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Make note_source_of_type_mismatch_constraint simpler
This commit is contained in:
Michael Goulet
parent
4087deaccd
commit
42c4373ad1
@ -1,6 +1,5 @@
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use crate::FnCtxt;
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use rustc_ast::util::parser::PREC_POSTFIX;
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use rustc_data_structures::fx::FxHashMap;
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use rustc_errors::MultiSpan;
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use rustc_errors::{Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed};
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use rustc_hir as hir;
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@ -13,15 +12,13 @@ use rustc_middle::lint::in_external_macro;
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use rustc_middle::middle::stability::EvalResult;
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use rustc_middle::ty::adjustment::AllowTwoPhase;
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use rustc_middle::ty::error::{ExpectedFound, TypeError};
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use rustc_middle::ty::fold::{BottomUpFolder, TypeFolder};
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use rustc_middle::ty::print::{with_forced_trimmed_paths, with_no_trimmed_paths};
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use rustc_middle::ty::relate::TypeRelation;
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use rustc_middle::ty::{self, Article, AssocItem, Ty, TypeAndMut, TypeVisitableExt};
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use rustc_middle::ty::fold::BottomUpFolder;
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use rustc_middle::ty::print::with_no_trimmed_paths;
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use rustc_middle::ty::{self, Article, AssocItem, Ty, TypeAndMut, TypeFoldable};
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use rustc_span::symbol::{sym, Symbol};
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use rustc_span::{BytePos, Span};
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use rustc_span::{BytePos, Span, DUMMY_SP};
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use rustc_target::abi::FieldIdx;
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use rustc_trait_selection::infer::InferCtxtExt as _;
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use rustc_trait_selection::traits::error_reporting::method_chain::CollectAllMismatches;
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use rustc_trait_selection::traits::ObligationCause;
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use super::method::probe;
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@ -62,9 +59,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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|| self.suggest_into(err, expr, expr_ty, expected)
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|| self.suggest_floating_point_literal(err, expr, expected)
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|| self.suggest_null_ptr_for_literal_zero_given_to_ptr_arg(err, expr, expected)
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|| self.note_result_coercion(err, expr, expected, expr_ty);
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|| self.suggest_coercing_result_via_try_operator(err, expr, expected, expr_ty);
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if !suggested {
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self.point_at_expr_source_of_inferred_type(err, expr, expr_ty, expected, expr.span);
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self.note_source_of_type_mismatch_constraint(err, expr, expected);
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}
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}
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@ -218,37 +216,34 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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(expected, Some(err))
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}
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pub fn point_at_expr_source_of_inferred_type(
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/// Notes the point at which a variable is constrained to some type incompatible
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/// with `expected_ty`.
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pub fn note_source_of_type_mismatch_constraint(
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&self,
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err: &mut Diagnostic,
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expr: &hir::Expr<'_>,
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found: Ty<'tcx>,
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expected: Ty<'tcx>,
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mismatch_span: Span,
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expected_ty: Ty<'tcx>,
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) -> bool {
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let map = self.tcx.hir();
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let hir = self.tcx.hir();
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let hir::ExprKind::Path(hir::QPath::Resolved(None, p)) = expr.kind else { return false; };
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let [hir::PathSegment { ident, args: None, .. }] = p.segments else { return false; };
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let hir::def::Res::Local(hir_id) = p.res else { return false; };
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let Some(hir::Node::Pat(pat)) = map.find(hir_id) else { return false; };
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let Some(hir::Node::Local(hir::Local {
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ty: None,
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init: Some(init),
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..
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})) = map.find_parent(pat.hir_id) else { return false; };
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let Some(ty) = self.node_ty_opt(init.hir_id) else { return false; };
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if ty.is_closure() || init.span.overlaps(expr.span) || pat.span.from_expansion() {
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return false;
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}
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let hir::def::Res::Local(local_hir_id) = p.res else { return false; };
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let hir::Node::Pat(pat) = hir.get(local_hir_id) else { return false; };
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let (init_ty_hir_id, init) = match hir.get_parent(pat.hir_id) {
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hir::Node::Local(hir::Local { ty: Some(ty), init, .. }) => (ty.hir_id, *init),
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hir::Node::Local(hir::Local { init: Some(init), .. }) => (init.hir_id, Some(*init)),
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_ => return false,
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};
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let Some(init_ty) = self.node_ty_opt(init_ty_hir_id) else { return false; };
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// Locate all the usages of the relevant binding.
