variant, _) => "enum constructor".into(),
_ => "fn item".into(),
},
ty::FnPtr(_) => "fn pointer".into(),
ty::Dynamic(ref inner, ..) if let Some(principal) = inner.principal() => {
format!("trait object `dyn {}`", tcx.def_path_str(principal.def_id())).into()
@ -366,7 +370,11 @@ impl<'tcx> Ty<'tcx> {
_ => "reference",
}
.into(),
ty::FnDef(..) => "fn item".into(),
ty::FnDef(def_id, ..) => match tcx.def_kind(def_id) {
DefKind::Ctor(CtorOf::Struct, _) => "struct constructor".into(),
DefKind::Ctor(CtorOf::Variant, _) => "enum constructor".into(),
_ => "fn item".into(),
},
ty::FnPtr(_) => "fn pointer".into(),
ty::Dynamic(..) => "trait object".into(),
ty::Closure(..) => "closure".into(),

8
tests/ui/associated-types/substs-ppaux.normal.stderr
View File

@ -2,7 +2,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:16:17
|
LL | fn bar<'a, T>() where T: 'a {}
| --------------------------- fn() {<i8 as Foo<'static, 'static, u8>>::bar::<'static, char>} defined here
| --------------------------- associated function `bar` defined here
...
LL | let x: () = <i8 as Foo<'static, 'static, u8>>::bar::<'static, char>;
| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found fn item
@ -20,7 +20,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:25:17
|
LL | fn bar<'a, T>() where T: 'a {}
| --------------------------- fn() {<i8 as Foo<'static, 'static>>::bar::<'static, char>} defined here
| --------------------------- associated function `bar` defined here
...
LL | let x: () = <i8 as Foo<'static, 'static, u32>>::bar::<'static, char>;
| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found fn item
@ -38,7 +38,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:33:17
|
LL | fn baz() {}
| -------- fn() {<i8 as Foo<'static, 'static, u8>>::baz} defined here
| -------- associated function `baz` defined here
...
LL | let x: () = <i8 as Foo<'static, 'static, u8>>::baz;
| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found fn item
@ -56,7 +56,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:41:17
|
LL | fn foo<'z>() where &'z (): Sized {
| -------------------------------- fn() {foo::<'static>} defined here
| -------------------------------- function `foo` defined here
...
LL | let x: () = foo::<'static>;
| -- ^^^^^^^^^^^^^^ expected `()`, found fn item

8
tests/ui/associated-types/substs-ppaux.verbose.stderr
View File

@ -2,7 +2,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:16:17
|
LL | fn bar<'a, T>() where T: 'a {}
| --------------------------- fn() {<i8 as Foo<ReStatic, ReStatic, u8>>::bar::<ReStatic, char>} defined here
| --------------------------- associated function `bar` defined here
...
LL | let x: () = <i8 as Foo<'static, 'static, u8>>::bar::<'static, char>;
| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found fn item
@ -20,7 +20,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:25:17
|
LL | fn bar<'a, T>() where T: 'a {}
| --------------------------- fn() {<i8 as Foo<ReStatic, ReStatic>>::bar::<ReStatic, char>} defined here
| --------------------------- associated function `bar` defined here
...
LL | let x: () = <i8 as Foo<'static, 'static, u32>>::bar::<'static, char>;
| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found fn item
@ -38,7 +38,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:33:17
|
LL | fn baz() {}
| -------- fn() {<i8 as Foo<ReStatic, ReStatic, u8>>::baz} defined here
| -------- associated function `baz` defined here
...
LL | let x: () = <i8 as Foo<'static, 'static, u8>>::baz;
| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found fn item
@ -56,7 +56,7 @@ error[E0308]: mismatched types
--> $DIR/substs-ppaux.rs:41:17
|
LL | fn foo<'z>() where &'z (): Sized {
| -------------------------------- fn() {foo::<ReStatic>} defined here
| -------------------------------- function `foo` defined here
...
LL | let x: () = foo::<'static>;
| -- ^^^^^^^^^^^^^^ expected `()`, found fn item

