1 use clippy_utils::diagnostics::span_lint_and_sugg;
2 use clippy_utils::source::snippet_with_applicability;
3 use clippy_utils::{method_chain_args, path_def_id};
4 use if_chain::if_chain;
5 use rustc_errors::Applicability;
7 use rustc_lint::LateContext;
9 use rustc_middle::ty::{self, DefIdTree};
11 /// Wrapper fn for `CHARS_NEXT_CMP` and `CHARS_LAST_CMP` lints.
14 info: &crate::methods::BinaryExprInfo<'_>,
15 chain_methods: &[&str],
20 if let Some(args) = method_chain_args(info.chain, chain_methods);
21 if let hir::ExprKind::Call(fun, [arg_char]) = info.other.kind;
22 if let Some(id) = path_def_id(cx, fun).map(|ctor_id| cx.tcx.parent(ctor_id));
23 if Some(id) == cx.tcx.lang_items().option_some_variant();
25 let mut applicability = Applicability::MachineApplicable;
26 let self_ty = cx.typeck_results().expr_ty_adjusted(args[0].0).peel_refs();
28 if *self_ty.kind() != ty::Str {
36 &format!("you should use the `{}` method", suggest),
38 format!("{}{}.{}({})",
39 if info.eq { "" } else { "!" },
40 snippet_with_applicability(cx, args[0].0.span, "..", &mut applicability),
42 snippet_with_applicability(cx, arg_char.span, "..", &mut applicability)),