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struct FindExprs<'hir> {
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struct FindExprs<'tcx> {
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hir_id: hir::HirId,
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uses: Vec<&'hir hir::Expr<'hir>>,
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uses: Vec<&'tcx hir::Expr<'tcx>>,
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}
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impl<'v> Visitor<'v> for FindExprs<'v> {
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fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) {
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impl<'tcx> Visitor<'tcx> for FindExprs<'tcx> {
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fn visit_expr(&mut self, ex: &'tcx hir::Expr<'tcx>) {
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if let hir::ExprKind::Path(hir::QPath::Resolved(None, path)) = ex.kind
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&& let hir::def::Res::Local(hir_id) = path.res
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&& hir_id == self.hir_id
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@ -259,180 +254,71 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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}
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}
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let mut expr_finder = FindExprs { hir_id, uses: vec![] };
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let id = map.get_parent_item(hir_id);
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let hir_id: hir::HirId = id.into();
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let Some(node) = map.find(hir_id) else { return false; };
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let Some(body_id) = node.body_id() else { return false; };
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let body = map.body(body_id);
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let mut expr_finder = FindExprs { hir_id: local_hir_id, uses: init.into_iter().collect() };
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let body =
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hir.body(hir.maybe_body_owned_by(self.body_id).expect("expected item to have body"));
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expr_finder.visit_expr(body.value);
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// Hack to make equality checks on types with inference variables and regions useful.
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let mut eraser = BottomUpFolder {
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tcx: self.tcx,
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lt_op: |_| self.tcx.lifetimes.re_erased,
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ct_op: |c| c,
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ty_op: |t| match *t.kind() {
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ty::Infer(ty::TyVar(_)) => self.tcx.mk_ty_var(ty::TyVid::from_u32(0)),
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ty::Infer(ty::IntVar(_)) => self.tcx.mk_int_var(ty::IntVid { index: 0 }),
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ty::Infer(ty::FloatVar(_)) => self.tcx.mk_float_var(ty::FloatVid { index: 0 }),
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_ => t,
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},
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};
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let mut prev = eraser.fold_ty(ty);
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let mut prev_span: Option<Span> = None;
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for binding in expr_finder.uses {
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// In every expression where the binding is referenced, we will look at that
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// expression's type and see if it is where the incorrect found type was fully
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// "materialized" and point at it. We will also try to provide a suggestion there.
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if let Some(hir::Node::Expr(expr)
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| hir::Node::Stmt(hir::Stmt {
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kind: hir::StmtKind::Expr(expr) | hir::StmtKind::Semi(expr),
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..
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})) = &map.find_parent(binding.hir_id)
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&& let hir::ExprKind::MethodCall(segment, rcvr, args, _span) = expr.kind
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&& rcvr.hir_id == binding.hir_id
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&& let Some(def_id) = self.typeck_results.borrow().type_dependent_def_id(expr.hir_id)
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{
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// We special case methods, because they can influence inference through the
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// call's arguments and we can provide a more explicit span.
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let sig = self.tcx.fn_sig(def_id).subst_identity();
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let def_self_ty = sig.input(0).skip_binder();
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let param_tys = sig.inputs().skip_binder().iter().skip(1);
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// If there's an arity mismatch, pointing out the call as the source of an inference
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// can be misleading, so we skip it.
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if param_tys.len() != args.len() {
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continue;
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}
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let rcvr_ty = self.node_ty(rcvr.hir_id);
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// Get the evaluated type *after* calling the method call, so that the influence
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// of the arguments can be reflected in the receiver type. The receiver
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// expression has the type *before* this analysis is done.
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let ty = match self.lookup_probe_for_diagnostic(
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segment.ident,
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rcvr_ty,
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expr,
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probe::ProbeScope::TraitsInScope,
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None,
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) {
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Ok(pick) => eraser.fold_ty(pick.self_ty),
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Err(_) => rcvr_ty,
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};
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// Remove one layer of references to account for `&mut self` and
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// `&self`, so that we can compare it against the binding.
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let (ty, def_self_ty) = match (ty.kind(), def_self_ty.kind()) {
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(ty::Ref(_, ty, a), ty::Ref(_, self_ty, b)) if a == b => (*ty, *self_ty),
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_ => (ty, def_self_ty),
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};
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let mut param_args = FxHashMap::default();
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let mut param_expected = FxHashMap::default();
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let mut param_found = FxHashMap::default();
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if self.can_eq(self.param_env, ty, found) {
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// We only point at the first place where the found type was inferred.
