Auto merge of #119047 - mu001999:fix/118772, r=wesleywiser
Check generic params after sigature for main-fn-ty Fixes #118772
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commit
e999d8b6e1
@ -92,24 +92,6 @@ fn main_fn_return_type_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> {
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let mut error = false;
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let main_diagnostics_def_id = main_fn_diagnostics_def_id(tcx, main_def_id, main_span);
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let main_fn_generics = tcx.generics_of(main_def_id);
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let main_fn_predicates = tcx.predicates_of(main_def_id);
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if main_fn_generics.count() != 0 || !main_fnsig.bound_vars().is_empty() {
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let generics_param_span = main_fn_generics_params_span(tcx, main_def_id);
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tcx.sess.emit_err(errors::MainFunctionGenericParameters {
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span: generics_param_span.unwrap_or(main_span),
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label_span: generics_param_span,
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});
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error = true;
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} else if !main_fn_predicates.predicates.is_empty() {
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// generics may bring in implicit predicates, so we skip this check if generics is present.
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let generics_where_clauses_span = main_fn_where_clauses_span(tcx, main_def_id);
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tcx.sess.emit_err(errors::WhereClauseOnMain {
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span: generics_where_clauses_span.unwrap_or(main_span),
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generics_span: generics_where_clauses_span,
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});
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error = true;
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}
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let main_asyncness = tcx.asyncness(main_def_id);
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if main_asyncness.is_async() {
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@ -142,10 +124,6 @@ fn main_fn_return_type_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> {
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if let Some(term_did) = tcx.lang_items().termination() {
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let return_ty = main_fnsig.output();
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let return_ty_span = main_fn_return_type_span(tcx, main_def_id).unwrap_or(main_span);
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if !return_ty.bound_vars().is_empty() {
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tcx.sess.emit_err(errors::MainFunctionReturnTypeGeneric { span: return_ty_span });
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error = true;
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}
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let return_ty = return_ty.skip_binder();
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let infcx = tcx.infer_ctxt().build();
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let cause = traits::ObligationCause::new(
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@ -180,7 +158,7 @@ fn main_fn_return_type_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> {
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Abi::Rust,
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));
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check_function_signature(
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if check_function_signature(
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tcx,
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ObligationCause::new(
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main_span,
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@ -189,7 +167,28 @@ fn main_fn_return_type_span(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Span> {
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),
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main_def_id,
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expected_sig,
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);
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)
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.is_err()
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{
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return;
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}
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let main_fn_generics = tcx.generics_of(main_def_id);
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let main_fn_predicates = tcx.predicates_of(main_def_id);
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if main_fn_generics.count() != 0 || !main_fnsig.bound_vars().is_empty() {
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let generics_param_span = main_fn_generics_params_span(tcx, main_def_id);
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tcx.sess.emit_err(errors::MainFunctionGenericParameters {
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span: generics_param_span.unwrap_or(main_span),
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label_span: generics_param_span,
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});
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} else if !main_fn_predicates.predicates.is_empty() {
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// generics may bring in implicit predicates, so we skip this check if generics is present.
