#![allow(rustc::diagnostic_outside_of_impl)]
#![allow(rustc::untranslatable_diagnostic)]
use rustc_errors::codes::*;
use rustc_errors::{struct_span_code_err, Applicability, Diag, DiagCtxtHandle};
use rustc_hir as hir;
use rustc_middle::span_bug;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::Span;
impl<'infcx, 'tcx> crate::MirBorrowckCtxt<'_, '_, 'infcx, 'tcx> {
pub(crate) fn dcx(&self) -> DiagCtxtHandle<'infcx> {
self.infcx.dcx()
}
pub(crate) fn cannot_move_when_borrowed(
&self,
span: Span,
borrow_span: Span,
place: &str,
borrow_place: &str,
value_place: &str,
) -> Diag<'infcx> {
self.dcx().create_err(crate::session_diagnostics::MoveBorrow {
place,
span,
borrow_place,
value_place,
borrow_span,
})
}
pub(crate) fn cannot_use_when_mutably_borrowed(
&self,
span: Span,
desc: &str,
borrow_span: Span,
borrow_desc: &str,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
span,
E0503,
"cannot use {} because it was mutably borrowed",
desc,
)
.with_span_label(borrow_span, format!("{borrow_desc} is borrowed here"))
.with_span_label(span, format!("use of borrowed {borrow_desc}"))
}
pub(crate) fn cannot_mutably_borrow_multiply(
&self,
new_loan_span: Span,
desc: &str,
opt_via: &str,
old_loan_span: Span,
old_opt_via: &str,
old_load_end_span: Option<Span>,
) -> Diag<'infcx> {
let via = |msg: &str| if msg.is_empty() { "".to_string() } else { format!(" (via {msg})") };
let mut err = struct_span_code_err!(
self.dcx(),
new_loan_span,
E0499,
"cannot borrow {}{} as mutable more than once at a time",
desc,
via(opt_via),
);
if old_loan_span == new_loan_span {
err.span_label(
new_loan_span,
format!(
"{}{} was mutably borrowed here in the previous iteration of the loop{}",
desc,
via(opt_via),
opt_via,
),
);
if let Some(old_load_end_span) = old_load_end_span {
err.span_label(old_load_end_span, "mutable borrow ends here");
}
} else {
err.span_label(
old_loan_span,
format!("first mutable borrow occurs here{}", via(old_opt_via)),
);
err.span_label(
new_loan_span,
format!("second mutable borrow occurs here{}", via(opt_via)),
);
if let Some(old_load_end_span) = old_load_end_span {
err.span_label(old_load_end_span, "first borrow ends here");
}
}
err
}
pub(crate) fn cannot_uniquely_borrow_by_two_closures(
&self,
new_loan_span: Span,
desc: &str,
old_loan_span: Span,
old_load_end_span: Option<Span>,
) -> Diag<'infcx> {
let mut err = struct_span_code_err!(
self.dcx(),
new_loan_span,
E0524,
"two closures require unique access to {} at the same time",
desc,
);
if old_loan_span == new_loan_span {
err.span_label(
old_loan_span,
"closures are constructed here in different iterations of loop",
);
} else {
err.span_label(old_loan_span, "first closure is constructed here");
err.span_label(new_loan_span, "second closure is constructed here");
}
if let Some(old_load_end_span) = old_load_end_span {
err.span_label(old_load_end_span, "borrow from first closure ends here");
}
err
}
pub(crate) fn cannot_uniquely_borrow_by_one_closure(
&self,
new_loan_span: Span,
container_name: &str,
desc_new: &str,
opt_via: &str,
old_loan_span: Span,
noun_old: &str,
old_opt_via: &str,
previous_end_span: Option<Span>,
) -> Diag<'infcx> {
let mut err = struct_span_code_err!(
self.dcx(),
new_loan_span,
E0500,
"closure requires unique access to {} but {} is already borrowed{}",
desc_new,
noun_old,
old_opt_via,
);
err.span_label(
new_loan_span,
format!("{container_name} construction occurs here{opt_via}"),
);
err.span_label(old_loan_span, format!("borrow occurs here{old_opt_via}"));
if let Some(previous_end_span) = previous_end_span {
err.span_label(previous_end_span, "borrow ends here");
}
err
}
pub(crate) fn cannot_reborrow_already_uniquely_borrowed(
&self,
new_loan_span: Span,
container_name: &str,
desc_new: &str,
opt_via: &str,
kind_new: &str,
