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Note the type when unable to drop values in compile time
1 parent 4d44e09 commit 2ce1cd5

37 files changed

+158
-150
lines changed

‎compiler/rustc_const_eval/src/transform/check_consts/check.rs

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1009,7 +1009,10 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
10091009

10101010
if needs_non_const_drop {
10111011
self.check_op_spanned(
1012-
ops::LiveDrop { dropped_at: Some(terminator.source_info.span) },
1012+
ops::LiveDrop {
1013+
dropped_at: Some(terminator.source_info.span),
1014+
dropped_ty: ty_of_dropped_place,
1015+
},
10131016
err_span,
10141017
);
10151018
}

‎compiler/rustc_const_eval/src/transform/check_consts/ops.rs

Lines changed: 9 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -422,10 +422,11 @@ impl<'tcx> NonConstOp<'tcx> for InlineAsm {
422422
}
423423

424424
#[derive(Debug)]
425-
pub struct LiveDrop {
425+
pub struct LiveDrop<'tcx> {
426426
pub dropped_at: Option<Span>,
427+
pub dropped_ty: Ty<'tcx>,
427428
}
428-
impl<'tcx> NonConstOp<'tcx> for LiveDrop {
429+
impl<'tcx> NonConstOp<'tcx> for LiveDrop<'tcx> {
429430
fn build_error(
430431
&self,
431432
ccx: &ConstCx<'_, 'tcx>,
@@ -435,9 +436,13 @@ impl<'tcx> NonConstOp<'tcx> for LiveDrop {
435436
ccx.tcx.sess,
436437
span,
437438
E0493,
438-
"destructors cannot be evaluated at compile-time"
439+
"destructor of `{}` cannot be evaluated at compile-time",
440+
self.dropped_ty,
441+
);
442+
err.span_label(
443+
span,
444+
format!("the destructor for this type cannot be evaluated in {}s", ccx.const_kind()),
439445
);
440-
err.span_label(span, format!("{}s cannot evaluate destructors", ccx.const_kind()));
441446
if let Some(span) = self.dropped_at {
442447
err.span_label(span, "value is dropped here");
443448
}

‎compiler/rustc_const_eval/src/transform/check_consts/post_drop_elaboration.rs

Lines changed: 6 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
11
use rustc_middle::mir::visit::Visitor;
22
use rustc_middle::mir::{self, BasicBlock, Location};
3-
use rustc_middle::ty::TyCtxt;
3+
use rustc_middle::ty::{Ty, TyCtxt};
44
use rustc_span::{symbol::sym, Span};
55

66
use super::check::Qualifs;
@@ -58,9 +58,9 @@ impl<'mir, 'tcx> std::ops::Deref for CheckLiveDrops<'mir, 'tcx> {
5858
}
5959
}
6060

61-
impl CheckLiveDrops<'_, '_> {
62-
fn check_live_drop(&self, span: Span) {
63-
ops::LiveDrop { dropped_at: None }.build_error(self.ccx, span).emit();
61+
impl<'tcx> CheckLiveDrops<'_, 'tcx> {
62+
fn check_live_drop(&self, span: Span, dropped_ty: Ty<'tcx>) {
63+
ops::LiveDrop { dropped_at: None, dropped_ty }.build_error(self.ccx, span).emit();
6464
}
6565
}
6666

@@ -90,7 +90,7 @@ impl<'tcx> Visitor<'tcx> for CheckLiveDrops<'_, 'tcx> {
9090
}
9191

9292
if dropped_place.is_indirect() {
93-
self.check_live_drop(terminator.source_info.span);
93+
self.check_live_drop(terminator.source_info.span, dropped_ty);
9494
return;
9595
}
9696

@@ -101,7 +101,7 @@ impl<'tcx> Visitor<'tcx> for CheckLiveDrops<'_, 'tcx> {
101101
if self.qualifs.needs_non_const_drop(self.ccx, dropped_place.local, location) {
102102
// Use the span where the dropped local was declared for the error.
103103
let span = self.body.local_decls[dropped_place.local].source_info.span;
104-
self.check_live_drop(span);
104+
self.check_live_drop(span, dropped_ty);
105105
}
106106
}
107107

‎src/test/ui/check-static-values-constraints.rs

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -63,7 +63,7 @@ static STATIC8: SafeStruct = SafeStruct{field1: SafeEnum::Variant1,
6363
// This example should fail because field1 in the base struct is not safe
6464
static STATIC9: SafeStruct = SafeStruct{field1: SafeEnum::Variant1,
6565
..SafeStruct{field1: SafeEnum::Variant3(WithDtor),
66-
//~^ ERROR destructors cannot be evaluated at compile-time
66+
//~^ ERROR destructor of
6767
field2: SafeEnum::Variant1}};
6868

6969
struct UnsafeStruct;

‎src/test/ui/check-static-values-constraints.stderr

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
error[E0493]: destructors cannot be evaluated at compile-time
1+
error[E0493]: destructor of `SafeStruct` cannot be evaluated at compile-time
22
--> $DIR/check-static-values-constraints.rs:65:43
33
|
44
LL | ..SafeStruct{field1: SafeEnum::Variant3(WithDtor),
@@ -7,7 +7,7 @@ LL | |
77
LL | | field2: SafeEnum::Variant1}};
88
| | ^- value is dropped here
99
| |________________________________________________________________________________|
10-
| statics cannot evaluate destructors
10+
| the destructor for this type cannot be evaluated in statics
1111

