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Handle more cases of value suggestions

This commit is contained in:
Esteban Küber 2024-04-10 20:01:20 +00:00
parent a983dd8563
commit e17388b809
42 changed files with 273 additions and 133 deletions
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69
compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
View File

@ -652,6 +652,55 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
err
}
fn ty_kind_suggestion(&self, ty: Ty<'tcx>) -> Option<String> {
// Keep in sync with `rustc_hir_analysis/src/check/mod.rs:ty_kind_suggestion`.
// FIXME: deduplicate the above.
let implements_default = |ty| {
let Some(default_trait) = self.infcx.tcx.get_diagnostic_item(sym::Default) else {
return false;
};
self.infcx
.type_implements_trait(default_trait, [ty], self.param_env)
.must_apply_modulo_regions()
};
Some(match ty.kind() {
ty::Never | ty::Error(_) => return None,
ty::Bool => "false".to_string(),
ty::Char => "\'x\'".to_string(),
ty::Int(_) | ty::Uint(_) => "42".into(),
ty::Float(_) => "3.14159".into(),
ty::Slice(_) => "[]".to_string(),
ty::Adt(def, _) if Some(def.did()) == self.infcx.tcx.get_diagnostic_item(sym::Vec) => {
"vec![]".to_string()
}
ty::Adt(_, _) if implements_default(ty) => "Default::default()".to_string(),
ty::Ref(_, ty, mutability) => {
if let (ty::Str, hir::Mutability::Not) = (ty.kind(), mutability) {
"\"\"".to_string()
} else {
let Some(ty) = self.ty_kind_suggestion(*ty) else {
return None;
};
format!("&{}{ty}", mutability.prefix_str())
}
}
ty::Array(ty, len) => format!(
"[{}; {}]",
self.ty_kind_suggestion(*ty)?,
len.eval_target_usize(self.infcx.tcx, ty::ParamEnv::reveal_all()),
),
ty::Tuple(tys) => format!(
"({})",
tys.iter()
.map(|ty| self.ty_kind_suggestion(ty))
.collect::<Option<Vec<String>>>()?
.join(", ")
),
_ => "value".to_string(),
})
}
fn suggest_assign_value(
&self,
err: &mut Diag<'_>,
@ -661,24 +710,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
let ty = moved_place.ty(self.body, self.infcx.tcx).ty;
debug!("ty: {:?}, kind: {:?}", ty, ty.kind());
let tcx = self.infcx.tcx;
let implements_default = |ty, param_env| {
let Some(default_trait) = tcx.get_diagnostic_item(sym::Default) else {
return false;
};
self.infcx
.type_implements_trait(default_trait, [ty], param_env)
.must_apply_modulo_regions()
};
let assign_value = match ty.kind() {
ty::Never | ty::Error(_) => return,
ty::Bool => "false",
ty::Float(_) => "0.0",
ty::Int(_) | ty::Uint(_) => "0",
ty::Adt(def, _) if Some(def.did()) == tcx.get_diagnostic_item(sym::Vec) => "vec![]",
ty::Adt(_, _) if implements_default(ty, self.param_env) => "Default::default()",
_ => "value",
let Some(assign_value) = self.ty_kind_suggestion(ty) else {
return;
};
err.span_suggestion_verbose(