old_loan_span: Span,
old_opt_via: &str,
previous_end_span: Option<Span>,
second_borrow_desc: &str,
) -> Diag<'infcx> {
let mut err = struct_span_code_err!(
self.dcx(),
new_loan_span,
E0501,
"cannot borrow {}{} as {} because previous closure requires unique access",
desc_new,
opt_via,
kind_new,
);
err.span_label(new_loan_span, format!("{second_borrow_desc}borrow occurs here{opt_via}"));
err.span_label(
old_loan_span,
format!("{container_name} construction occurs here{old_opt_via}"),
);
if let Some(previous_end_span) = previous_end_span {
err.span_label(previous_end_span, "borrow from closure ends here");
}
err
}
pub(crate) fn cannot_reborrow_already_borrowed(
&self,
span: Span,
desc_new: &str,
msg_new: &str,
kind_new: &str,
old_span: Span,
noun_old: &str,
kind_old: &str,
msg_old: &str,
old_load_end_span: Option<Span>,
) -> Diag<'infcx> {
let via = |msg: &str| if msg.is_empty() { "".to_string() } else { format!(" (via {msg})") };
let mut err = struct_span_code_err!(
self.dcx(),
span,
E0502,
"cannot borrow {}{} as {} because {} is also borrowed as {}{}",
desc_new,
via(msg_new),
kind_new,
noun_old,
kind_old,
via(msg_old),
);
if msg_new.is_empty() {
err.span_label(span, format!("{kind_new} borrow occurs here"));
err.span_label(old_span, format!("{kind_old} borrow occurs here"));
} else {
err.span_label(
span,
format!(
"{kind_new} borrow of {msg_new} -- which overlaps with {msg_old} -- occurs here",
),
);
err.span_label(old_span, format!("{} borrow occurs here{}", kind_old, via(msg_old)));
}
if let Some(old_load_end_span) = old_load_end_span {
err.span_label(old_load_end_span, format!("{kind_old} borrow ends here"));
}
err
}
pub(crate) fn cannot_assign_to_borrowed(
&self,
span: Span,
borrow_span: Span,
desc: &str,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
span,
E0506,
"cannot assign to {} because it is borrowed",
desc,
)
.with_span_label(borrow_span, format!("{desc} is borrowed here"))
.with_span_label(span, format!("{desc} is assigned to here but it was already borrowed"))
}
pub(crate) fn cannot_reassign_immutable(
&self,
span: Span,
desc: &str,
is_arg: bool,
) -> Diag<'infcx> {
let msg = if is_arg { "to immutable argument" } else { "twice to immutable variable" };
struct_span_code_err!(self.dcx(), span, E0384, "cannot assign {} {}", msg, desc)
}
pub(crate) fn cannot_assign(&self, span: Span, desc: &str) -> Diag<'infcx> {
struct_span_code_err!(self.dcx(), span, E0594, "cannot assign to {}", desc)
}
pub(crate) fn cannot_move_out_of(
&self,
move_from_span: Span,
move_from_desc: &str,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
move_from_span,
E0507,
"cannot move out of {}",
move_from_desc
)
}
pub(crate) fn cannot_move_out_of_interior_noncopy(
&self,
move_from_span: Span,
ty: Ty<'_>,
is_index: Option<bool>,
) -> Diag<'infcx> {
let type_name = match (ty.kind(), is_index) {
(&ty::Array(_, _), Some(true)) | (&ty::Array(_, _), None) => "array",
(&ty::Slice(_), _) => "slice",
_ => span_bug!(move_from_span, "this path should not cause illegal move"),
};
struct_span_code_err!(
self.dcx(),
move_from_span,
E0508,
"cannot move out of type `{}`, a non-copy {}",
ty,
type_name,
)
.with_span_label(move_from_span, "cannot move out of here")
}
pub(crate) fn cannot_move_out_of_interior_of_drop(
&self,
move_from_span: Span,
container_ty: Ty<'_>,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
move_from_span,
E0509,
"cannot move out of type `{}`, which implements the `Drop` trait",
container_ty,
)
.with_span_label(move_from_span, "cannot move out of here")
}
pub(crate) fn cannot_act_on_moved_value(
&self,
use_span: Span,
verb: &str,
optional_adverb_for_moved: &str,
moved_path: Option<String>,
) -> Diag<'infcx> {
let moved_path = moved_path.map(|mp| format!(": `{mp}`")).unwrap_or_default();
