1 use clippy_utils::diagnostics::span_lint_and_help;
2 use clippy_utils::is_in_test_function;
3 use clippy_utils::ty::is_type_diagnostic_item;
5 use rustc_lint::LateContext;
8 use super::UNWRAP_USED;
10 /// lint use of `unwrap()` for `Option`s and `Result`s
11 pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>, allow_unwrap_in_tests: bool) {
12 let obj_ty = cx.typeck_results().expr_ty(recv).peel_refs();
14 let mess = if is_type_diagnostic_item(cx, obj_ty, sym::Option) {
15 Some((UNWRAP_USED, "an Option", "None"))
16 } else if is_type_diagnostic_item(cx, obj_ty, sym::Result) {
17 Some((UNWRAP_USED, "a Result", "Err"))
22 if allow_unwrap_in_tests && is_in_test_function(cx.tcx, expr.hir_id) {
26 if let Some((lint, kind, none_value)) = mess {
31 &format!("used `unwrap()` on `{}` value", kind,),
34 "if you don't want to handle the `{}` case gracefully, consider \
35 using `expect()` to provide a better panic message",