+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{path_to_local_id, peel_blocks, strip_pat_refs};
+use rustc_errors::Applicability;
+use rustc_hir::{ExprKind, Local, MatchSource, PatKind, QPath};
+use rustc_lint::LateContext;
+
+use super::INFALLIBLE_DESTRUCTURING_MATCH;
+
+pub(crate) fn check(cx: &LateContext<'_>, local: &Local<'_>) -> bool {
+ if_chain! {
+ if !local.span.from_expansion();
+ if let Some(expr) = local.init;
+ if let ExprKind::Match(target, arms, MatchSource::Normal) = expr.kind;
+ if arms.len() == 1 && arms[0].guard.is_none();
+ if let PatKind::TupleStruct(
+ QPath::Resolved(None, variant_name), args, _) = arms[0].pat.kind;
+ if args.len() == 1;
+ if let PatKind::Binding(_, arg, ..) = strip_pat_refs(&args[0]).kind;
+ let body = peel_blocks(arms[0].body);
+ if path_to_local_id(body, arg);
+
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ INFALLIBLE_DESTRUCTURING_MATCH,
+ local.span,
+ "you seem to be trying to use `match` to destructure a single infallible pattern. \
+ Consider using `let`",
+ "try this",
+ format!(
+ "let {}({}) = {};",
+ snippet_with_applicability(cx, variant_name.span, "..", &mut applicability),
+ snippet_with_applicability(cx, local.pat.span, "..", &mut applicability),
+ snippet_with_applicability(cx, target.span, "..", &mut applicability),
+ ),
+ applicability,
+ );
+ return true;
+ }
+ }
+ false
+}