2016-03-19 16:48:29 +00:00
|
|
|
//! Checks for usage of `&Vec[_]` and `&String`.
|
2015-05-04 05:17:15 +00:00
|
|
|
|
2018-05-30 08:15:50 +00:00
|
|
|
use crate::utils::ptr::get_spans;
|
2019-09-11 06:26:57 +00:00
|
|
|
use crate::utils::{
|
2020-05-28 13:45:24 +00:00
|
|
|
is_allowed, is_type_diagnostic_item, match_qpath, match_type, paths, snippet_opt, span_lint, span_lint_and_sugg,
|
2020-04-17 14:01:25 +00:00
|
|
|
span_lint_and_then, walk_ptrs_hir_ty,
|
2019-09-11 06:26:57 +00:00
|
|
|
};
|
2018-11-27 20:14:15 +00:00
|
|
|
use if_chain::if_chain;
|
2018-12-29 15:04:45 +00:00
|
|
|
use rustc_errors::Applicability;
|
2020-02-21 08:39:38 +00:00
|
|
|
use rustc_hir::{
|
|
|
|
BinOpKind, BodyId, Expr, ExprKind, FnDecl, FnRetTy, GenericArg, HirId, ImplItem, ImplItemKind, Item, ItemKind,
|
2020-03-16 15:00:16 +00:00
|
|
|
Lifetime, MutTy, Mutability, Node, PathSegment, QPath, TraitFn, TraitItem, TraitItemKind, Ty, TyKind,
|
2020-02-21 08:39:38 +00:00
|
|
|
};
|
2020-01-12 06:08:41 +00:00
|
|
|
use rustc_lint::{LateContext, LateLintPass};
|
2020-03-30 09:02:14 +00:00
|
|
|
use rustc_middle::ty;
|
2020-01-11 11:37:08 +00:00
|
|
|
use rustc_session::{declare_lint_pass, declare_tool_lint};
|
2020-01-04 10:00:00 +00:00
|
|
|
use rustc_span::source_map::Span;
|
2020-11-02 16:32:55 +00:00
|
|
|
use rustc_span::{sym, MultiSpan};
|
2018-11-27 20:14:15 +00:00
|
|
|
use std::borrow::Cow;
|
2015-05-04 05:17:15 +00:00
|
|
|
|
2018-03-28 13:24:26 +00:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 16:50:33 +00:00
|
|
|
/// **What it does:** This lint checks for function arguments of type `&String`
|
|
|
|
/// or `&Vec` unless the references are mutable. It will also suggest you
|
|
|
|
/// replace `.clone()` calls with the appropriate `.to_owned()`/`to_string()`
|
|
|
|
/// calls.
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** Requiring the argument to be of the specific size
|
|
|
|
/// makes the function less useful for no benefit; slices in the form of `&[T]`
|
|
|
|
/// or `&str` usually suffice and can be obtained from other types, too.
|
|
|
|
///
|
|
|
|
/// **Known problems:** The lint does not follow data. So if you have an
|
|
|
|
/// argument `x` and write `let y = x; y.clone()` the lint will not suggest
|
|
|
|
/// changing that `.clone()` to `.to_owned()`.
|
|
|
|
///
|
|
|
|
/// Other functions called from this function taking a `&String` or `&Vec`
|
|
|
|
/// argument may also fail to compile if you change the argument. Applying
|
|
|
|
/// this lint on them will fix the problem, but they may be in other crates.
|
|
|
|
///
|
2020-08-28 14:10:16 +00:00
|
|
|
/// One notable example of a function that may cause issues, and which cannot
|
|
|
|
/// easily be changed due to being in the standard library is `Vec::contains`.
|
|
|
|
/// when called on a `Vec<Vec<T>>`. If a `&Vec` is passed to that method then
|
|
|
|
/// it will compile, but if a `&[T]` is passed then it will not compile.
