diff options
Diffstat (limited to 'compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs')
| -rw-r--r-- | compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs | 91 |
1 files changed, 60 insertions, 31 deletions
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs index a46bdeb41..ea1b52daa 100644 --- a/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs +++ b/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs @@ -24,14 +24,14 @@ use rustc_hir_analysis::structured_errors::StructuredDiagnostic; use rustc_index::vec::IndexVec; use rustc_infer::infer::error_reporting::{FailureCode, ObligationCauseExt}; use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind}; -use rustc_infer::infer::InferOk; use rustc_infer::infer::TypeTrace; +use rustc_infer::infer::{DefineOpaqueTypes, InferOk}; use rustc_middle::ty::adjustment::AllowTwoPhase; use rustc_middle::ty::visit::TypeVisitableExt; -use rustc_middle::ty::{self, DefIdTree, IsSuggestable, Ty}; +use rustc_middle::ty::{self, IsSuggestable, Ty}; use rustc_session::Session; use rustc_span::symbol::{kw, Ident}; -use rustc_span::{self, sym, Span}; +use rustc_span::{self, sym, BytePos, Span}; use rustc_trait_selection::traits::{self, ObligationCauseCode, SelectionContext}; use std::iter; @@ -301,9 +301,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { // 3. Check if the formal type is a supertype of the checked one // and register any such obligations for future type checks - let supertype_error = self - .at(&self.misc(provided_arg.span), self.param_env) - .sup(formal_input_ty, coerced_ty); + let supertype_error = self.at(&self.misc(provided_arg.span), self.param_env).sup( + DefineOpaqueTypes::No, + formal_input_ty, + coerced_ty, + ); let subtyping_error = match supertype_error { Ok(InferOk { obligations, value: () }) => { self.register_predicates(obligations); @@ -470,7 +472,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { err_code: &str, fn_def_id: Option<DefId>, call_span: Span, - call_expr: &hir::Expr<'tcx>, + call_expr: &'tcx hir::Expr<'tcx>, ) { // Next, let's construct the error let (error_span, full_call_span, call_name, is_method) = match &call_expr.kind { @@ -585,7 +587,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { // Using probe here, since we don't want this subtyping to affect inference. let subtyping_error = self.probe(|_| { - self.at(&self.misc(arg_span), self.param_env).sup(formal_input_ty, coerced_ty).err() + self.at(&self.misc(arg_span), self.param_env) + .sup(DefineOpaqueTypes::No, formal_input_ty, coerced_ty) + .err() }); // Same as above: if either the coerce type or the checked type is an error type, @@ -764,7 +768,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { let (provided_ty, provided_span) = provided_arg_tys[*provided_idx]; let trace = mk_trace(provided_span, formal_and_expected_inputs[*expected_idx], provided_ty); - if !matches!(trace.cause.as_failure_code(*e), FailureCode::Error0308(_)) { + if !matches!(trace.cause.as_failure_code(*e), FailureCode::Error0308) { self.err_ctxt().report_and_explain_type_error(trace, *e).emit(); return true; } @@ -803,24 +807,20 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { full_call_span, format!("arguments to this {} are incorrect", call_name), ); - if let (Some(callee_ty), hir::ExprKind::MethodCall(_, rcvr, _, _)) = - (callee_ty, &call_expr.kind) + + if let hir::ExprKind::MethodCall(_, rcvr, _, _) = call_expr.kind + && provided_idx.as_usize() == expected_idx.as_usize() { - // Type that would have accepted this argument if it hadn't been inferred earlier. - // FIXME: We leave an inference variable for now, but it'd be nice to get a more - // specific type to increase the accuracy of the diagnostic. - let expected = self.infcx.next_ty_var(TypeVariableOrigin { - kind: TypeVariableOriginKind::MiscVariable, - span: full_call_span, - }); - self.point_at_expr_source_of_inferred_type( + self.note_source_of_type_mismatch_constraint( &mut err, rcvr, - expected, - callee_ty, - provided_arg_span, + crate::demand::TypeMismatchSource::Arg { + call_expr, + incompatible_arg: provided_idx.as_usize(), + }, ); } + // Call out where the function is defined self.label_fn_like( &mut err, @@ -890,8 +890,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { }; let mut errors = errors.into_iter().peekable(); + let mut only_extras_so_far = errors + .peek() + .map_or(false, |first| matches!(first, Error::Extra(arg_idx) if arg_idx.index() == 0)); let mut suggestions = vec![]; while let Some(error) = errors.next() { + only_extras_so_far &= matches!(error, Error::Extra(_)); + match error { Error::Invalid(provided_idx, expected_idx, compatibility) => { let (formal_ty, expected_ty) = formal_and_expected_inputs[expected_idx]; @@ -937,10 +942,34 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { if arg_idx.index() > 0 && let Some((_, prev)) = provided_arg_tys .get(ProvidedIdx::from_usize(arg_idx.index() - 1) - ) { - // Include previous comma - span = prev.shrink_to_hi().to(span); - } + ) { + // Include previous comma + span = prev.shrink_to_hi().to(span); + } + + // Is last argument for deletion in a row starting from the 0-th argument? + // Then delete the next comma, so we are not left with `f(, ...)` + // + // fn f() {} + // - f(0, 1,) + // + f() + if only_extras_so_far + && errors + .peek() + .map_or(true, |next_error| !matches!(next_error, Error::Extra(_))) + { + let next = provided_arg_tys + .get(arg_idx + 1) + .map(|&(_, sp)| sp) + .unwrap_or_else(|| { + // Subtract one to move before `)` + call_expr.span.with_lo(call_expr.span.hi() - BytePos(1)) + }); + + // Include next comma + span = span.until(next); + } + suggestions.push((span, String::new())); suggestion_text = match suggestion_text { @@ -1158,11 +1187,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { // index position where it *should have been*, which is *after* the previous one. if let Some(provided_idx) = provided_idx { prev = provided_idx.index() as i64; + continue; } let idx = ProvidedIdx::from_usize((prev + 1) as usize); - if let None = provided_idx - && let Some((_, arg_span)) = provided_arg_tys.get(idx) - { + if let Some((_, arg_span)) = provided_arg_tys.get(idx) { + prev += 1; // There is a type that was *not* found anywhere, so it isn't a move, but a // replacement and we look at what type it should have been. This will allow us // To suggest a multipart suggestion when encountering `foo(1, "")` where the def @@ -1380,7 +1409,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { self.demand_eqtype(init.span, local_ty, init_ty); init_ty } else { - self.check_expr_coercable_to_type(init, local_ty, None) + self.check_expr_coercible_to_type(init, local_ty, None) } } @@ -1665,7 +1694,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { /// Given a function block's `HirId`, returns its `FnDecl` if it exists, or `None` otherwise. fn get_parent_fn_decl(&self, blk_id: hir::HirId) -> Option<(&'tcx hir::FnDecl<'tcx>, Ident)> { let parent = self.tcx.hir().get_by_def_id(self.tcx.hir().get_parent_item(blk_id).def_id); - self.get_node_fn_decl(parent).map(|(fn_decl, ident, _)| (fn_decl, ident)) + self.get_node_fn_decl(parent).map(|(_, fn_decl, ident, _)| (fn_decl, ident)) } /// If `expr` is a `match` expression that has only one non-`!` arm, use that arm's tail |