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Add some notes about MethodCall cases

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This commit is contained in:
ThibsG
2021-10-01 17:29:37 +02:00
parent 268ef407a6
commit abaaf744fd
1 changed files with 10 additions and 4 deletions
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14
clippy_lints/src/methods/search_is_some.rs
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@@ -221,7 +221,7 @@ struct DerefDelegate<'a, 'tcx> {
impl DerefDelegate<'_, 'tcx> {
pub fn finish(&mut self) -> String {
let end_span = Span::new(self.next_pos, self.closure_span.hi(), self.closure_span.ctxt());
let end_span = Span::new(self.next_pos, self.closure_span.hi(), self.closure_span.ctxt(), None);
let end_snip = snippet_with_applicability(self.cx, end_span, "..", &mut self.applicability);
format!("{}{}", self.suggestion_start, end_snip)
}
@@ -255,7 +255,7 @@ impl<'tcx> Delegate<'tcx> for DerefDelegate<'_, 'tcx> {
let map = self.cx.tcx.hir();
let ident_str = map.name(id).to_string();
let span = map.span(cmt.hir_id);
let start_span = Span::new(self.next_pos, span.lo(), span.ctxt());
let start_span = Span::new(self.next_pos, span.lo(), span.ctxt(), None);
let mut start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
if cmt.place.projections.is_empty() {
@@ -263,8 +263,14 @@ impl<'tcx> Delegate<'tcx> for DerefDelegate<'_, 'tcx> {
// i.e.: suggest `&x` instead of `x`
self.suggestion_start.push_str(&format!("{}&{}", start_snip, ident_str));
} else {
// cases where a parent call is using the item
// cases where a parent `Call` or `MethodCall` is using the item
// i.e.: suggest `.contains(&x)` for `.find(|x| [1, 2, 3].contains(x)).is_none()`
//
// Note about method calls:
// - compiler automatically dereference references if the target type is a reference (works also for
// function call)
// - `self` arguments in the case of `x.is_something()` are also automatically (de)referenced, and
// no projection should be suggested
if let Some(parent_expr) = get_parent_expr_for_hir(self.cx, cmt.hir_id) {
if let ExprKind::Call(_, call_args) | ExprKind::MethodCall(_, _, call_args, _) = parent_expr.kind {
let expr = self.cx.tcx.hir().expect_expr(cmt.hir_id);
@@ -316,7 +322,7 @@ impl<'tcx> Delegate<'tcx> for DerefDelegate<'_, 'tcx> {
// so the span is set-up again to get more code, using `span.hi()` (i.e.: `foo[x]`)
// instead of `span.lo()` (i.e.: `foo`)
ProjectionKind::Index => {
let start_span = Span::new(self.next_pos, span.hi(), span.ctxt());
let start_span = Span::new(self.next_pos, span.hi(), span.ctxt(), None);
start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
replacement_str.clear();
projections_handled = true;