}
fn visit_where_predicate(&mut self, p: &'a ast::WherePredicate) {
- use rustc_ast::{WhereBoundPredicate, WherePredicate};
- if let WherePredicate::BoundPredicate(WhereBoundPredicate { bounded_ty, .. }) = p &&
- let ast::TyKind::BareFn(b) = &bounded_ty.kind &&
- b.generic_params.len() > 0 {
- return;
- }
+ lint_callback!(self, enter_where_predicate, p);
ast_visit::walk_where_predicate(self, p);
+ lint_callback!(self, exit_where_predicate, p);
}
fn visit_poly_trait_ref(&mut self, t: &'a ast::PolyTraitRef) {
"`if`, `match`, `while` and `return` do not need parentheses"
}
-declare_lint_pass!(UnusedParens => [UNUSED_PARENS]);
+pub struct UnusedParens {
+ with_self_ty_parens: bool,
+}
+
+impl UnusedParens {
+ pub fn new() -> Self {
+ Self { with_self_ty_parens: false }
+ }
+}
+
+impl_lint_pass!(UnusedParens => [UNUSED_PARENS]);
impl UnusedDelimLint for UnusedParens {
const DELIM_STR: &'static str = "parentheses";
}
fn check_ty(&mut self, cx: &EarlyContext<'_>, ty: &ast::Ty) {
+ if let ast::TyKind::Array(_, len) = &ty.kind {
+ self.check_unused_delims_expr(
+ cx,
+ &len.value,
+ UnusedDelimsCtx::ArrayLenExpr,
+ false,
+ None,
+ None,
+ );
+ }
if let ast::TyKind::Paren(r) = &ty.kind {
match &r.kind {
ast::TyKind::TraitObject(..) => {}
+ ast::TyKind::BareFn(b)
+ if self.with_self_ty_parens && b.generic_params.len() > 0 => {}
ast::TyKind::ImplTrait(_, bounds) if bounds.len() > 1 => {}
- ast::TyKind::Array(_, len) => {
- self.check_unused_delims_expr(
- cx,
- &len.value,
- UnusedDelimsCtx::ArrayLenExpr,
- false,
- None,
- None,
- );
- }
_ => {
let spans = if let Some(r) = r.span.find_ancestor_inside(ty.span) {
Some((ty.span.with_hi(r.lo()), ty.span.with_lo(r.hi())))
fn check_item(&mut self, cx: &EarlyContext<'_>, item: &ast::Item) {
<Self as UnusedDelimLint>::check_item(self, cx, item)
}
+
+ fn enter_where_predicate(&mut self, _: &EarlyContext<'_>, pred: &ast::WherePredicate) {
+ use rustc_ast::{WhereBoundPredicate, WherePredicate};
+ if let WherePredicate::BoundPredicate(WhereBoundPredicate {
+ bounded_ty,
+ bound_generic_params,
+ ..
+ }) = pred &&
+ let ast::TyKind::Paren(_) = &bounded_ty.kind &&
+ bound_generic_params.is_empty() {
+ self.with_self_ty_parens = true;
+ }
+ }
+
+ fn exit_where_predicate(&mut self, _: &EarlyContext<'_>, _: &ast::WherePredicate) {
+ self.with_self_ty_parens = false;
+ }
}
declare_lint! {
static_assert!(align_of::<SimpleMessage>() >= TAG_MASK + 1);
static_assert!(align_of::<Custom>() >= TAG_MASK + 1);
-static_assert!(@usize_eq: (TAG_MASK & TAG_SIMPLE_MESSAGE), TAG_SIMPLE_MESSAGE);
-static_assert!(@usize_eq: (TAG_MASK & TAG_CUSTOM), TAG_CUSTOM);
-static_assert!(@usize_eq: (TAG_MASK & TAG_OS), TAG_OS);
-static_assert!(@usize_eq: (TAG_MASK & TAG_SIMPLE), TAG_SIMPLE);
+static_assert!(@usize_eq: TAG_MASK & TAG_SIMPLE_MESSAGE, TAG_SIMPLE_MESSAGE);
+static_assert!(@usize_eq: TAG_MASK & TAG_CUSTOM, TAG_CUSTOM);
+static_assert!(@usize_eq: TAG_MASK & TAG_OS, TAG_OS);
+static_assert!(@usize_eq: TAG_MASK & TAG_SIMPLE, TAG_SIMPLE);
// This is obviously true (`TAG_CUSTOM` is `0b01`), but in `Repr::new_custom` we
// offset a pointer by this value, and expect it to both be within the same