48
compiler/rustc_hir_analysis/src/check/mod.rs
View File

@ -81,6 +81,7 @@ use rustc_errors::ErrorGuaranteed;
use rustc_errors::{pluralize, struct_span_code_err, Diag};
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::intravisit::Visitor;
use rustc_hir::Mutability;
use rustc_index::bit_set::BitSet;
use rustc_infer::infer::error_reporting::ObligationCauseExt as _;
use rustc_infer::infer::outlives::env::OutlivesEnvironment;
@ -467,7 +468,9 @@ fn fn_sig_suggestion<'tcx>(
)
}
pub fn ty_kind_suggestion<'tcx>(ty: Ty<'tcx>, tcx: TyCtxt<'tcx>) -> Option<&'static str> {
pub fn ty_kind_suggestion<'tcx>(ty: Ty<'tcx>, tcx: TyCtxt<'tcx>) -> Option<String> {
// Keep in sync with `rustc_borrowck/src/diagnostics/conflict_errors.rs:ty_kind_suggestion`.
// FIXME: deduplicate the above.
let implements_default = |ty| {
let Some(default_trait) = tcx.get_diagnostic_item(sym::Default) else {
return false;
@ -478,14 +481,39 @@ pub fn ty_kind_suggestion<'tcx>(ty: Ty<'tcx>, tcx: TyCtxt<'tcx>) -> Option<&'sta
.must_apply_modulo_regions()
};
Some(match ty.kind() {
ty::Bool => "true",
ty::Char => "'a'",
ty::Int(_) | ty::Uint(_) => "42",
ty::Float(_) => "3.14159",
ty::Error(_) | ty::Never => return None,
ty::Adt(def, _) if Some(def.did()) == tcx.get_diagnostic_item(sym::Vec) => "vec![]",
ty::Adt(_, _) if implements_default(ty) => "Default::default()",
_ => "value",
ty::Never | ty::Error(_) => return None,
ty::Bool => "false".to_string(),
ty::Char => "\'x\'".to_string(),
ty::Int(_) | ty::Uint(_) => "42".into(),
ty::Float(_) => "3.14159".into(),
ty::Slice(_) => "[]".to_string(),
ty::Adt(def, _) if Some(def.did()) == tcx.get_diagnostic_item(sym::Vec) => {
"vec![]".to_string()
}
ty::Adt(_, _) if implements_default(ty) => "Default::default()".to_string(),
ty::Ref(_, ty, mutability) => {
if let (ty::Str, Mutability::Not) = (ty.kind(), mutability) {
"\"\"".to_string()
} else {
let Some(ty) = ty_kind_suggestion(*ty, tcx) else {
return None;
};
format!("&{}{ty}", mutability.prefix_str())
}
}
ty::Array(ty, len) => format!(
"[{}; {}]",
ty_kind_suggestion(*ty, tcx)?,
len.eval_target_usize(tcx, ty::ParamEnv::reveal_all()),
),
ty::Tuple(tys) => format!(
"({})",
tys.iter()
.map(|ty| ty_kind_suggestion(ty, tcx))
.collect::<Option<Vec<String>>>()?
.join(", ")
),
_ => "value".to_string(),
})
}
@ -523,7 +551,7 @@ fn suggestion_signature<'tcx>(
}
ty::AssocKind::Const => {
let ty = tcx.type_of(assoc.def_id).instantiate_identity();
let val = ty_kind_suggestion(ty, tcx).unwrap_or("todo!()");
let val = ty_kind_suggestion(ty, tcx).unwrap_or_else(|| "value".to_string());
format!("const {}: {} = {};", assoc.name, ty, val)
}
}

8
tests/ui/asm/x86_64/type-check-5.stderr
View File

@ -8,8 +8,8 @@ LL | asm!("{}", in(reg) x);
|
help: consider assigning a value
|
LL | let x: u64 = 0;
| +++
LL | let x: u64 = 42;
| ++++
error[E0381]: used binding `y` isn't initialized
--> $DIR/type-check-5.rs:18:9
@ -21,8 +21,8 @@ LL | asm!("{}", inout(reg) y);
|
help: consider assigning a value
|
LL | let mut y: u64 = 0;
| +++
LL | let mut y: u64 = 42;
| ++++
error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable
--> $DIR/type-check-5.rs:24:13

4
tests/ui/binop/issue-77910-1.stderr
View File

@ -32,8 +32,8 @@ LL | xs
|
help: consider assigning a value
|
LL | let xs = value;
| +++++++
LL | let xs = &42;
| +++++
error: aborting due to 3 previous errors

4
tests/ui/binop/issue-77910-2.stderr
View File

@ -21,8 +21,8 @@ LL | xs
|
help: consider assigning a value
|
LL | let xs = value;
| +++++++
LL | let xs = &42;
| +++++
error: aborting due to 2 previous errors

4
tests/ui/borrowck/borrowck-block-uninit.stderr
View File

@ -10,8 +10,8 @@ LL | println!("{}", x);
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-break-uninit-2.stderr
View File