|
|
|
|
///
|
|
|
|
/// ```ignore
|
|
|
|
/// fn cannot_take_a_slice(v: &Vec<u8>) -> bool {
|
|
|
|
/// let vec_of_vecs: Vec<Vec<u8>> = some_other_fn();
|
|
|
|
///
|
|
|
|
/// vec_of_vecs.contains(v)
|
|
|
|
/// }
|
|
|
|
/// ```
|
|
|
|
///
|
2019-03-05 16:50:33 +00:00
|
|
|
/// Also there may be `fn(&Vec)`-typed references pointing to your function.
|
|
|
|
/// If you have them, you will get a compiler error after applying this lint's
|
|
|
|
/// suggestions. You then have the choice to undo your changes or change the
|
|
|
|
/// type of the reference.
|
|
|
|
///
|
|
|
|
/// Note that if the function is part of your public interface, there may be
|
2020-08-28 14:10:16 +00:00
|
|
|
/// other crates referencing it, of which you may not be aware. Carefully
|
|
|
|
/// deprecate the function before applying the lint suggestions in this case.
|
2019-03-05 16:50:33 +00:00
|
|
|
///
|
|
|
|
/// **Example:**
|
2019-03-05 22:23:50 +00:00
|
|
|
/// ```ignore
|
2020-06-09 14:36:01 +00:00
|
|
|
/// // Bad
|
2019-03-05 16:50:33 +00:00
|
|
|
/// fn foo(&Vec<u32>) { .. }
|
2020-06-09 14:36:01 +00:00
|
|
|
///
|
|
|
|
/// // Good
|
|
|
|
/// fn foo(&[u32]) { .. }
|
2019-03-05 16:50:33 +00:00
|
|
|
/// ```
|
2018-11-27 20:49:09 +00:00
|
|
|
pub PTR_ARG,
|
|
|
|
style,
|
|
|
|
"fn arguments of the type `&Vec<...>` or `&String`, suggesting to use `&[...]` or `&str` instead, respectively"
|
2015-05-04 05:17:15 +00:00
|
|
|
}
|
|
|
|
|
2018-03-28 13:24:26 +00:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 16:50:33 +00:00
|
|
|
/// **What it does:** This lint checks for equality comparisons with `ptr::null`
|
|
|
|
///
|
|
|
|
/// **Why is this bad?** It's easier and more readable to use the inherent
|
|
|
|
/// `.is_null()`
|
|
|
|
/// method instead
|
|
|
|
///
|
|
|
|
/// **Known problems:** None.
|
|
|
|
///
|
|
|
|
/// **Example:**
|
2019-03-05 22:23:50 +00:00
|
|
|
/// ```ignore
|
2020-06-09 14:36:01 +00:00
|
|
|
/// // Bad
|
2019-03-05 16:50:33 +00:00
|
|
|
/// if x == ptr::null {
|
|
|
|
/// ..
|
|
|
|
/// }
|
2020-06-09 14:36:01 +00:00
|
|
|
///
|
|
|
|
/// // Good
|
|
|
|
/// if x.is_null() {
|
|
|
|
/// ..
|
|
|
|
/// }
|
2019-03-05 16:50:33 +00:00
|
|
|
/// ```
|
2016-08-22 16:29:29 +00:00
|
|
|
pub CMP_NULL,
|
2018-03-28 13:24:26 +00:00
|
|
|
style,
|
2016-08-22 16:29:29 +00:00
|
|
|
"comparing a pointer to a null pointer, suggesting to use `.is_null()` instead."
|
|
|
|
}
|
|
|
|
|
2018-03-28 13:24:26 +00:00
|
|
|
declare_clippy_lint! {
|
2019-03-05 16:50:33 +00:00
|
|
|
/// **What it does:** This lint checks for functions that take immutable
|
2020-06-09 14:36:01 +00:00
|
|
|
/// references and return mutable ones.
|
2019-03-05 16:50:33 +00:00
|
|
|
///
|
|
|
|
/// **Why is this bad?** This is trivially unsound, as one can create two
|
2020-06-09 14:36:01 +00:00
|
|
|
/// mutable references from the same (immutable!) source.
|
|
|
|
/// This [error](https://github.com/rust-lang/rust/issues/39465)
|
2019-03-05 16:50:33 +00:00
|
|
|
/// actually lead to an interim Rust release 1.15.1.