8
tests/ui/issues/issue-35241.stderr
View File

@ -2,15 +2,15 @@ error[E0308]: mismatched types
--> $DIR/issue-35241.rs:3:20
|
LL | struct Foo(u32);
| ---------- fn(u32) -> Foo {Foo} defined here
| ---------- `Foo` defines a struct constructor here, which should be called
LL |
LL | fn test() -> Foo { Foo }
| --- ^^^ expected struct `Foo`, found fn item
| --- ^^^ expected struct `Foo`, found struct constructor
| |
| expected `Foo` because of return type
|
= note: expected struct `Foo`
found fn item `fn(u32) -> Foo {Foo}`
= note: expected struct `Foo`
found struct constructor `fn(u32) -> Foo {Foo}`
help: use parentheses to construct this tuple struct
|
LL | fn test() -> Foo { Foo(/* u32 */) }

24
tests/ui/resolve/privacy-enum-ctor.stderr
View File

@ -264,15 +264,15 @@ error[E0308]: mismatched types
--> $DIR/privacy-enum-ctor.rs:27:20
|
LL | Fn(u8),
| -- fn(u8) -> Z {Z::Fn} defined here
| -- `Fn` defines an enum variant constructor here, which should be called
...
LL | let _: Z = Z::Fn;
| - ^^^^^ expected enum `Z`, found fn item
| - ^^^^^ expected enum `Z`, found enum constructor
| |
| expected due to this
|
= note: expected enum `Z`
found fn item `fn(u8) -> Z {Z::Fn}`
= note: expected enum `Z`
found enum constructor `fn(u8) -> Z {Z::Fn}`
help: use parentheses to construct this tuple variant
|
LL | let _: Z = Z::Fn(/* u8 */);
@ -305,15 +305,15 @@ error[E0308]: mismatched types
--> $DIR/privacy-enum-ctor.rs:43:16
|
LL | Fn(u8),
| -- fn(u8) -> E {E::Fn} defined here
| -- `Fn` defines an enum variant constructor here, which should be called
...
LL | let _: E = m::E::Fn;
| - ^^^^^^^^ expected enum `E`, found fn item
| - ^^^^^^^^ expected enum `E`, found enum constructor
| |
| expected due to this
|
= note: expected enum `E`
found fn item `fn(u8) -> E {E::Fn}`
= note: expected enum `E`
found enum constructor `fn(u8) -> E {E::Fn}`
help: use parentheses to construct this tuple variant
|
LL | let _: E = m::E::Fn(/* u8 */);
@ -346,15 +346,15 @@ error[E0308]: mismatched types
--> $DIR/privacy-enum-ctor.rs:51:16
|
LL | Fn(u8),
| -- fn(u8) -> E {E::Fn} defined here
| -- `Fn` defines an enum variant constructor here, which should be called
...
LL | let _: E = E::Fn;
| - ^^^^^ expected enum `E`, found fn item
| - ^^^^^ expected enum `E`, found enum constructor
| |
| expected due to this
|
= note: expected enum `E`
found fn item `fn(u8) -> E {E::Fn}`
= note: expected enum `E`
found enum constructor `fn(u8) -> E {E::Fn}`
help: use parentheses to construct this tuple variant
|
LL | let _: E = E::Fn(/* u8 */);