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for (param_ty, arg) in param_tys.zip(args) {
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if def_self_ty.contains(*param_ty) && let ty::Param(_) = param_ty.kind() {
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// We found an argument that references a type parameter in `Self`,
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// so we assume that this is the argument that caused the found
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// type, which we know already because of `can_eq` above was first
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// inferred in this method call.
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let arg_ty = self.node_ty(arg.hir_id);
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if !arg.span.overlaps(mismatch_span) {
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err.span_label(
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arg.span,
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&format!(
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"this is of type `{arg_ty}`, which causes `{ident}` to be \
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inferred as `{ty}`",
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),
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);
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}
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param_args.insert(param_ty, (arg, arg_ty));
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let fudge_equals_found_ty = |use_ty: Ty<'tcx>| {
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use rustc_infer::infer::type_variable::*;
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use rustc_middle::infer::unify_key::*;
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let use_ty = use_ty.fold_with(&mut BottomUpFolder {
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tcx: self.tcx,
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ty_op: |ty| {
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if let ty::Infer(infer) = ty.kind() {
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match infer {
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ty::InferTy::TyVar(_) => self.next_ty_var(TypeVariableOrigin {
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kind: TypeVariableOriginKind::MiscVariable,
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span: DUMMY_SP,
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}),
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ty::InferTy::IntVar(_) => self.next_int_var(),
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ty::InferTy::FloatVar(_) => self.next_float_var(),
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_ => bug!(),
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}
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} else {
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ty
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}
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}
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},
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lt_op: |_| self.tcx.lifetimes.re_erased,
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ct_op: |ct| {
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if let ty::ConstKind::Infer(_) = ct.kind() {
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self.next_const_var(
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ct.ty(),
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ConstVariableOrigin {
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kind: ConstVariableOriginKind::MiscVariable,
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span: DUMMY_SP,
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},
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)
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} else {
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ct
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}
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},
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});
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self.can_eq(self.param_env, expected_ty, use_ty)
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};
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// Here we find, for a type param `T`, the type that `T` is in the current
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// method call *and* in the original expected type. That way, we can see if we
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// can give any structured suggestion for the function argument.
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let mut c = CollectAllMismatches {
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infcx: &self.infcx,
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param_env: self.param_env,
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errors: vec![],
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};
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let _ = c.relate(def_self_ty, ty);
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for error in c.errors {
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if let TypeError::Sorts(error) = error {
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param_found.insert(error.expected, error.found);
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}
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}
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c.errors = vec![];
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let _ = c.relate(def_self_ty, expected);
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for error in c.errors {
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if let TypeError::Sorts(error) = error {
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param_expected.insert(error.expected, error.found);
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}
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}
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for (param, (arg, arg_ty)) in param_args.iter() {
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let Some(expected) = param_expected.get(param) else { continue; };
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let Some(found) = param_found.get(param) else { continue; };
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if !self.can_eq(self.param_env, *arg_ty, *found) { continue; }
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self.emit_coerce_suggestions(err, arg, *found, *expected, None, None);
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}
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if !fudge_equals_found_ty(init_ty) {
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return false;
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}
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let ty = eraser.fold_ty(ty);
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if ty.references_error() {
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break;
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}
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if ty != prev
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&& param_args.is_empty()
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&& self.can_eq(self.param_env, ty, found)
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{
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// We only point at the first place where the found type was inferred.
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if !segment.ident.span.overlaps(mismatch_span) {
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err.span_label(
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segment.ident.span,
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with_forced_trimmed_paths!(format!(
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"here the type of `{ident}` is inferred to be `{ty}`",
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)),
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);}
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break;
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} else if !param_args.is_empty() {
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break;
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}
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prev = ty;
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} else {
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let ty = eraser.fold_ty(self.node_ty(binding.hir_id));
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if ty.references_error() {
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break;
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}
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if ty != prev
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&& let Some(span) = prev_span
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&& self.can_eq(self.param_env, ty, found)
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{
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// We only point at the first place where the found type was inferred.
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// We use the *previous* span because if the type is known *here* it means
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// it was *evaluated earlier*. We don't do this for method calls because we
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// evaluate the method's self type eagerly, but not in any other case.