|
|
|
|
///
|
|
|
|
/// **Known problems:** To be on the conservative side, if there's at least one
|
2020-06-09 14:36:01 +00:00
|
|
|
/// mutable reference with the output lifetime, this lint will not trigger.
|
|
|
|
/// In practice, this case is unlikely anyway.
|
2019-03-05 16:50:33 +00:00
|
|
|
///
|
|
|
|
/// **Example:**
|
2019-03-05 22:23:50 +00:00
|
|
|
/// ```ignore
|
2019-03-05 16:50:33 +00:00
|
|
|
/// fn foo(&Foo) -> &mut Bar { .. }
|
|
|
|
/// ```
|
2017-02-10 18:39:03 +00:00
|
|
|
pub MUT_FROM_REF,
|
2018-03-28 13:24:26 +00:00
|
|
|
correctness,
|
2017-02-10 18:39:03 +00:00
|
|
|
"fns that create mutable refs from immutable ref args"
|
|
|
|
}
|
2016-08-22 16:29:29 +00:00
|
|
|
|
2019-04-08 20:43:55 +00:00
|
|
|
declare_lint_pass!(Ptr => [PTR_ARG, CMP_NULL, MUT_FROM_REF]);
|
2015-05-04 05:17:15 +00:00
|
|
|
|
2020-06-25 20:41:36 +00:00
|
|
|
impl<'tcx> LateLintPass<'tcx> for Ptr {
|
|
|
|
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
|
2019-11-08 20:12:08 +00:00
|
|
|
if let ItemKind::Fn(ref sig, _, body_id) = item.kind {
|
|
|
|
check_fn(cx, &sig.decl, item.hir_id, Some(body_id));
|
2015-08-11 18:22:20 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-06-25 20:41:36 +00:00
|
|
|
fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'_>) {
|
2020-03-16 15:00:16 +00:00
|
|
|
if let ImplItemKind::Fn(ref sig, body_id) = item.kind {
|
2019-02-27 09:39:33 +00:00
|
|
|
let parent_item = cx.tcx.hir().get_parent_item(item.hir_id);
|
2019-06-25 21:34:07 +00:00
|
|
|
if let Some(Node::Item(it)) = cx.tcx.hir().find(parent_item) {
|
2020-01-18 05:14:36 +00:00
|
|
|
if let ItemKind::Impl { of_trait: Some(_), .. } = it.kind {
|
2015-10-30 23:48:05 +00:00
|
|
|
return; // ignore trait impls
|
|
|
|
}
|
|
|
|
}
|
2019-02-27 09:39:33 +00:00
|
|
|
check_fn(cx, &sig.decl, item.hir_id, Some(body_id));
|
2015-08-11 18:22:20 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-06-25 20:41:36 +00:00
|
|
|
fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
|
2020-03-12 19:56:55 +00:00
|
|
|
if let TraitItemKind::Fn(ref sig, ref trait_method) = item.kind {
|
2020-03-16 15:00:16 +00:00
|
|
|
let body_id = if let TraitFn::Provided(b) = *trait_method {
|
2017-11-04 19:55:56 +00:00
|
|
|
Some(b)
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
};
|
2019-02-27 09:39:33 +00:00
|
|
|
check_fn(cx, &sig.decl, item.hir_id, body_id);
|
2015-08-11 18:22:20 +00:00
|
|
|
}
|
|
|
|
}
|
2016-12-01 21:31:56 +00:00
|
|
|
|
2020-06-25 20:41:36 +00:00
|
|
|
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
|
2019-09-27 15:16:06 +00:00
|
|
|
if let ExprKind::Binary(ref op, ref l, ref r) = expr.kind {
|
2018-07-12 07:50:09 +00:00
|
|
|
if (op.node == BinOpKind::Eq || op.node == BinOpKind::Ne) && (is_null_path(l) || is_null_path(r)) {
