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Add additional check on if arg type has iter method

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nahuakang 2021-02-03 09:39:35 +01:00
parent e07cd5b6fe
commit 0f5e71f8f2
1 changed files with 17 additions and 18 deletions
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35
clippy_lints/src/loops.rs
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@ -2041,25 +2041,24 @@ fn check_manual_flatten<'tcx>(
&mut applicability,
);
// Determine if `arg` is by reference, an `Iterator`, or implicitly adjusted with `into_iter`
let hint = match arg.kind {
ExprKind::AddrOf(_, _, arg_expr) => {
let arg_ty = cx.typeck_results().expr_ty(arg);
let hint = if arg_ty.is_ref() {
if has_iter_method(cx, arg_ty).is_none() {
return;
} else if let ExprKind::AddrOf(_, _, arg_expr) = arg.kind {
format!("{}.iter().flatten()", snippet(cx, arg_expr.span, ".."))
},
ExprKind::MethodCall(_, _, _, _) | ExprKind::Path(QPath::Resolved(None, _)) => {
// Determine if `arg` is `Iterator` or implicitly calls `into_iter`
let arg_ty = cx.typeck_results().expr_ty(arg);
if let Some(id) = get_trait_def_id(cx, &paths::ITERATOR) {
let is_iterator = implements_trait(cx, arg_ty, id, &[]);
if is_iterator {
format!("{}.flatten()", arg_snippet)
} else {
format!("{}.into_iter().flatten()", arg_snippet)
}
} else {
return
}
},
_ => return,
} else {
return;
}
} else if let Some(id) = get_trait_def_id(cx, &paths::ITERATOR) {
let is_iterator = implements_trait(cx, arg_ty, id, &[]);
if is_iterator {
format!("{}.flatten()", arg_snippet)
} else {
format!("{}.into_iter().flatten()", arg_snippet)
}
} else {
return
};
span_lint_and_sugg(