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if !span.overlaps(mismatch_span) {
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err.span_label(
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span,
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with_forced_trimmed_paths!(format!(
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"here the type of `{ident}` is inferred to be `{ty}`",
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)),
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);
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}
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break;
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}
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prev = ty;
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for window in expr_finder.uses.windows(2) {
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let [binding, next_usage] = *window else { continue; };
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let Some(next_use_ty) = self.node_ty_opt(next_usage.hir_id) else { continue; };
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if !fudge_equals_found_ty(next_use_ty) {
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err.span_label(
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binding.span,
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format!("here the type of `{ident}` is inferred to be `{next_use_ty}`"),
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);
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return true;
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}
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if binding.hir_id == expr.hir_id {
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// Do not look at expressions that come after the expression we were originally
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// evaluating and had a type error.
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if next_usage.hir_id == expr.hir_id {
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break;
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}
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prev_span = Some(binding.span);
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}
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true
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// We must've not found something that constrained the expr.
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false
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}
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fn annotate_expected_due_to_let_ty(
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@ -708,7 +594,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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);
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}
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pub(crate) fn note_result_coercion(
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pub(crate) fn suggest_coercing_result_via_try_operator(
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&self,
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err: &mut Diagnostic,
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expr: &hir::Expr<'tcx>,
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@ -807,24 +807,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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full_call_span,
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format!("arguments to this {} are incorrect", call_name),
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);
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if let (Some(callee_ty), hir::ExprKind::MethodCall(_, rcvr, _, _)) =
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(callee_ty, &call_expr.kind)
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{
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// Type that would have accepted this argument if it hadn't been inferred earlier.
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// FIXME: We leave an inference variable for now, but it'd be nice to get a more
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// specific type to increase the accuracy of the diagnostic.
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let expected = self.infcx.next_ty_var(TypeVariableOrigin {
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kind: TypeVariableOriginKind::MiscVariable,
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span: full_call_span,
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});
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self.point_at_expr_source_of_inferred_type(
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&mut err,
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rcvr,
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expected,
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callee_ty,
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provided_arg_span,
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);
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}
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// TODO: We would like to point out when the rcvr was constrained
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// such that the arg mismatch occurs.
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// Call out where the function is defined
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self.label_fn_like(
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&mut err,
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@ -67,9 +67,6 @@ LL | x == 5
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error[E0308]: mismatched types
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--> $DIR/assignment-in-if.rs:44:18
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|
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LL | if y = (Foo { foo: x }) {
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| - here the type of `x` is inferred to be `usize`
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...
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LL | if x == x && x = x && x == x {
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| ------ ^ expected `bool`, found `usize`
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| |
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@ -78,9 +75,6 @@ LL | if x == x && x = x && x == x {
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error[E0308]: mismatched types
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--> $DIR/assignment-in-if.rs:44:22
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|
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LL | if y = (Foo { foo: x }) {
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| - here the type of `x` is inferred to be `usize`
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...
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LL | if x == x && x = x && x == x {
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| ^ expected `bool`, found `usize`
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@ -98,9 +92,6 @@ LL | if x == x && x == x && x == x {
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error[E0308]: mismatched types
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--> $DIR/assignment-in-if.rs:51:28
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|
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LL | if y = (Foo { foo: x }) {
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| - here the type of `x` is inferred to be `usize`
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...
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LL | if x == x && x == x && x = x {
|
||||
| ---------------- ^ expected `bool`, found `usize`
|
||||
| |
|
||||
|
||||
@ -2,7 +2,6 @@
|
||||
fn main() {
|
||||
let mut v = Vec::new();
|
||||
v.push(0i32);
|
||||
//~^ NOTE this is of type `i32`, which causes `v` to be inferred as `Vec<i32>`
|
||||
v.push(0);
|
||||
v.push(1i32); //~ ERROR mismatched types
|
||||
//~^ NOTE expected `i32`, found `u32`
|
||||
|
||||
@ -2,7 +2,6 @@
|
||||
fn main() {
|
||||
let mut v = Vec::new();
|
||||
v.push(0i32);
|
||||
//~^ NOTE this is of type `i32`, which causes `v` to be inferred as `Vec<i32>`
|
||||
v.push(0);
|
||||
v.push(1u32); //~ ERROR mismatched types
|
||||
//~^ NOTE expected `i32`, found `u32`
|
||||
|
||||
@ -1,9 +1,6 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/point-at-inference-3.rs:7:12
|
||||
--> $DIR/point-at-inference-3.rs:6:12
|
||||
|
|
||||
LL | v.push(0i32);
|
||||
| ---- this is of type `i32`, which causes `v` to be inferred as `Vec<i32>`
|
||||
...