44
tests/ui/suggestions/fn-or-tuple-struct-without-args.stderr
View File

@ -2,7 +2,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:29:20
|
LL | fn foo(a: usize, b: usize) -> usize { a }
| ----------------------------------- fn(usize, usize) -> usize {foo} defined here
| ----------------------------------- function `foo` defined here
...
LL | let _: usize = foo;
| ----- ^^^ expected `usize`, found fn item
@ -20,15 +20,15 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:30:16
|
LL | struct S(usize, usize);
| -------- fn(usize, usize) -> S {S} defined here
| -------- `S` defines a struct constructor here, which should be called
...
LL | let _: S = S;
| - ^ expected struct `S`, found fn item
| - ^ expected struct `S`, found struct constructor
| |
| expected due to this
|
= note: expected struct `S`
found fn item `fn(usize, usize) -> S {S}`
= note: expected struct `S`
found struct constructor `fn(usize, usize) -> S {S}`
help: use parentheses to construct this tuple struct
|
LL | let _: S = S(/* usize */, /* usize */);
@ -38,7 +38,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:31:20
|
LL | fn bar() -> usize { 42 }
| ----------------- fn() -> usize {bar} defined here
| ----------------- function `bar` defined here
...
LL | let _: usize = bar;
| ----- ^^^ expected `usize`, found fn item
@ -56,15 +56,15 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:32:16
|
LL | struct V();
| -------- fn() -> V {V} defined here
| -------- `V` defines a struct constructor here, which should be called
...
LL | let _: V = V;
| - ^ expected struct `V`, found fn item
| - ^ expected struct `V`, found struct constructor
| |
| expected due to this
|
= note: expected struct `V`
found fn item `fn() -> V {V}`
= note: expected struct `V`
found struct constructor `fn() -> V {V}`
help: use parentheses to construct this tuple struct
|
LL | let _: V = V();
@ -74,7 +74,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:33:20
|
LL | fn baz(x: usize, y: usize) -> usize { x }
| ----------------------------------- fn(usize, usize) -> usize {<_ as T>::baz} defined here
| ----------------------------------- associated function `baz` defined here
...
LL | let _: usize = T::baz;
| ----- ^^^^^^ expected `usize`, found fn item
@ -92,7 +92,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:34:20
|
LL | fn bat(x: usize) -> usize { 42 }
| ------------------------- fn(usize) -> usize {<_ as T>::bat} defined here
| ------------------------- associated function `bat` defined here
...
LL | let _: usize = T::bat;
| ----- ^^^^^^ expected `usize`, found fn item
@ -110,15 +110,15 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:35:16
|
LL | A(usize),
| - fn(usize) -> E {E::A} defined here
| - `A` defines an enum variant constructor here, which should be called
...
LL | let _: E = E::A;
| - ^^^^ expected enum `E`, found fn item
| - ^^^^ expected enum `E`, found enum constructor
| |
| expected due to this
|
= note: expected enum `E`
found fn item `fn(usize) -> E {E::A}`
= note: expected enum `E`
found enum constructor `fn(usize) -> E {E::A}`
help: use parentheses to construct this tuple variant
|
LL | let _: E = E::A(/* usize */);
@ -134,7 +134,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:37:20
|
LL | fn baz(x: usize, y: usize) -> usize { x }
| ----------------------------------- fn(usize, usize) -> usize {<X as T>::baz} defined here
| ----------------------------------- associated function `baz` defined here
...
LL | let _: usize = X::baz;
| ----- ^^^^^^ expected `usize`, found fn item
@ -152,7 +152,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:38:20
|
LL | fn bat(x: usize) -> usize { 42 }
| ------------------------- fn(usize) -> usize {<X as T>::bat} defined here
| ------------------------- associated function `bat` defined here
...
LL | let _: usize = X::bat;
| ----- ^^^^^^ expected `usize`, found fn item
@ -170,7 +170,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:39:20
|
LL | fn bax(x: usize) -> usize { 42 }
| ------------------------- fn(usize) -> usize {<X as T>::bax} defined here
| ------------------------- associated function `bax` defined here
...
LL | let _: usize = X::bax;
| ----- ^^^^^^ expected `usize`, found fn item
@ -188,7 +188,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:40:20
|
LL | fn bach(x: usize) -> usize;
| --------------------------- fn(usize) -> usize {<X as T>::bach} defined here
| --------------------------- associated function `bach` defined here
...
LL | let _: usize = X::bach;
| ----- ^^^^^^^ expected `usize`, found fn item
@ -206,7 +206,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:41:20
|
LL | fn ban(&self) -> usize { 42 }
| ---------------------- for<'a> fn(&'a X) -> usize {<X as T>::ban} defined here
| ---------------------- associated function `ban` defined here
...
LL | let _: usize = X::ban;
| ----- ^^^^^^ expected `usize`, found fn item
@ -224,7 +224,7 @@ error[E0308]: mismatched types
--> $DIR/fn-or-tuple-struct-without-args.rs:42:20
|
LL | fn bal(&self) -> usize;
| ----------------------- for<'a> fn(&'a X) -> usize {<X as T>::bal} defined here
| ----------------------- associated function `bal` defined here
...
LL | let _: usize = X::bal;
| ----- ^^^^^^ expected `usize`, found fn item

