1 use clippy_utils::consts::{constant_context, Constant};
2 use clippy_utils::diagnostics::span_lint_and_sugg;
3 use clippy_utils::source::snippet;
4 use clippy_utils::ty::is_type_lang_item;
5 use rustc_errors::Applicability;
6 use rustc_hir::{Expr, LangItem};
7 use rustc_lint::LateContext;
9 use super::REPEAT_ONCE;
11 pub(super) fn check<'tcx>(
12 cx: &LateContext<'tcx>,
15 repeat_arg: &'tcx Expr<'_>,
17 if constant_context(cx, cx.typeck_results()).expr(repeat_arg) == Some(Constant::Int(1)) {
18 let ty = cx.typeck_results().expr_ty(recv).peel_refs();
24 "calling `repeat(1)` on str",
25 "consider using `.to_string()` instead",
26 format!("{}.to_string()", snippet(cx, recv.span, r#""...""#)),
27 Applicability::MachineApplicable,
29 } else if ty.builtin_index().is_some() {
34 "calling `repeat(1)` on slice",
35 "consider using `.to_vec()` instead",
36 format!("{}.to_vec()", snippet(cx, recv.span, r#""...""#)),
37 Applicability::MachineApplicable,
39 } else if is_type_lang_item(cx, ty, LangItem::String) {
44 "calling `repeat(1)` on a string literal",
45 "consider using `.clone()` instead",
46 format!("{}.clone()", snippet(cx, recv.span, r#""...""#)),
47 Applicability::MachineApplicable,