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Add help message for mutation though overloaded place operators
This commit is contained in:
Matthew Jasper
parent
5b86c604f9
commit
38306adf16
@ -653,6 +653,26 @@ impl BorrowedContentSource<'tcx> {
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}
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}
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pub(super) fn describe_for_immutable_place(&self) -> String {
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match *self {
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BorrowedContentSource::DerefRawPointer => format!("a `*const` pointer"),
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BorrowedContentSource::DerefSharedRef => format!("a `&` reference"),
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BorrowedContentSource::DerefMutableRef => {
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bug!("describe_for_immutable_place: DerefMutableRef isn't immutable")
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},
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BorrowedContentSource::OverloadedDeref(ty) => {
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if ty.is_rc() {
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format!("an `Rc`")
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} else if ty.is_arc() {
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format!("an `Arc`")
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} else {
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format!("a dereference of `{}`", ty)
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}
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}
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BorrowedContentSource::OverloadedIndex(ty) => format!("an index of `{}`", ty),
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}
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}
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fn from_call(func: Ty<'tcx>, tcx: TyCtxt<'tcx>) -> Option<Self> {
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match func.sty {
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ty::FnDef(def_id, substs) => {
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@ -1,17 +1,14 @@
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use rustc::hir;
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use rustc::hir::Node;
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use rustc::mir::{self, BindingForm, Constant, ClearCrossCrate, Local, Location, Body};
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use rustc::mir::{
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Mutability, Operand, Place, PlaceBase, Projection, ProjectionElem, Static, StaticKind,
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};
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use rustc::mir::{Terminator, TerminatorKind};
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use rustc::ty::{self, Const, DefIdTree, Ty, TyS, TyCtxt};
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use rustc::mir::{self, BindingForm, ClearCrossCrate, Local, Location, Body};
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use rustc::mir::{Mutability, Place, PlaceBase, Projection, ProjectionElem, Static, StaticKind};
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use rustc::ty::{self, Ty, TyCtxt};
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use rustc_data_structures::indexed_vec::Idx;
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use syntax_pos::Span;
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use syntax_pos::symbol::kw;
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use crate::dataflow::move_paths::InitLocation;
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use crate::borrow_check::MirBorrowckCtxt;
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use crate::borrow_check::error_reporting::BorrowedContentSource;
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use crate::util::borrowck_errors::{BorrowckErrors, Origin};
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use crate::util::collect_writes::FindAssignments;
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use crate::util::suggest_ref_mut;
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@ -43,6 +40,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
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let mut err;
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let item_msg;
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let reason;
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let mut opt_source = None;
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let access_place_desc = self.describe_place(access_place);
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debug!("report_mutability_error: access_place_desc={:?}", access_place_desc);
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@ -103,23 +101,20 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
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item_msg = format!("`{}`", access_place_desc.unwrap());
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reason = ", as it is immutable for the pattern guard".to_string();
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} else {
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let pointer_type =
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if base.ty(self.body, self.infcx.tcx).ty.is_region_ptr() {
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"`&` reference"
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} else {
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"`*const` pointer"
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};
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let source = self.borrowed_content_source(base);
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let pointer_type = source.describe_for_immutable_place();
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opt_source = Some(source);
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if let Some(desc) = access_place_desc {
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item_msg = format!("`{}`", desc);
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reason = match error_access {
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AccessKind::Move |
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AccessKind::Mutate => format!(" which is behind a {}", pointer_type),
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AccessKind::Mutate => format!(" which is behind {}", pointer_type),
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AccessKind::MutableBorrow => {
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format!(", as it is behind a {}", pointer_type)
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format!(", as it is behind {}", pointer_type)
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}
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}
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} else {
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item_msg = format!("data in a {}", pointer_type);
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item_msg = format!("data in {}", pointer_type);
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reason = String::new();
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}
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}
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@ -457,59 +452,31 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
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}
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Place::Projection(box Projection {
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base: Place::Base(PlaceBase::Local(local)),
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base: _,
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elem: ProjectionElem::Deref,
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}) if error_access == AccessKind::MutableBorrow => {
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}) => {
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err.span_label(span, format!("cannot {ACT}", ACT = act));
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let mpi = self.move_data.rev_lookup.find_local(*local);
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for i in self.move_data.init_path_map[mpi].iter() {
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if let InitLocation::Statement(location) = self.move_data.inits[*i].location {
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if let Some(
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Terminator {
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kind: TerminatorKind::Call {
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func: Operand::Constant(box Constant {
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literal: Const {
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ty: &TyS {
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sty: ty::FnDef(id, substs),
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..
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},
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..
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},
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..
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}),
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..
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},
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..
