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Rollup merge of #98283 - TaKO8Ki:point-at-private-fields-in-struct-literal, r=compiler-errors

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Point at private fields in struct literal

closes #95872
This commit is contained in:
Michael Goulet 2022-06-23 14:39:08 -07:00 • committed by GitHub
commit 41cb5e9439
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 107 additions and 19 deletions
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72
compiler/rustc_typeck/src/check/expr.rs
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@ -26,10 +26,10 @@ use crate::errors::{AddressOfTemporaryTaken, ReturnStmtOutsideOfFnBody, StructEx
use rustc_ast as ast;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_errors::Diagnostic;
use rustc_errors::EmissionGuarantee;
use rustc_errors::ErrorGuaranteed;
use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder, DiagnosticId};
use rustc_errors::{
pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, DiagnosticId,
EmissionGuarantee, ErrorGuaranteed,
};
use rustc_hir as hir;
use rustc_hir::def::{CtorKind, DefKind, Res};
use rustc_hir::def_id::DefId;
@ -1701,12 +1701,17 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
};
self.typeck_results.borrow_mut().fru_field_types_mut().insert(expr_id, fru_tys);
} else if adt_kind != AdtKind::Union && !remaining_fields.is_empty() {
let inaccessible_remaining_fields = remaining_fields.iter().any(|(_, (_, field))| {
!field.vis.is_accessible_from(tcx.parent_module(expr_id).to_def_id(), tcx)
});
debug!(?remaining_fields);
let private_fields: Vec<&ty::FieldDef> = variant
.fields
.iter()
.filter(|field| {
!field.vis.is_accessible_from(tcx.parent_module(expr_id).to_def_id(), tcx)
})
.collect();
if inaccessible_remaining_fields {
self.report_inaccessible_fields(adt_ty, span);
if !private_fields.is_empty() {
self.report_private_fields(adt_ty, span, private_fields, ast_fields);
} else {
self.report_missing_fields(
adt_ty,
@ -1830,7 +1835,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
/// Report an error for a struct field expression when there are invisible fields.
///
/// ```text
/// error: cannot construct `Foo` with struct literal syntax due to inaccessible fields
/// error: cannot construct `Foo` with struct literal syntax due to private fields
/// --> src/main.rs:8:5
/// |
/// 8 | foo::Foo {};
@ -1838,13 +1843,54 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
///
/// error: aborting due to previous error
/// ```
fn report_inaccessible_fields(&self, adt_ty: Ty<'tcx>, span: Span) {
self.tcx.sess.span_err(
fn report_private_fields(
&self,
adt_ty: Ty<'tcx>,
span: Span,
private_fields: Vec<&ty::FieldDef>,
used_fields: &'tcx [hir::ExprField<'tcx>],
) {
let mut err = self.tcx.sess.struct_span_err(
span,
&format!(
"cannot construct `{adt_ty}` with struct literal syntax due to inaccessible fields",
"cannot construct `{adt_ty}` with struct literal syntax due to private fields",
),
);
let (used_private_fields, remaining_private_fields): (
Vec<(Symbol, Span, bool)>,
Vec<(Symbol, Span, bool)>,
) = private_fields
.iter()
.map(|field| {
match used_fields.iter().find(|used_field| field.name == used_field.ident.name) {
Some(used_field) => (field.name, used_field.span, true),
None => (field.name, self.tcx.def_span(field.did), false),
}
})
.partition(|field| field.2);
err.span_labels(used_private_fields.iter().map(|(_, span, _)| *span), "private field");
if !remaining_private_fields.is_empty() {
let remaining_private_fields_len = remaining_private_fields.len();
let names = match &remaining_private_fields
.iter()
.map(|(name, _, _)| name.to_string())
.collect::<Vec<_>>()[..]
{
_ if remaining_private_fields_len > 6 => String::new(),
[name] => format!("`{name}` "),
[names @ .., last] => {
let names = names.iter().map(|name| format!("`{name}`")).collect::<Vec<_>>();
format!("{} and `{last}` ", names.join(", "))
}
[] => unreachable!(),
};
err.note(format!(
"... and other private field{s} {names}that {were} not provided",
s = pluralize!(remaining_private_fields_len),
were = pluralize!("was", remaining_private_fields_len),
));
}
err.emit();
}
fn report_unknown_field(