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Manage macros case + move to MaybeIncorrect when binding values

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ThibsG 2020-02-04 20:19:20 +01:00
parent 53094de08e
commit 00904cb100
1 changed files with 18 additions and 18 deletions
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32
clippy_lints/src/matches.rs
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@ -285,7 +285,8 @@ declare_clippy_lint! {
///
/// **Why is this bad?** Readability and needless complexity.
///
/// **Known problems:** None.
/// **Known problems:** Suggested replacements may be incorrect when `match`
/// is actually binding temporary value, bringing a 'dropped while borrowed' error.
///
/// **Example:**
/// ```rust
@ -835,23 +836,22 @@ fn check_match_single_binding(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[A
};
// Do we need to add ';' to suggestion ?
if_chain! {
if let ExprKind::Block(block, _) = &arms[0].body.kind;
if block.stmts.len() == 1;
if let StmtKind::Semi(s) = block.stmts.get(0).unwrap().kind;
then {
match s.kind {
ExprKind::Block(_, _) => (),
_ => {
// expr_ty(body) == ()
if cx.tables.expr_ty(&arms[0].body).is_unit() {
match match_body.kind {
ExprKind::Block(block, _) => {
// macro + expr_ty(body) == ()
if block.span.from_expansion() && cx.tables.expr_ty(&match_body).is_unit() {
snippet_body.push(';');
}
},
_ => {
// expr_ty(body) == ()
if cx.tables.expr_ty(&match_body).is_unit() {
snippet_body.push(';');
}
}
}
},
}
let mut applicability = Applicability::MaybeIncorrect;
match arms[0].pat.kind {
PatKind::Binding(..) | PatKind::Tuple(_, _) | PatKind::Struct(..) => {
span_lint_and_sugg(
@ -862,11 +862,11 @@ fn check_match_single_binding(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[A
"consider using `let` statement",
format!(
"let {} = {};\n{}",
snippet(cx, bind_names, ".."),
snippet(cx, matched_vars, ".."),
snippet_with_applicability(cx, bind_names, "..", &mut applicability),
snippet_with_applicability(cx, matched_vars, "..", &mut applicability),
snippet_body
),
Applicability::MachineApplicable,
applicability,
);
},
PatKind::Wild => {