|
||||
LL | v.push(1u32);
|
||||
| ---- ^^^^ expected `i32`, found `u32`
|
||||
| |
|
||||
|
||||
@ -11,6 +11,7 @@ fn main() {
|
||||
let s = S(None);
|
||||
s.infer(0i32);
|
||||
//~^ ERROR this method takes 2 arguments but 1 argument was supplied
|
||||
//~| NOTE here the type of `s` is inferred to be `S<i32, _>`
|
||||
//~| NOTE an argument is missing
|
||||
//~| HELP provide the argument
|
||||
let t: S<u32, _> = s;
|
||||
|
||||
@ -15,8 +15,11 @@ LL | s.infer(0i32, /* b */);
|
||||
| ~~~~~~~~~~~~~~~
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/point-at-inference-4.rs:16:24
|
||||
--> $DIR/point-at-inference-4.rs:17:24
|
||||
|
|
||||
LL | s.infer(0i32);
|
||||
| - here the type of `s` is inferred to be `S<i32, _>`
|
||||
...
|
||||
LL | let t: S<u32, _> = s;
|
||||
| --------- ^ expected `S<u32, _>`, found `S<i32, _>`
|
||||
| |
|
||||
|
||||
@ -6,7 +6,7 @@ fn main() {
|
||||
let mut foo = vec![];
|
||||
baz(&foo);
|
||||
for i in &v {
|
||||
foo.push(*i);
|
||||
foo.push(i);
|
||||
}
|
||||
baz(&foo);
|
||||
bar(foo); //~ ERROR E0308
|
||||
|
||||
@ -2,7 +2,7 @@ error[E0308]: mismatched types
|
||||
--> $DIR/point-at-inference.rs:12:9
|
||||
|
|
||||
LL | foo.push(i);
|
||||
| - this is of type `&{integer}`, which causes `foo` to be inferred as `Vec<&{integer}>`
|
||||
| --- here the type of `foo` is inferred to be `Vec<&{integer}>`
|
||||
...
|
||||
LL | bar(foo);
|
||||
| --- ^^^ expected `Vec<i32>`, found `Vec<&{integer}>`
|
||||
@ -16,10 +16,6 @@ note: function defined here
|
||||
|
|
||||
LL | fn bar(_: Vec<i32>) {}
|
||||
| ^^^ -----------
|
||||
help: consider dereferencing the borrow
|
||||
|
|
||||
LL | foo.push(*i);
|
||||
| +
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
||||
@ -7,7 +7,6 @@ LL | primes.contains(3);
|
||||
| | expected `&_`, found integer
|
||||
| | help: consider borrowing here: `&3`
|
||||
| arguments to this method are incorrect
|
||||
| here the type of `primes` is inferred to be `[_]`
|
||||
|
|
||||
= note: expected reference `&_`
|
||||
found type `{integer}`
|
||||
|
||||
@ -1,8 +1,6 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/bad-type-in-vec-push.rs:11:17
|
||||
|
|
||||
LL | vector.sort();
|
||||
| ------ here the type of `vector` is inferred to be `Vec<_>`
|
||||
LL | result.push(vector);
|
||||
| ---- ^^^^^^ expected integer, found `Vec<_>`
|
||||
| |
|
||||
|
||||
@ -2,9 +2,7 @@ error[E0308]: mismatched types
|
||||
--> $DIR/issue-107775.rs:35:16
|
||||
|
|
||||
LL | map.insert(1, Struct::do_something);
|
||||
| - -------------------- this is of type `fn(u8) -> Pin<Box<dyn Future<Output = ()> + Send>> {<Struct as Trait>::do_something::<'_>}`, which causes `map` to be inferred as `HashMap<{integer}, fn(u8) -> Pin<Box<dyn Future<Output = ()> + Send>> {<Struct as Trait>::do_something::<'_>}>`
|
||||
| |
|
||||
| this is of type `{integer}`, which causes `map` to be inferred as `HashMap<{integer}, fn(u8) -> Pin<Box<dyn Future<Output = ()> + Send>> {<Struct as Trait>::do_something::<'_>}>`
|
||||
| --- here the type of `map` is inferred to be `HashMap<{integer}, fn(u8) -> Pin<Box<dyn Future<Output = ()> + Send>> {<Struct as Trait>::do_something::<'_>}>`
|
||||
LL | Self { map }
|
||||
| ^^^ expected `HashMap<u16, fn(u8) -> Pin<...>>`, found `HashMap<{integer}, ...>`
|
||||
|
|
||||
|
||||
Loading…
Reference in New Issue
Block a user