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Auto merge of #7140 - matthiaskrgr:ice_std, r=llogiq

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fix ice when checking rustc libstd

```
thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', src/tools/clippy/clippy_lints/src/matches.rs:1595:53
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

I don't have a minimised testcase because I don't have time to reduce libstd down to a few lines right now.

---
changelog: fix index out of bounds access when checking rustc libstd
This commit is contained in:
bors 2021-04-27 23:39:41 +00:00
commit ce37099bd3
1 changed files with 2 additions and 2 deletions
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4
clippy_lints/src/matches.rs
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@ -1590,9 +1590,9 @@ fn is_none_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
// Checks if arm has the form `Some(ref v) => Some(v)` (checks for `ref` and `ref mut`)
fn is_ref_some_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> Option<BindingAnnotation> {
if_chain! {
if let PatKind::TupleStruct(ref qpath, pats, _) = arm.pat.kind;
if let PatKind::TupleStruct(ref qpath, [first_pat, ..], _) = arm.pat.kind;
if is_lang_ctor(cx, qpath, OptionSome);
if let PatKind::Binding(rb, .., ident, _) = pats[0].kind;
if let PatKind::Binding(rb, .., ident, _) = first_pat.kind;
if rb == BindingAnnotation::Ref || rb == BindingAnnotation::RefMut;
if let ExprKind::Call(e, args) = remove_blocks(arm.body).kind;
if let ExprKind::Path(ref some_path) = e.kind;