@ -10,8 +10,8 @@ LL | println!("{}", x);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-break-uninit.stderr
View File

@ -10,8 +10,8 @@ LL | println!("{}", x);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-init-in-called-fn-expr.stderr
View File

@ -8,8 +8,8 @@ LL | i
|
help: consider assigning a value
|
LL | let i: isize = 0;
| +++
LL | let i: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-init-in-fn-expr.stderr
View File

@ -8,8 +8,8 @@ LL | i
|
help: consider assigning a value
|
LL | let i: isize = 0;
| +++
LL | let i: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-init-op-equal.stderr
View File

@ -8,8 +8,8 @@ LL | v += 1;
|
help: consider assigning a value
|
LL | let v: isize = 0;
| +++
LL | let v: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-init-plus-equal.stderr
View File

@ -8,8 +8,8 @@ LL | v = v + 1;
|
help: consider assigning a value
|
LL | let mut v: isize = 0;
| +++
LL | let mut v: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-return.stderr
View File

@ -8,8 +8,8 @@ LL | return x;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-storage-dead.stderr
View File

@ -8,8 +8,8 @@ LL | let _ = x + 1;
|
help: consider assigning a value
|
LL | let x: i32 = 0;
| +++
LL | let x: i32 = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/borrowck/borrowck-uninit-after-item.stderr
View File

@ -9,8 +9,8 @@ LL | baz(bar);
|
help: consider assigning a value
|
LL | let bar = 0;
| +++
LL | let bar = 42;
| ++++
error: aborting due to 1 previous error

40
tests/ui/borrowck/borrowck-uninit-in-assignop.stderr
View File

@ -8,8 +8,8 @@ LL | x += 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:9:5
@ -21,8 +21,8 @@ LL | x -= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:12:5
@ -34,8 +34,8 @@ LL | x *= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:15:5
@ -47,8 +47,8 @@ LL | x /= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:18:5
@ -60,8 +60,8 @@ LL | x %= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:21:5
@ -73,8 +73,8 @@ LL | x ^= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:24:5
@ -86,8 +86,8 @@ LL | x &= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:27:5
@ -99,8 +99,8 @@ LL | x |= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:30:5
@ -112,8 +112,8 @@ LL | x <<= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-in-assignop.rs:33:5
@ -125,8 +125,8 @@ LL | x >>= 1;
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error: aborting due to 10 previous errors

12
tests/ui/borrowck/borrowck-uninit-ref-chain.stderr
View File

@ -8,8 +8,8 @@ LL | let _y = &**x;
|
help: consider assigning a value
|
LL | let x: &&Box<i32> = value;
| +++++++
LL | let x: &&Box<i32> = &&Default::default();
| ++++++++++++++++++++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-ref-chain.rs:11:14
@ -21,8 +21,8 @@ LL | let _y = &**x;
|
help: consider assigning a value
|
LL | let x: &&S<i32, i32> = value;
| +++++++
LL | let x: &&S<i32, i32> = &&value;
| +++++++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-uninit-ref-chain.rs:14:14
@ -34,8 +34,8 @@ LL | let _y = &**x;
|
help: consider assigning a value
|
LL | let x: &&i32 = value;
| +++++++
LL | let x: &&i32 = &&42;
| ++++++
error[E0381]: partially assigned binding `a` isn't fully initialized
--> $DIR/borrowck-uninit-ref-chain.rs:18:5

4
tests/ui/borrowck/borrowck-uninit.stderr
View File

@ -8,8 +8,8 @@ LL | foo(x);
|
help: consider assigning a value
|
LL | let x: isize = 0;
| +++
LL | let x: isize = 42;
| ++++
error[E0381]: used binding `a` isn't initialized
--> $DIR/borrowck-uninit.rs:14:32

11
tests/ui/borrowck/borrowck-use-in-index-lvalue.fixed Normal file
View File

@ -0,0 +1,11 @@
//@ run-rustfix
#[allow(unused_mut)]
fn test() {
let w: &mut [isize] = &mut [];
w[5] = 0; //~ ERROR [E0381]
let mut w: &mut [isize] = &mut [];
w[5] = 0; //~ ERROR [E0381]
}
fn main() { test(); }