|
2017-08-09 07:30:56 +00:00
|
|
|
span_lint(
|
|
|
|
cx,
|
|
|
|
CMP_NULL,
|
|
|
|
expr.span,
|
2020-08-11 13:43:21 +00:00
|
|
|
"comparing with null is better expressed by the `.is_null()` method",
|
2017-08-09 07:30:56 +00:00
|
|
|
);
|
2016-08-22 16:29:29 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2015-05-04 05:17:15 +00:00
|
|
|
}
|
|
|
|
|
2019-01-13 15:19:02 +00:00
|
|
|
#[allow(clippy::too_many_lines)]
|
2020-06-25 20:41:36 +00:00
|
|
|
fn check_fn(cx: &LateContext<'_>, decl: &FnDecl<'_>, fn_id: HirId, opt_body_id: Option<BodyId>) {
|
2019-07-06 03:52:51 +00:00
|
|
|
let fn_def_id = cx.tcx.hir().local_def_id(fn_id);
|
2017-06-29 13:38:25 +00:00
|
|
|
let sig = cx.tcx.fn_sig(fn_def_id);
|
2017-03-01 12:24:19 +00:00
|
|
|
let fn_ty = sig.skip_binder();
|
2020-05-28 13:45:24 +00:00
|
|
|
let body = opt_body_id.map(|id| cx.tcx.hir().body(id));
|
2016-03-01 19:38:21 +00:00
|
|
|
|
2017-09-16 07:10:26 +00:00
|
|
|
for (idx, (arg, ty)) in decl.inputs.iter().zip(fn_ty.inputs()).enumerate() {
|
2020-05-28 13:45:24 +00:00
|
|
|
// Honor the allow attribute on parameters. See issue 5644.
|
|
|
|
if let Some(body) = &body {
|
|
|
|
if is_allowed(cx, PTR_ARG, body.params[idx].hir_id) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-08-03 22:18:29 +00:00
|
|
|
if let ty::Ref(_, ty, Mutability::Not) = ty.kind() {
|
2020-11-02 16:32:55 +00:00
|
|
|
if is_type_diagnostic_item(cx, ty, sym::vec_type) {
|
2017-09-10 17:32:24 +00:00
|
|
|
let mut ty_snippet = None;
|
2017-10-23 19:18:02 +00:00
|
|
|
if_chain! {
|
2019-09-27 15:16:06 +00:00
|
|
|
if let TyKind::Path(QPath::Resolved(_, ref path)) = walk_ptrs_hir_ty(arg).kind;
|
2018-06-24 13:32:40 +00:00
|
|
|
if let Some(&PathSegment{args: Some(ref parameters), ..}) = path.segments.last();
|
2017-10-23 19:18:02 +00:00
|
|
|
then {
|
2018-06-24 21:42:52 +00:00
|
|
|
let types: Vec<_> = parameters.args.iter().filter_map(|arg| match arg {
|
|
|
|
GenericArg::Type(ty) => Some(ty),
|
|
|
|
_ => None,
|
|
|
|
}).collect();
|
|
|
|
if types.len() == 1 {
|
|
|
|
ty_snippet = snippet_opt(cx, types[0].span);
|
|
|
|
}
|
2017-10-23 19:18:02 +00:00
|
|
|
}
|
|
|
|
};
|
2019-05-17 21:53:54 +00:00
|
|
|
if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_owned()")]) {
|
2017-09-20 21:59:23 +00:00
|
|
|
span_lint_and_then(
|
|
|
|
cx,
|
|
|
|
PTR_ARG,
|
|
|
|
arg.span,
|
|
|
|
"writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used \
|
|
|
|
with non-Vec-based slices.",
|
2020-04-17 06:08:00 +00:00
|
|
|
|diag| {
|
2017-09-20 21:59:23 +00:00
|
|
|
if let Some(ref snippet) = ty_snippet {
|
2020-04-17 06:08:00 +00:00
|
|
|
diag.span_suggestion(
|
2018-11-27 20:14:15 +00:00
|
|
|
arg.span,
|
|
|
|
"change this to",
|
|
|
|
format!("&[{}]", snippet),
