if direct {
// this is a "direct", user-specified, rather than derived,
// obligation.
- flags.push(("direct", None));
+ flags.push(("direct".to_string(), None));
}
if let ObligationCauseCode::ItemObligation(item) = obligation.cause.code {
// Currently I'm leaving it for what I need for `try`.
if self.tcx.trait_of_item(item) == Some(trait_ref.def_id) {
method = self.tcx.item_name(item);
- flags.push(("from_method", None));
- flags.push(("from_method", Some(&*method)));
+ flags.push(("from_method".to_string(), None));
+ flags.push(("from_method".to_string(), Some(method.to_string())));
}
}
if let Some(k) = obligation.cause.span.compiler_desugaring_kind() {
desugaring = k.as_symbol().as_str();
- flags.push(("from_desugaring", None));
- flags.push(("from_desugaring", Some(&*desugaring)));
+ flags.push(("from_desugaring".to_string(), None));
+ flags.push(("from_desugaring".to_string(), Some(desugaring.to_string())));
+ }
+ let generics = self.tcx.generics_of(def_id);
+ let self_ty = trait_ref.self_ty();
+ let self_ty_str = self_ty.to_string();
+ flags.push(("_Self".to_string(), Some(self_ty_str.clone())));
+
+ for param in generics.types.iter() {
+ let name = param.name.as_str().to_string();
+ let ty = trait_ref.substs.type_for_def(param);
+ let ty_str = ty.to_string();
+ flags.push((name.clone(),
+ Some(ty_str.clone())));
+ }
+
+ if let Some(true) = self_ty.ty_to_def_id().map(|def_id| def_id.is_local()) {
+ flags.push(("crate_local".to_string(), None));
}
if let Ok(Some(command)) = OnUnimplementedDirective::of_item(
self.tcx, trait_ref.def_id, def_id
) {
- command.evaluate(self.tcx, trait_ref, &flags)
+ command.evaluate(self.tcx, trait_ref, &flags[..])
} else {
OnUnimplementedNote::empty()
}
.map(|t| (format!(" in `{}`", t), format!("within `{}`, ", t)))
.unwrap_or((String::new(), String::new()));
- let OnUnimplementedNote { message, label }
+ let OnUnimplementedNote { message, label, note }
= self.on_unimplemented_note(trait_ref, obligation);
let have_alt_message = message.is_some() || label.is_some();
trait_ref,
trait_ref.self_ty()));
}
+ if let Some(ref s) = note {
+ // If it has a custom "#[rustc_on_unimplemented]" note, let's display it
+ err.note(s.as_str());
+ }
self.suggest_borrow_on_unsized_slice(&obligation.cause.code, &mut err);
} else {
let (closure_span, found) = found_did
.and_then(|did| self.tcx.hir.get_if_local(did))
- .map(|node| self.get_fn_like_arguments(node))
- .unwrap_or((found_span.unwrap(), found));
+ .map(|node| {
+ let (found_span, found) = self.get_fn_like_arguments(node);
+ (Some(found_span), found)
+ }).unwrap_or((found_span, found));
self.report_arg_count_mismatch(span,
closure_span,
span,
node: hir::ImplItemKind::Method(hir::MethodSig { ref decl, .. }, _),
..
+ }) |
+ hir::map::NodeTraitItem(&hir::TraitItem {
+ span,
+ node: hir::TraitItemKind::Method(hir::MethodSig { ref decl, .. }, _),
+ ..