2
tests/ui/borrowck/borrowck-use-in-index-lvalue.rs
View File

@ -1,3 +1,5 @@
//@ run-rustfix
#[allow(unused_mut)]
fn test() {
let w: &mut [isize];
w[5] = 0; //~ ERROR [E0381]

12
tests/ui/borrowck/borrowck-use-in-index-lvalue.stderr
View File

@ -1,5 +1,5 @@
error[E0381]: used binding `w` isn't initialized
--> $DIR/borrowck-use-in-index-lvalue.rs:3:5
--> $DIR/borrowck-use-in-index-lvalue.rs:5:5
|
LL | let w: &mut [isize];
| - binding declared here but left uninitialized
@ -8,11 +8,11 @@ LL | w[5] = 0;
|
help: consider assigning a value
|
LL | let w: &mut [isize] = value;
| +++++++
LL | let w: &mut [isize] = &mut [];
| +++++++++
error[E0381]: used binding `w` isn't initialized
--> $DIR/borrowck-use-in-index-lvalue.rs:6:5
--> $DIR/borrowck-use-in-index-lvalue.rs:8:5
|
LL | let mut w: &mut [isize];
| ----- binding declared here but left uninitialized
@ -21,8 +21,8 @@ LL | w[5] = 0;
|
help: consider assigning a value
|
LL | let mut w: &mut [isize] = value;
| +++++++
LL | let mut w: &mut [isize] = &mut [];
| +++++++++
error: aborting due to 2 previous errors

12
tests/ui/borrowck/borrowck-use-uninitialized-in-cast-trait.fixed Normal file
View File

@ -0,0 +1,12 @@
// Variation on `borrowck-use-uninitialized-in-cast` in which we do a
// trait cast from an uninitialized source. Issue #20791.
//@ run-rustfix
#![allow(unused_variables, dead_code)]
trait Foo { fn dummy(&self) { } }
impl Foo for i32 { }
fn main() {
let x: &i32 = &42;
let y = x as *const dyn Foo; //~ ERROR [E0381]
}

2
tests/ui/borrowck/borrowck-use-uninitialized-in-cast-trait.rs
View File

@ -1,5 +1,7 @@
// Variation on `borrowck-use-uninitialized-in-cast` in which we do a
// trait cast from an uninitialized source. Issue #20791.
//@ run-rustfix
#![allow(unused_variables, dead_code)]
trait Foo { fn dummy(&self) { } }
impl Foo for i32 { }

6
tests/ui/borrowck/borrowck-use-uninitialized-in-cast-trait.stderr
View File

@ -1,5 +1,5 @@
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-use-uninitialized-in-cast-trait.rs:9:13
--> $DIR/borrowck-use-uninitialized-in-cast-trait.rs:11:13
|
LL | let x: &i32;
| - binding declared here but left uninitialized
@ -8,8 +8,8 @@ LL | let y = x as *const dyn Foo;
|
help: consider assigning a value
|
LL | let x: &i32 = value;
| +++++++
LL | let x: &i32 = &42;
| +++++
error: aborting due to 1 previous error

10
tests/ui/borrowck/borrowck-use-uninitialized-in-cast.fixed Normal file
View File

@ -0,0 +1,10 @@
// Check that we detect unused values that are cast to other things.
// The problem was specified to casting to `*`, as creating unsafe
// pointers was not being fully checked. Issue #20791.
//@ run-rustfix
#![allow(unused_variables)]
fn main() {
let x: &i32 = &42;
let y = x as *const i32; //~ ERROR [E0381]
}

2
tests/ui/borrowck/borrowck-use-uninitialized-in-cast.rs
View File

@ -1,6 +1,8 @@
// Check that we detect unused values that are cast to other things.
// The problem was specified to casting to `*`, as creating unsafe
// pointers was not being fully checked. Issue #20791.
//@ run-rustfix
#![allow(unused_variables)]
fn main() {
let x: &i32;