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}
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) = &self.body.basic_blocks()[location.block].terminator {
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let index_trait = self.infcx.tcx.lang_items().index_trait();
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if self.infcx.tcx.parent(id) == index_trait {
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let mut found = false;
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self.infcx.tcx.for_each_relevant_impl(
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self.infcx.tcx.lang_items().index_mut_trait().unwrap(),
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substs.type_at(0),
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|_relevant_impl| {
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found = true;
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}
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);
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let extra = if found {
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String::new()
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} else {
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format!(", but it is not implemented for `{}`",
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substs.type_at(0))
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};
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err.help(
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&format!(
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"trait `IndexMut` is required to modify indexed content{}",
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extra,
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),
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);
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}
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}
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match opt_source {
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Some(BorrowedContentSource::OverloadedDeref(ty)) => {
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err.help(
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&format!(
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"trait `DerefMut` is required to modify through a dereference, \
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but it is not implemented for `{}`",
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ty,
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),
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);
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},
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Some(BorrowedContentSource::OverloadedIndex(ty)) => {
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err.help(
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&format!(
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"trait `IndexMut` is required to modify indexed content, \
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but it is not implemented for `{}`",
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ty,
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),
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);
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}
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_ => (),
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}
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}
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@ -2,18 +2,7 @@
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// Deref and not DerefMut is implemented.
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use std::ops::Deref;
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struct Rc<T> {
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value: *const T
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}
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impl<T> Deref for Rc<T> {
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type Target = T;
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fn deref(&self) -> &T {
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unsafe { &*self.value }
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}
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}
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use std::rc::Rc;
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struct Point {
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x: isize,
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@ -1,86 +1,114 @@
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:47:19
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:36:19
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LL | let __isize = &mut x.y;
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| ^^^^^^^^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:51:19
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:40:19
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LL | let __isize = &mut x.y;
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| ^^^^^^^^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:59:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:48:5
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LL | &mut x.y
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| ^^^^^^^^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:63:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:52:5
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LL | &mut x.y
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| ^^^^^^^^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0594]: cannot assign to data in a `&` reference
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:67:5
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error[E0594]: cannot assign to data in an `Rc`
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:56:5
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LL | x.y = 3;
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| ^^^^^^^ cannot assign
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0594]: cannot assign to data in a `&` reference
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:71:5
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error[E0594]: cannot assign to data in an `Rc`
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:60:5
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LL | x.y = 3;
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| ^^^^^^^ cannot assign
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0594]: cannot assign to data in a `&` reference
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:75:5
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error[E0594]: cannot assign to data in an `Rc`
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:64:5
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LL | x.y = 3;
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| ^^^^^^^ cannot assign
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:83:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:72:5
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LL | x.set(0, 0);
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| ^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:87:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:76:5
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LL | x.set(0, 0);
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| ^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:95:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:84:5
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|
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LL | x.y_mut()
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| ^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:99:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:88:5
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|
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LL | x.y_mut()
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| ^ cannot borrow as mutable
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:103:6
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:92:6
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|
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LL | *x.y_mut() = 3;
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| ^ cannot borrow as mutable
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:107:6
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:96:6
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|
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LL | *x.y_mut() = 3;
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| ^ cannot borrow as mutable
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:111:6
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-auto-deref.rs:100:6
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|
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LL | *x.y_mut() = 3;
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| ^ cannot borrow as mutable
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<Point>`
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error: aborting due to 14 previous errors
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@ -2,18 +2,7 @@
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// Deref and not DerefMut is implemented.
