rust-clippy/clippy_lints/src/loops/iter_next_loop.rs

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use super::ITER_NEXT_LOOP;
use crate::utils::{match_trait_method, paths, span_lint};
use rustc_hir::Expr;
use rustc_lint::LateContext;
pub(super) fn check(cx: &LateContext<'_>, arg: &Expr<'_>, expr: &Expr<'_>) -> bool {
if match_trait_method(cx, arg, &paths::ITERATOR) {
span_lint(
cx,
ITER_NEXT_LOOP,
expr.span,
"you are iterating over `Iterator::next()` which is an Option; this will compile but is \
probably not what you want",
);
true
} else {
false
}
}