|
|
|
|
Applicability::Unspecified,
|
|
|
|
);
|
2017-09-20 21:59:23 +00:00
|
|
|
}
|
|
|
|
for (clonespan, suggestion) in spans {
|
2020-04-17 06:08:00 +00:00
|
|
|
diag.span_suggestion(
|
2017-11-04 19:55:56 +00:00
|
|
|
clonespan,
|
2018-11-27 20:14:15 +00:00
|
|
|
&snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
|
|
|
|
Cow::Owned(format!("change `{}` to", x))
|
|
|
|
}),
|
2017-11-04 19:55:56 +00:00
|
|
|
suggestion.into(),
|
2018-09-15 16:14:08 +00:00
|
|
|
Applicability::Unspecified,
|
2017-11-04 19:55:56 +00:00
|
|
|
);
|
2017-09-20 21:59:23 +00:00
|
|
|
}
|
2017-11-04 19:55:56 +00:00
|
|
|
},
|
2017-09-20 21:59:23 +00:00
|
|
|
);
|
|
|
|
}
|
2020-11-02 16:32:55 +00:00
|
|
|
} else if is_type_diagnostic_item(cx, ty, sym::string_type) {
|
2019-05-17 22:58:25 +00:00
|
|
|
if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_string()"), ("as_str", "")]) {
|
2017-09-20 21:59:23 +00:00
|
|
|
span_lint_and_then(
|
|
|
|
cx,
|
|
|
|
PTR_ARG,
|
|
|
|
arg.span,
|
|
|
|
"writing `&String` instead of `&str` involves a new object where a slice will do.",
|
2020-04-17 06:08:00 +00:00
|
|
|
|diag| {
|
|
|
|
diag.span_suggestion(arg.span, "change this to", "&str".into(), Applicability::Unspecified);
|
2017-09-20 21:59:23 +00:00
|
|
|
for (clonespan, suggestion) in spans {
|
2020-04-17 06:08:00 +00:00
|
|
|
diag.span_suggestion_short(
|
2017-11-04 19:55:56 +00:00
|
|
|
clonespan,
|
2018-11-27 20:14:15 +00:00
|
|
|
&snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
|
|
|
|
Cow::Owned(format!("change `{}` to", x))
|
|
|
|
}),
|
2017-11-04 19:55:56 +00:00
|
|
|
suggestion.into(),
|
2018-09-15 16:14:08 +00:00
|
|
|
Applicability::Unspecified,
|
2017-11-04 19:55:56 +00:00
|
|
|
);
|
2017-09-20 21:59:23 +00:00
|
|
|
}
|
2017-11-04 19:55:56 +00:00
|
|
|
},
|
2017-09-20 21:59:23 +00:00
|
|
|
);
|
|
|
|
}
|
2019-05-17 21:53:54 +00:00
|
|
|
} else if match_type(cx, ty, &paths::COW) {
|
2018-03-03 00:13:54 +00:00
|
|
|
if_chain! {
|
2019-09-27 15:16:06 +00:00
|
|
|
if let TyKind::Rptr(_, MutTy { ref ty, ..} ) = arg.kind;
|
|
|
|
if let TyKind::Path(ref path) = ty.kind;
|
2018-03-03 00:13:54 +00:00
|
|
|
if let QPath::Resolved(None, ref pp) = *path;
|
|
|
|
if let [ref bx] = *pp.segments;
|
2018-06-24 13:32:40 +00:00
|
|
|
if let Some(ref params) = bx.args;
|
2018-03-03 00:13:54 +00:00
|
|
|
if !params.parenthesized;
|
2018-06-25 00:06:57 +00:00
|
|
|
if let Some(inner) = params.args.iter().find_map(|arg| match arg {
|
|
|
|
GenericArg::Type(ty) => Some(ty),
|
2019-02-19 07:34:43 +00:00
|
|
|
_ => None,
|
2018-06-25 00:06:57 +00:00
|
|
|
});
|
2018-03-03 00:13:54 +00:00
|
|
|
then {
|
|
|
|
let replacement = snippet_opt(cx, inner.span);
|
2018-03-15 15:07:15 +00:00
|
|
|
if let Some(r) = replacement {
|
