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Fix false positive on filter_next

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dswij 2021-08-13 14:36:40 +08:00
parent e9f56f949d
commit 91b598a8e4
1 changed files with 5 additions and 2 deletions
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7
clippy_lints/src/methods/filter_next.rs
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@ -1,6 +1,6 @@
use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg}; use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
use clippy_utils::is_trait_method;
use clippy_utils::source::snippet; use clippy_utils::source::snippet;
use clippy_utils::ty::implements_trait;
use rustc_errors::Applicability; use rustc_errors::Applicability;
use rustc_hir as hir; use rustc_hir as hir;
use rustc_lint::LateContext; use rustc_lint::LateContext;
@ -16,7 +16,10 @@ pub(super) fn check<'tcx>(
filter_arg: &'tcx hir::Expr<'_>, filter_arg: &'tcx hir::Expr<'_>,
) { ) {
// lint if caller of `.filter().next()` is an Iterator // lint if caller of `.filter().next()` is an Iterator
if is_trait_method(cx, expr, sym::Iterator) { let recv_impls_iterator = cx.tcx.get_diagnostic_item(sym::Iterator).map_or(false, |id| {
implements_trait(cx, cx.typeck_results().expr_ty(recv), id, &[])
});
if recv_impls_iterator {
let msg = "called `filter(..).next()` on an `Iterator`. This is more succinctly expressed by calling \ let msg = "called `filter(..).next()` on an `Iterator`. This is more succinctly expressed by calling \
`.find(..)` instead"; `.find(..)` instead";
let filter_snippet = snippet(cx, filter_arg.span, ".."); let filter_snippet = snippet(cx, filter_arg.span, "..");