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use std::ops::Deref;
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struct Rc<T> {
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value: *const T
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}
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impl<T> Deref for Rc<T> {
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type Target = T;
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fn deref<'a>(&'a self) -> &'a T {
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unsafe { &*self.value }
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}
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}
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use std::rc::Rc;
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fn deref_imm(x: Rc<isize>) {
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let __isize = &*x;
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@ -1,44 +1,58 @@
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:23:19
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:12:19
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|
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LL | let __isize = &mut *x;
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| ^^^^^^^ cannot borrow as mutable
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<isize>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:27:19
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:16:19
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|
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LL | let __isize = &mut *x;
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| ^^^^^^^ cannot borrow as mutable
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<isize>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:35:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:24:5
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|
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LL | &mut **x
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| ^^^^^^^^ cannot borrow as mutable
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<isize>`
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error[E0596]: cannot borrow data in a `&` reference as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:39:5
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error[E0596]: cannot borrow data in an `Rc` as mutable
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--> $DIR/borrowck-borrow-overloaded-deref.rs:28:5
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|
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LL | &mut **x
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| ^^^^^^^^ cannot borrow as mutable
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<isize>`
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error[E0594]: cannot assign to data in a `&` reference
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--> $DIR/borrowck-borrow-overloaded-deref.rs:43:5
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error[E0594]: cannot assign to data in an `Rc`
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--> $DIR/borrowck-borrow-overloaded-deref.rs:32:5
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|
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LL | *x = 3;
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| ^^^^^^ cannot assign
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|
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= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<isize>`
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error[E0594]: cannot assign to data in a `&` reference
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--> $DIR/borrowck-borrow-overloaded-deref.rs:47:5
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error[E0594]: cannot assign to data in an `Rc`
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--> $DIR/borrowck-borrow-overloaded-deref.rs:36:5
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|
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LL | **x = 3;
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| ^^^^^^^ cannot assign
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|
|
||||
= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<isize>`
|
||||
|
||||
error[E0594]: cannot assign to data in a `&` reference
|
||||
--> $DIR/borrowck-borrow-overloaded-deref.rs:51:5
|
||||
error[E0594]: cannot assign to data in an `Rc`
|
||||
--> $DIR/borrowck-borrow-overloaded-deref.rs:40:5
|
||||
|
|
||||
LL | **x = 3;
|
||||
| ^^^^^^^ cannot assign
|
||||
|
|
||||
= help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::rc::Rc<isize>`
|
||||
|
||||
error: aborting due to 7 previous errors
|
||||
|
||||
|
||||
@ -54,6 +54,6 @@ fn main() {
|
||||
x: 1,
|
||||
};
|
||||
s[2] = 20;
|
||||
//~^ ERROR cannot assign to data in a `&` reference
|
||||
//~^ ERROR cannot assign to data in an index of `Bar`
|
||||
drop(rs);
|
||||
}
|
||||
|
||||
@ -21,11 +21,13 @@ LL | f[&s] = 10;
|
||||
LL | drop(rs);
|
||||
| -- mutable borrow later used here
|
||||
|
||||
error[E0594]: cannot assign to data in a `&` reference
|
||||
error[E0594]: cannot assign to data in an index of `Bar`
|
||||
--> $DIR/borrowck-overloaded-index-ref-index.rs:56:5
|
||||
|
|
||||
LL | s[2] = 20;
|
||||
| ^^^^^^^^^ cannot assign
|
||||
|
|
||||
= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `Bar`
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
|
||||
|
||||
@ -3,8 +3,6 @@ error[E0596]: cannot borrow data in a `&` reference as mutable
|
||||
|
|
||||
LL | Index::index(&v, 1..2).make_ascii_uppercase();
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
|
||||
|
|
||||
= help: trait `IndexMut` is required to modify indexed content
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0596]: cannot borrow data in a `&` reference as mutable
|
||||
error[E0596]: cannot borrow data in an index of `std::collections::HashMap<&str, std::string::String>` as mutable
|
||||
--> $DIR/index-mut-help.rs:11:5
|
||||
|
|
||||
LL | map["peter"].clear();
|
||||
@ -6,13 +6,15 @@ LL | map["peter"].clear();
|
||||
|
|
||||
= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
|
||||
|
||||
error[E0594]: cannot assign to data in a `&` reference
|
||||
error[E0594]: cannot assign to data in an index of `std::collections::HashMap<&str, std::string::String>`
|
||||
--> $DIR/index-mut-help.rs:12:5
|
||||
|
|
||||
LL | map["peter"] = "0".to_string();
|
||||
| ^^^^^^^^^^^^ cannot assign
|
||||
|
|
||||
= help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `std::collections::HashMap<&str, std::string::String>`
|
||||
|
||||
error[E0596]: cannot borrow data in a `&` reference as mutable
|
||||
error[E0596]: cannot borrow data in an index of `std::collections::HashMap<&str, std::string::String>` as mutable
|
||||
--> $DIR/index-mut-help.rs:13:13
|
||||
|
|
||||
LL | let _ = &mut map["peter"];
|
||||
|
||||
@ -2,6 +2,6 @@ use std::collections::HashMap;
|
||||
fn main() {
|
||||
let things: HashMap<String, Vec<String>> = HashMap::new();
|
||||
for src in things.keys() {
|
||||
things[src.as_str()].sort(); //~ ERROR cannot borrow data in a `&` reference as mutable
|
||||
things[src.as_str()].sort(); //~ ERROR cannot borrow data in an index of
|
||||
}
|
||||
}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0596]: cannot borrow data in a `&` reference as mutable
|
||||
error[E0596]: cannot borrow data in an index of `std::collections::HashMap<std::string::String, std::vec::Vec<std::string::String>>` as mutable
|
||||
--> $DIR/issue-41726.rs:5:9
|
||||
|
|
||||
LL | things[src.as_str()].sort();
|
||||
|
||||
Loading…
Reference in New Issue
Block a user