src/tools/clippy/clippy_lints/src/methods/inspect_for_each.rs

use clippy_utils::diagnostics::span_lint_and_help;
use clippy_utils::is_trait_method;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_span::{sym, Span};

use super::INSPECT_FOR_EACH;

/// lint use of `inspect().for_each()` for `Iterators`
pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>, inspect_span: Span) {
    if is_trait_method(cx, expr, sym::Iterator) {
        let msg = "called `inspect(..).for_each(..)` on an `Iterator`";
        let hint = "move the code from `inspect(..)` to `for_each(..)` and remove the `inspect(..)`";
        span_lint_and_help(
            cx,
            INSPECT_FOR_EACH,
            inspect_span.with_hi(expr.span.hi()),
            msg,
            None,
            hint,
        );
    }
}