2
tests/ui/typeck/issue-87181/empty-tuple-method.rs
View File

@ -10,5 +10,5 @@ impl Foo {
fn main() {
let thing = Bar { bar: Foo };
thing.bar.foo();
//~^ ERROR no method named `foo` found for fn item `fn() -> Foo {Foo}` in the current scope [E0599]
//~^ ERROR no method named `foo` found for struct constructor `fn() -> Foo {Foo}` in the current scope [E0599]
}

2
tests/ui/typeck/issue-87181/empty-tuple-method.stderr
View File

@ -1,4 +1,4 @@
error[E0599]: no method named `foo` found for fn item `fn() -> Foo {Foo}` in the current scope
error[E0599]: no method named `foo` found for struct constructor `fn() -> Foo {Foo}` in the current scope
--> $DIR/empty-tuple-method.rs:12:15
|
LL | thing.bar.foo();

2
tests/ui/typeck/issue-87181/enum-variant.rs
View File

@ -12,5 +12,5 @@ impl Foo {
fn main() {
let thing = Bar { bar: Foo::Tup };
thing.bar.foo();
//~^ ERROR no method named `foo` found for fn item `fn() -> Foo {Foo::Tup}` in the current scope [E0599]
//~^ ERROR no method named `foo` found for enum constructor `fn() -> Foo {Foo::Tup}` in the current scope [E0599]
}

2
tests/ui/typeck/issue-87181/enum-variant.stderr
View File

@ -1,4 +1,4 @@
error[E0599]: no method named `foo` found for fn item `fn() -> Foo {Foo::Tup}` in the current scope
error[E0599]: no method named `foo` found for enum constructor `fn() -> Foo {Foo::Tup}` in the current scope
--> $DIR/enum-variant.rs:14:15
|
LL | thing.bar.foo();

2
tests/ui/typeck/issue-87181/tuple-method.rs
View File

@ -10,5 +10,5 @@ impl Foo {
fn main() {
let thing = Bar { bar: Foo };
thing.bar.foo();
//~^ ERROR no method named `foo` found for fn item `fn(u8, i32) -> Foo {Foo}` in the current scope [E0599]
//~^ ERROR no method named `foo` found for struct constructor `fn(u8, i32) -> Foo {Foo}` in the current scope [E0599]
}

2
tests/ui/typeck/issue-87181/tuple-method.stderr
View File

@ -1,4 +1,4 @@
error[E0599]: no method named `foo` found for fn item `fn(u8, i32) -> Foo {Foo}` in the current scope
error[E0599]: no method named `foo` found for struct constructor `fn(u8, i32) -> Foo {Foo}` in the current scope
--> $DIR/tuple-method.rs:12:15
|
LL | thing.bar.foo();

2
tests/ui/typeck/issue-96738.stderr
View File

@ -1,4 +1,4 @@
error[E0599]: no method named `nonexistent_method` found for fn item `fn(_) -> Option<_> {Option::<_>::Some}` in the current scope
error[E0599]: no method named `nonexistent_method` found for enum constructor `fn(_) -> Option<_> {Option::<_>::Some}` in the current scope
--> $DIR/issue-96738.rs:2:10
|
LL | Some.nonexistent_method();