2020-04-17 14:01:25 +00:00
|
|
|
span_lint_and_sugg(
|
2018-03-15 15:07:15 +00:00
|
|
|
cx,
|
|
|
|
PTR_ARG,
|
|
|
|
arg.span,
|
|
|
|
"using a reference to `Cow` is not recommended.",
|
2020-04-17 14:01:25 +00:00
|
|
|
"change this to",
|
|
|
|
"&".to_owned() + &r,
|
|
|
|
Applicability::Unspecified,
|
2018-03-15 15:07:15 +00:00
|
|
|
);
|
2018-03-03 00:13:54 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2015-08-21 16:28:17 +00:00
|
|
|
}
|
2015-08-11 18:22:20 +00:00
|
|
|
}
|
|
|
|
}
|
2017-02-10 18:39:03 +00:00
|
|
|
|
2020-02-17 09:36:17 +00:00
|
|
|
if let FnRetTy::Return(ref ty) = decl.output {
|
2019-12-21 18:38:45 +00:00
|
|
|
if let Some((out, Mutability::Mut, _)) = get_rptr_lm(ty) {
|
2017-02-12 12:53:30 +00:00
|
|
|
let mut immutables = vec![];
|
2018-11-27 20:14:15 +00:00
|
|
|
for (_, ref mutbl, ref argspan) in decl
|
|
|
|
.inputs
|
2017-09-05 09:33:04 +00:00
|
|
|
.iter()
|
|
|
|
.filter_map(|ty| get_rptr_lm(ty))
|
|
|
|
.filter(|&(lt, _, _)| lt.name == out.name)
|
2017-08-09 07:30:56 +00:00
|
|
|
{
|
2019-12-21 18:38:45 +00:00
|
|
|
if *mutbl == Mutability::Mut {
|
2017-02-12 13:11:18 +00:00
|
|
|
return;
|
|
|
|
}
|
2017-02-12 12:53:30 +00:00
|
|
|
immutables.push(*argspan);
|
2017-02-10 18:39:03 +00:00
|
|
|
}
|
2017-02-12 13:11:18 +00:00
|
|
|
if immutables.is_empty() {
|
|
|
|
return;
|
|
|
|
}
|
2018-11-27 20:14:15 +00:00
|
|
|
span_lint_and_then(
|
|
|
|
cx,
|
|
|
|
MUT_FROM_REF,
|
|
|
|
ty.span,
|
|
|
|
"mutable borrow from immutable input(s)",
|
2020-04-17 06:08:00 +00:00
|
|
|
|diag| {
|
2018-11-27 20:14:15 +00:00
|
|
|
let ms = MultiSpan::from_spans(immutables);
|
2020-04-17 06:08:00 +00:00
|
|
|
diag.span_note(ms, "immutable borrow here");
|
2018-11-27 20:14:15 +00:00
|
|
|
},
|
|
|
|
);
|
2017-02-10 18:39:03 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-12-30 04:02:10 +00:00
|
|
|
fn get_rptr_lm<'tcx>(ty: &'tcx Ty<'tcx>) -> Option<(&'tcx Lifetime, Mutability, Span)> {
|
2019-09-27 15:16:06 +00:00
|
|
|
if let TyKind::Rptr(ref lt, ref m) = ty.kind {
|
2017-02-12 12:53:30 +00:00
|
|
|
Some((lt, m.mutbl, ty.span))
|
2017-02-10 23:32:12 +00:00
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
2015-05-04 05:17:15 +00:00
|
|
|
}
|
2016-08-22 16:29:29 +00:00
|
|
|
|
2019-12-27 07:12:26 +00:00
|
|
|
fn is_null_path(expr: &Expr<'_>) -> bool {
|
2019-09-27 15:16:06 +00:00
|
|
|
if let ExprKind::Call(ref pathexp, ref args) = expr.kind {
|
2016-08-22 16:29:29 +00:00
|
|
|
if args.is_empty() {
|
2019-09-27 15:16:06 +00:00
|
|
|
if let ExprKind::Path(ref path) = pathexp.kind {
|
2019-05-17 21:53:54 +00:00
|
|
|
return match_qpath(path, &paths::PTR_NULL) || match_qpath(path, &paths::PTR_NULL_MUT);
|
2016-08-22 16:29:29 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
false
|
|
|
|
}
|