struct_span_code_err!(
self.dcx(),
use_span,
E0382,
"{} of {}moved value{}",
verb,
optional_adverb_for_moved,
moved_path,
)
}
pub(crate) fn cannot_borrow_path_as_mutable_because(
&self,
span: Span,
path: &str,
reason: &str,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
span,
E0596,
"cannot borrow {} as mutable{}",
path,
reason
)
}
pub(crate) fn cannot_mutate_in_immutable_section(
&self,
mutate_span: Span,
immutable_span: Span,
immutable_place: &str,
immutable_section: &str,
action: &str,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
mutate_span,
E0510,
"cannot {} {} in {}",
action,
immutable_place,
immutable_section,
)
.with_span_label(mutate_span, format!("cannot {action}"))
.with_span_label(immutable_span, format!("value is immutable in {immutable_section}"))
}
pub(crate) fn cannot_borrow_across_coroutine_yield(
&self,
span: Span,
yield_span: Span,
) -> Diag<'infcx> {
let coroutine_kind = self.body.coroutine.as_ref().unwrap().coroutine_kind;
let mut diag = struct_span_code_err!(
self.dcx(),
span,
E0626,
"borrow may still be in use when {coroutine_kind:#} yields",
);
diag.span_label(
self.infcx.tcx.def_span(self.body.source.def_id()),
format!("within this {coroutine_kind:#}"),
);
diag.span_label(yield_span, "possible yield occurs here");
if matches!(coroutine_kind, hir::CoroutineKind::Coroutine(_)) {
let hir::Closure { capture_clause, fn_decl_span, .. } = self
.infcx
.tcx
.hir_node_by_def_id(self.body.source.def_id().expect_local())
.expect_closure();
let span = match capture_clause {
rustc_hir::CaptureBy::Value { move_kw } => move_kw.shrink_to_lo(),
rustc_hir::CaptureBy::Ref => fn_decl_span.shrink_to_lo(),
};
diag.span_suggestion_verbose(
span,
"add `static` to mark this coroutine as unmovable",
"static ",
Applicability::MaybeIncorrect,
);
}
diag
}
pub(crate) fn cannot_borrow_across_destructor(&self, borrow_span: Span) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
borrow_span,
E0713,
"borrow may still be in use when destructor runs",
)
}
pub(crate) fn path_does_not_live_long_enough(&self, span: Span, path: &str) -> Diag<'infcx> {
struct_span_code_err!(self.dcx(), span, E0597, "{} does not live long enough", path,)
}
pub(crate) fn cannot_return_reference_to_local(
&self,
span: Span,
return_kind: &str,
reference_desc: &str,
path_desc: &str,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
span,
E0515,
"cannot {RETURN} {REFERENCE} {LOCAL}",
RETURN = return_kind,
REFERENCE = reference_desc,
LOCAL = path_desc,
)
.with_span_label(
span,
format!("{return_kind}s a {reference_desc} data owned by the current function"),
)
}
pub(crate) fn cannot_capture_in_long_lived_closure(
&self,
closure_span: Span,
closure_kind: &str,
borrowed_path: &str,
capture_span: Span,
scope: &str,
) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
closure_span,
E0373,
"{closure_kind} may outlive the current {scope}, but it borrows {borrowed_path}, \
which is owned by the current {scope}",
)
.with_span_label(capture_span, format!("{borrowed_path} is borrowed here"))
.with_span_label(closure_span, format!("may outlive borrowed value {borrowed_path}"))
}
pub(crate) fn thread_local_value_does_not_live_long_enough(&self, span: Span) -> Diag<'infcx> {
struct_span_code_err!(
self.dcx(),
span,
E0712,
"thread-local variable borrowed past end of function",
)
}
pub(crate) fn temporary_value_borrowed_for_too_long(&self, span: Span) -> Diag<'infcx> {
struct_span_code_err!(self.dcx(), span, E0716, "temporary value dropped while borrowed",)
}
}
pub(crate) fn borrowed_data_escapes_closure<'tcx>(
tcx: TyCtxt<'tcx>,
escape_span: Span,
escapes_from: &str,
) -> Diag<'tcx> {
struct_span_code_err!(
tcx.dcx(),
escape_span,
E0521,
"borrowed data escapes outside of {}",
escapes_from,
)
}