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let generics_where_clauses_span = main_fn_where_clauses_span(tcx, main_def_id);
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tcx.sess.emit_err(errors::WhereClauseOnMain {
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span: generics_where_clauses_span.unwrap_or(main_span),
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generics_span: generics_where_clauses_span,
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});
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}
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}
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fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: DefId) {
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@ -255,7 +254,7 @@ fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: DefId) {
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Abi::Rust,
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));
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check_function_signature(
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let _ = check_function_signature(
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tcx,
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ObligationCause::new(
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start_span,
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@ -55,7 +55,7 @@ fn equate_intrinsic_type<'tcx>(
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&& gen_count_ok(own_counts.consts, n_cts, "const")
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{
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let it_def_id = it.owner_id.def_id;
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check_function_signature(
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let _ = check_function_signature(
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tcx,
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ObligationCause::new(it.span, it_def_id, ObligationCauseCode::IntrinsicType),
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it_def_id.into(),
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@ -77,6 +77,7 @@
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use check::check_mod_item_types;
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use rustc_data_structures::fx::{FxHashMap, FxHashSet};
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use rustc_errors::ErrorGuaranteed;
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use rustc_errors::{pluralize, struct_span_err, Diagnostic, DiagnosticBuilder};
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use rustc_hir::def_id::{DefId, LocalDefId};
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use rustc_hir::intravisit::Visitor;
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@ -570,7 +571,26 @@ pub fn check_function_signature<'tcx>(
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mut cause: ObligationCause<'tcx>,
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fn_id: DefId,
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expected_sig: ty::PolyFnSig<'tcx>,
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) {
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) -> Result<(), ErrorGuaranteed> {
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fn extract_span_for_error_reporting<'tcx>(
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tcx: TyCtxt<'tcx>,
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err: TypeError<'_>,
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cause: &ObligationCause<'tcx>,
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fn_id: LocalDefId,
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) -> rustc_span::Span {
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let mut args = {
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let node = tcx.hir().expect_owner(fn_id);
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let decl = node.fn_decl().unwrap_or_else(|| bug!("expected fn decl, found {:?}", node));
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decl.inputs.iter().map(|t| t.span).chain(std::iter::once(decl.output.span()))
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};
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match err {
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TypeError::ArgumentMutability(i)
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| TypeError::ArgumentSorts(ExpectedFound { .. }, i) => args.nth(i).unwrap(),
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_ => cause.span(),
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}
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}
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let local_id = fn_id.as_local().unwrap_or(CRATE_DEF_ID);
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let param_env = ty::ParamEnv::empty();
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@ -587,8 +607,7 @@ pub fn check_function_signature<'tcx>(
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Ok(()) => {
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let errors = ocx.select_all_or_error();
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if !errors.is_empty() {
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infcx.err_ctxt().report_fulfillment_errors(errors);
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return;
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return Err(infcx.err_ctxt().report_fulfillment_errors(errors));
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}
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}
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Err(err) => {
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@ -610,30 +629,14 @@ pub fn check_function_signature<'tcx>(
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false,
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false,
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);
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diag.emit();
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return;
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return Err(diag.emit());
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}
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}
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let outlives_env = OutlivesEnvironment::new(param_env);
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let _ = ocx.resolve_regions_and_report_errors(local_id, &outlives_env);
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fn extract_span_for_error_reporting<'tcx>(
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tcx: TyCtxt<'tcx>,
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err: TypeError<'_>,
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cause: &ObligationCause<'tcx>,
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fn_id: LocalDefId,
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) -> rustc_span::Span {
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let mut args = {
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let node = tcx.hir().expect_owner(fn_id);
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let decl = node.fn_decl().unwrap_or_else(|| bug!("expected fn decl, found {:?}", node));
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decl.inputs.iter().map(|t| t.span).chain(std::iter::once(decl.output.span()))
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};
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match err {
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TypeError::ArgumentMutability(i)
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| TypeError::ArgumentSorts(ExpectedFound { .. }, i) => args.nth(i).unwrap(),
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_ => cause.span(),
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}
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if let Err(e) = ocx.resolve_regions_and_report_errors(local_id, &outlives_env) {
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return Err(e);
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}
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Ok(())
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}
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@ -261,7 +261,7 @@ fn check_panic_info_fn(tcx: TyCtxt<'_>, fn_id: LocalDefId, fn_sig: ty::FnSig<'_>
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bounds,
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);
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check_function_signature(
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let _ = check_function_signature(
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tcx,
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ObligationCause::new(
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tcx.def_span(fn_id),
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@ -300,7 +300,7 @@ fn check_lang_start_fn<'tcx>(tcx: TyCtxt<'tcx>, fn_sig: ty::FnSig<'tcx>, def_id:
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Abi::Rust,
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));
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check_function_signature(
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let _ = check_function_signature(
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tcx,
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ObligationCause::new(
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tcx.def_span(def_id),
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3
tests/ui/entry-point/issue-118772.rs
Normal file
3
tests/ui/entry-point/issue-118772.rs
Normal file
@ -0,0 +1,3 @@
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fn main(_: &i32) { //~ ERROR `main` function has wrong type
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println!("Hello, world!");
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}
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12
tests/ui/entry-point/issue-118772.stderr
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12
tests/ui/entry-point/issue-118772.stderr
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@ -0,0 +1,12 @@
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error[E0580]: `main` function has wrong type
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--> $DIR/issue-118772.rs:1:1
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LL | fn main(_: &i32) {
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| ^^^^^^^^^^^^^^^^ incorrect number of function parameters
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= note: expected signature `fn()`
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found signature `for<'a> fn(&'a i32)`
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0580`.
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