}) => {
(self.tcx.sess.codemap().def_span(span), decl.inputs.iter()
.map(|arg| match arg.clone().into_inner().node {
fn report_arg_count_mismatch(
&self,
span: Span,
- found_span: Span,
+ found_span: Option<Span>,
expected_args: Vec<ArgKind>,
found_args: Vec<ArgKind>,
is_closure: bool,
);
err.span_label(span, format!( "expected {} that takes {}", kind, expected_str));
- err.span_label(found_span, format!("takes {}", found_str));
-
- if let &[ArgKind::Tuple(_, ref fields)] = &found_args[..] {
- if fields.len() == expected_args.len() {
- let sugg = fields.iter()
- .map(|(name, _)| name.to_owned())
- .collect::<Vec<String>>().join(", ");
- err.span_suggestion(found_span,
- "change the closure to take multiple arguments instead of \
- a single tuple",
- format!("|{}|", sugg));
+
+ if let Some(found_span) = found_span {
+ err.span_label(found_span, format!("takes {}", found_str));
+
+ if let &[ArgKind::Tuple(_, ref fields)] = &found_args[..] {
+ if fields.len() == expected_args.len() {
+ let sugg = fields.iter()
+ .map(|(name, _)| name.to_owned())
+ .collect::<Vec<String>>().join(", ");
+ err.span_suggestion(found_span,
+ "change the closure to take multiple arguments instead of \
+ a single tuple",
+ format!("|{}|", sugg));
+ }
}
- }
- if let &[ArgKind::Tuple(_, ref fields)] = &expected_args[..] {
- if fields.len() == found_args.len() && is_closure {
- let sugg = format!(
- "|({}){}|",
- found_args.iter()
- .map(|arg| match arg {
- ArgKind::Arg(name, _) => name.to_owned(),
- _ => "_".to_owned(),
- })
- .collect::<Vec<String>>()
- .join(", "),
- // add type annotations if available
- if found_args.iter().any(|arg| match arg {
- ArgKind::Arg(_, ty) => ty != "_",
- _ => false,
- }) {
- format!(": ({})",
- fields.iter()
- .map(|(_, ty)| ty.to_owned())
- .collect::<Vec<String>>()
- .join(", "))
- } else {
- "".to_owned()
- },
- );
- err.span_suggestion(found_span,
- "change the closure to accept a tuple instead of individual \
- arguments",
- sugg);
+ if let &[ArgKind::Tuple(_, ref fields)] = &expected_args[..] {
+ if fields.len() == found_args.len() && is_closure {
+ let sugg = format!(
+ "|({}){}|",
+ found_args.iter()
+ .map(|arg| match arg {
+ ArgKind::Arg(name, _) => name.to_owned(),
+ _ => "_".to_owned(),
+ })
+ .collect::<Vec<String>>()
+ .join(", "),
+ // add type annotations if available
+ if found_args.iter().any(|arg| match arg {
+ ArgKind::Arg(_, ty) => ty != "_",
+ _ => false,
+ }) {
+ format!(": ({})",
+ fields.iter()
+ .map(|(_, ty)| ty.to_owned())
+ .collect::<Vec<String>>()
+ .join(", "))
+ } else {
+ "".to_owned()
+ },
+ );
+ err.span_suggestion(found_span,
+ "change the closure to accept a tuple instead of \
+ individual arguments",
+ sugg);
+ }
}
}
{
self.note_obligation_cause_code(err,
&obligation.predicate,
- &obligation.cause.code);
+ &obligation.cause.code,
+ &mut vec![]);
}
fn note_obligation_cause_code<T>(&self,
err: &mut DiagnosticBuilder,
predicate: &T,
- cause_code: &ObligationCauseCode<'tcx>)
+ cause_code: &ObligationCauseCode<'tcx>,
+ obligated_types: &mut Vec<&ty::TyS<'tcx>>)
where T: fmt::Display
{
let tcx = self.tcx;
err.note("the return type of a function must have a \
statically known size");
}
+ ObligationCauseCode::SizedYieldType => {
+ err.note("the yield type of a generator must have a \
+ statically known size");
+ }
ObligationCauseCode::AssignmentLhsSized => {
err.note("the left-hand-side of an assignment must have a statically known size");
}
}
ObligationCauseCode::BuiltinDerivedObligation(ref data) => {
let parent_trait_ref = self.resolve_type_vars_if_possible(&data.parent_trait_ref);
- err.note(&format!("required because it appears within the type `{}`",
- parent_trait_ref.0.self_ty()));
+ let ty = parent_trait_ref.0.self_ty();
+ err.note(&format!("required because it appears within the type `{}`", ty));
+ obligated_types.push(ty);
+
let parent_predicate = parent_trait_ref.to_predicate();
- self.note_obligation_cause_code(err,
- &parent_predicate,
- &data.parent_code);
+ if !self.is_recursive_obligation(obligated_types, &data.parent_code) {
+ self.note_obligation_cause_code(err,
+ &parent_predicate,
+ &data.parent_code,
+ obligated_types);
+ }
}
ObligationCauseCode::ImplDerivedObligation(ref data) => {
let parent_trait_ref = self.resolve_type_vars_if_possible(&data.parent_trait_ref);
parent_trait_ref.0.self_ty()));
let parent_predicate = parent_trait_ref.to_predicate();
self.note_obligation_cause_code(err,
- &parent_predicate,
- &data.parent_code);
+ &parent_predicate,
+ &data.parent_code,
+ obligated_types);
}
ObligationCauseCode::CompareImplMethodObligation { .. } => {
err.note(
err.help(&format!("consider adding a `#![recursion_limit=\"{}\"]` attribute to your crate",
suggested_limit));
}
+
+ fn is_recursive_obligation(&self,
+ obligated_types: &mut Vec<&ty::TyS<'tcx>>,
+ cause_code: &ObligationCauseCode<'tcx>) -> bool {
+ if let ObligationCauseCode::BuiltinDerivedObligation(ref data) = cause_code {
+ let parent_trait_ref = self.resolve_type_vars_if_possible(&data.parent_trait_ref);
+ for obligated_type in obligated_types {
+ if obligated_type == &parent_trait_ref.0.self_ty() {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
}
enum ArgKind {
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