1212
error[E0010]: allocations are not allowed in statics
1313
--> $DIR/check-static-values-constraints.rs:79:33

‎src/test/ui/consts/const-eval/const_let.rs

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -14,16 +14,16 @@ const X2: FakeNeedsDrop = { let x; x = FakeNeedsDrop; x };
1414

1515
// error
1616
const Y: FakeNeedsDrop = { let mut x = FakeNeedsDrop; x = FakeNeedsDrop; x };
17-
//~^ ERROR destructors cannot be evaluated at compile-time
17+
//~^ ERROR destructor of
1818

1919
// error
2020
const Y2: FakeNeedsDrop = { let mut x; x = FakeNeedsDrop; x = FakeNeedsDrop; x };
21-
//~^ ERROR destructors cannot be evaluated at compile-time
21+
//~^ ERROR destructor of
2222

2323
// error
2424
const Z: () = { let mut x = None; x = Some(FakeNeedsDrop); };
25-
//~^ ERROR destructors cannot be evaluated at compile-time
25+
//~^ ERROR destructor of
2626

2727
// error
2828
const Z2: () = { let mut x; x = None; x = Some(FakeNeedsDrop); };
29-
//~^ ERROR destructors cannot be evaluated at compile-time
29+
//~^ ERROR destructor of

‎src/test/ui/consts/const-eval/const_let.stderr

Lines changed: 8 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,34 +1,34 @@
1-
error[E0493]: destructors cannot be evaluated at compile-time
1+
error[E0493]: destructor of `FakeNeedsDrop` cannot be evaluated at compile-time
22
--> $DIR/const_let.rs:16:32
33
|
44
LL | const Y: FakeNeedsDrop = { let mut x = FakeNeedsDrop; x = FakeNeedsDrop; x };
55
| ^^^^^ - value is dropped here
66
| |
7-
| constants cannot evaluate destructors
7+
| the destructor for this type cannot be evaluated in constants
88

9-
error[E0493]: destructors cannot be evaluated at compile-time
9+
error[E0493]: destructor of `FakeNeedsDrop` cannot be evaluated at compile-time
1010
--> $DIR/const_let.rs:20:33
1111
|
1212
LL | const Y2: FakeNeedsDrop = { let mut x; x = FakeNeedsDrop; x = FakeNeedsDrop; x };
1313
| ^^^^^ - value is dropped here
1414
| |
15-
| constants cannot evaluate destructors
15+
| the destructor for this type cannot be evaluated in constants
1616

17-
error[E0493]: destructors cannot be evaluated at compile-time
17+
error[E0493]: destructor of `Option<FakeNeedsDrop>` cannot be evaluated at compile-time
1818
--> $DIR/const_let.rs:24:21
1919
|
2020
LL | const Z: () = { let mut x = None; x = Some(FakeNeedsDrop); };
2121
| ^^^^^ - value is dropped here
2222
| |
23-
| constants cannot evaluate destructors
23+
| the destructor for this type cannot be evaluated in constants
2424

25-
error[E0493]: destructors cannot be evaluated at compile-time
25+
error[E0493]: destructor of `Option<FakeNeedsDrop>` cannot be evaluated at compile-time
2626
--> $DIR/const_let.rs:28:22
2727
|
2828
LL | const Z2: () = { let mut x; x = None; x = Some(FakeNeedsDrop); };
2929
| ^^^^^ - value is dropped here
3030
| |
31-
| constants cannot evaluate destructors
31+
| the destructor for this type cannot be evaluated in constants
3232

3333
error: aborting due to 4 previous errors
3434

‎src/test/ui/consts/const-eval/issue-65394.rs

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
44
// We will likely have to change this behavior before we allow `&mut` in a `const`.
55

66
const _: Vec<i32> = {
7-
let mut x = Vec::<i32>::new(); //~ ERROR destructors cannot be evaluated at compile-time
7+
let mut x = Vec::<i32>::new(); //~ ERROR destructor of
88
let r = &mut x; //~ ERROR mutable references are not allowed in constants
99
let y = x;
1010
y

‎src/test/ui/consts/const-eval/issue-65394.stderr

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,11 +7,11 @@ LL | let r = &mut x;
77
= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
88
= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
99

10-
error[E0493]: destructors cannot be evaluated at compile-time
10+
error[E0493]: destructor of `Vec<i32>` cannot be evaluated at compile-time
1111
--> $DIR/issue-65394.rs:7:9
1212
|
1313
LL | let mut x = Vec::<i32>::new();
14-
| ^^^^^ constants cannot evaluate destructors
14+
| ^^^^^ the destructor for this type cannot be evaluated in constants
1515
...
1616
LL | };
1717
| - value is dropped here

‎src/test/ui/consts/const-eval/livedrop.rs

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
11
const _: Option<Vec<i32>> = {
22
let mut never_returned = Some(Vec::new());
3-
let mut always_returned = None; //~ ERROR destructors cannot be evaluated at compile-time
3+
let mut always_returned = None; //~ ERROR destructor of
44

55
let mut i = 0;
66
loop {

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