6
tests/ui/borrowck/borrowck-use-uninitialized-in-cast.stderr
View File

@ -1,5 +1,5 @@
error[E0381]: used binding `x` isn't initialized
--> $DIR/borrowck-use-uninitialized-in-cast.rs:7:13
--> $DIR/borrowck-use-uninitialized-in-cast.rs:9:13
|
LL | let x: &i32;
| - binding declared here but left uninitialized
@ -8,8 +8,8 @@ LL | let y = x as *const i32;
|
help: consider assigning a value
|
LL | let x: &i32 = value;
| +++++++
LL | let x: &i32 = &42;
| +++++
error: aborting due to 1 previous error

8
tests/ui/borrowck/issue-24267-flow-exit.stderr
View File

@ -10,8 +10,8 @@ LL | println!("{}", x);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let x: i32 = 0;
| +++
LL | let x: i32 = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/issue-24267-flow-exit.rs:18:20
@ -25,8 +25,8 @@ LL | println!("{}", x);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let x: i32 = 0;
| +++
LL | let x: i32 = 42;
| ++++
error: aborting due to 2 previous errors

4
tests/ui/borrowck/issue-62107-match-arm-scopes.stderr
View File

@ -9,8 +9,8 @@ LL | ref u if true => {}
|
help: consider assigning a value
|
LL | let e: i32 = 0;
| +++
LL | let e: i32 = 42;
| ++++
error: aborting due to 1 previous error

20
tests/ui/borrowck/suggest-assign-rvalue.stderr
View File

@ -8,8 +8,8 @@ LL | apple(chaenomeles);
|
help: consider assigning a value
|
LL | let chaenomeles = 0;
| +++
LL | let chaenomeles = 42;
| ++++
error[E0381]: used binding `my_float` isn't initialized
--> $DIR/suggest-assign-rvalue.rs:23:30
@ -22,8 +22,8 @@ LL | println!("my_float: {}", my_float);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let my_float: f32 = 0.0;
| +++++
LL | let my_float: f32 = 3.14159;
| +++++++++
error[E0381]: used binding `demo` isn't initialized
--> $DIR/suggest-assign-rvalue.rs:26:28
@ -64,8 +64,8 @@ LL | println!("arr: {:?}", arr);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let arr: [i32; 5] = value;
| +++++++
LL | let arr: [i32; 5] = [42; 5];
| +++++++++
error[E0381]: used binding `foo` isn't initialized
--> $DIR/suggest-assign-rvalue.rs:37:27
@ -106,8 +106,8 @@ LL | println!("my_int: {}", *my_int);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let my_int: &i32 = value;
| +++++++
LL | let my_int: &i32 = &42;
| +++++
error[E0381]: used binding `hello` isn't initialized
--> $DIR/suggest-assign-rvalue.rs:49:27
@ -120,8 +120,8 @@ LL | println!("hello: {}", hello);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let hello: &str = value;
| +++++++
LL | let hello: &str = "";
| ++++
error[E0381]: used binding `never` isn't initialized
--> $DIR/suggest-assign-rvalue.rs:53:27

4
tests/ui/closures/2229_closure_analysis/match/pattern-matching-should-fail.stderr
View File

@ -79,8 +79,8 @@ LL | let c1 = || match x { };
|
help: consider assigning a value
|
LL | let x: u8 = 0;
| +++
LL | let x: u8 = 42;
| ++++
error: aborting due to 8 previous errors

6
tests/ui/const-generics/const-generic-default-wont-borrowck.fixed Normal file
View File

@ -0,0 +1,6 @@
//@ run-rustfix
pub struct X<const N: usize = {
let s: &'static str = ""; s.len() //~ ERROR E0381
}>;
fn main() {}

3
tests/ui/const-generics/const-generic-default-wont-borrowck.rs
View File

@ -1,4 +1,5 @@
struct X<const N: usize = {
//@ run-rustfix
pub struct X<const N: usize = {
let s: &'static str; s.len() //~ ERROR E0381
}>;

6
tests/ui/const-generics/const-generic-default-wont-borrowck.stderr
View File

@ -1,5 +1,5 @@
error[E0381]: used binding `s` isn't initialized
--> $DIR/const-generic-default-wont-borrowck.rs:2:26
--> $DIR/const-generic-default-wont-borrowck.rs:3:26
|
LL | let s: &'static str; s.len()
| - ^ `*s` used here but it isn't initialized
@ -8,8 +8,8 @@ LL | let s: &'static str; s.len()
|
help: consider assigning a value
|
LL | let s: &'static str = value; s.len()
| +++++++
LL | let s: &'static str = ""; s.len()
| ++++
error: aborting due to 1 previous error

4
tests/ui/consts/issue-78655.stderr
View File

@ -8,8 +8,8 @@ LL | &x
|
help: consider assigning a value
|
LL | let x = 0;
| +++
LL | let x = 42;
| ++++
error: could not evaluate constant pattern
--> $DIR/issue-78655.rs:7:9

4
tests/ui/drop/repeat-drop-2.stderr
View File

@ -32,8 +32,8 @@ LL | let _ = [x; 0];
|
help: consider assigning a value
|
LL | let x: u8 = 0;
| +++
LL | let x: u8 = 42;
| ++++
error: aborting due to 3 previous errors

4
tests/ui/loops/loop-proper-liveness.stderr
View File

@ -10,8 +10,8 @@ LL | println!("{:?}", x);
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider assigning a value
|
LL | let x: i32 = 0;
| +++
LL | let x: i32 = 42;
| ++++
error: aborting due to 1 previous error

4
tests/ui/moves/move-into-dead-array-1.stderr
View File

@ -8,8 +8,8 @@ LL | a[i] = d();
|
help: consider assigning a value
|
LL | let mut a: [D; 4] = value;
| +++++++
LL | let mut a: [D; 4] = [value; 4];
| ++++++++++++
error: aborting due to 1 previous error

8
tests/ui/nll/match-cfg-fake-edges.stderr
View File

@ -126,8 +126,8 @@ LL | _ if { x; false } => 2,
|
help: consider assigning a value
|
LL | let x = 0;
| +++
LL | let x = 42;
| ++++
error[E0381]: used binding `x` isn't initialized
--> $DIR/match-cfg-fake-edges.rs:86:31
@ -142,8 +142,8 @@ LL | _ if let Some(()) = { x; None } => 2,
|
help: consider assigning a value
|
LL | let x = 0;
| +++
LL | let x = 42;
| ++++
error[E0382]: use of moved value: `x`
--> $DIR/match-cfg-fake-edges.rs:99:22

31
tests/ui/uninhabited/privately-uninhabited-mir-call.fixed Normal file
View File

@ -0,0 +1,31 @@
// Verifies that MIR building for a call expression respects
// privacy when checking if a call return type is uninhabited.
//@ run-rustfix
#![allow(unreachable_code, unused_variables)]
pub mod widget {
enum Unimplemented {}
pub struct Widget(Unimplemented);
impl Widget {
pub fn new() -> Widget {
todo!();
}
}
pub fn f() {
let x: &mut u32;
Widget::new();
// Ok. Widget type returned from new is known to be uninhabited
// and the following code is considered unreachable.
*x = 1;
}
}
fn main() {
let y: &mut u32 = &mut 42;
widget::Widget::new();
// Error. Widget type is not known to be uninhabited here,
// so the following code is considered reachable.
*y = 2; //~ ERROR E0381
}

2
tests/ui/uninhabited/privately-uninhabited-mir-call.rs
View File

@ -1,5 +1,7 @@
// Verifies that MIR building for a call expression respects
// privacy when checking if a call return type is uninhabited.
//@ run-rustfix
#![allow(unreachable_code, unused_variables)]
pub mod widget {
enum Unimplemented {}

6
tests/ui/uninhabited/privately-uninhabited-mir-call.stderr
View File

@ -1,5 +1,5 @@
error[E0381]: used binding `y` isn't initialized
--> $DIR/privately-uninhabited-mir-call.rs:28:5
--> $DIR/privately-uninhabited-mir-call.rs:30:5
|
LL | let y: &mut u32;
| - binding declared here but left uninitialized
@ -9,8 +9,8 @@ LL | *y = 2;
|
help: consider assigning a value
|
LL | let y: &mut u32 = value;
| +++++++
LL | let y: &mut u32 = &mut 42;
| +++++++++
error: aborting due to 1 previous error