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Auto merge of #3557 - detrumi:allow_asref_adjustments, r=oli-obk

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Fix false positive in useless_asref

Fixes #3480
This commit is contained in:
bors 2018-12-18 08:37:44 +00:00
commit a637d55329
2 changed files with 39 additions and 7 deletions
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24
clippy_lints/src/methods/mod.rs
View File

@ -19,11 +19,11 @@ use crate::syntax::symbol::LocalInternedString;
use crate::utils::paths;
use crate::utils::sugg;
use crate::utils::{
get_arg_name, get_trait_def_id, implements_trait, in_macro, is_copy, is_expn_of, is_self, is_self_ty,
iter_input_pats, last_path_segment, match_def_path, match_path, match_qpath, match_trait_method, match_type,
match_var, method_calls, method_chain_args, remove_blocks, return_ty, same_tys, single_segment_path, snippet,
snippet_with_applicability, snippet_with_macro_callsite, span_lint, span_lint_and_sugg, span_lint_and_then,
span_note_and_lint, walk_ptrs_ty, walk_ptrs_ty_depth, SpanlessEq,
get_arg_name, get_parent_expr, get_trait_def_id, implements_trait, in_macro, is_copy, is_expn_of, is_self,
is_self_ty, iter_input_pats, last_path_segment, match_def_path, match_path, match_qpath, match_trait_method,
match_type, match_var, method_calls, method_chain_args, remove_blocks, return_ty, same_tys, single_segment_path,
snippet, snippet_with_applicability, snippet_with_macro_callsite, span_lint, span_lint_and_sugg,
span_lint_and_then, span_note_and_lint, walk_ptrs_ty, walk_ptrs_ty_depth, SpanlessEq,
};
use if_chain::if_chain;
use matches::matches;
@ -859,8 +859,8 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
["nth", "iter_mut"] => lint_iter_nth(cx, expr, arg_lists[1], true),
["next", "skip"] => lint_iter_skip_next(cx, expr),
["collect", "cloned"] => lint_iter_cloned_collect(cx, expr, arg_lists[1]),
["as_ref", ..] => lint_asref(cx, expr, "as_ref", arg_lists[0]),
["as_mut", ..] => lint_asref(cx, expr, "as_mut", arg_lists[0]),
["as_ref"] => lint_asref(cx, expr, "as_ref", arg_lists[0]),
["as_mut"] => lint_asref(cx, expr, "as_mut", arg_lists[0]),
["fold", ..] => lint_unnecessary_fold(cx, expr, arg_lists[0]),
["filter_map", ..] => unnecessary_filter_map::lint(cx, expr, arg_lists[0]),
_ => {},
@ -2181,6 +2181,16 @@ fn lint_asref(cx: &LateContext<'_, '_>, expr: &hir::Expr, call_name: &str, as_re
let (base_res_ty, res_depth) = walk_ptrs_ty_depth(res_ty);
let (base_rcv_ty, rcv_depth) = walk_ptrs_ty_depth(rcv_ty);
if base_rcv_ty == base_res_ty && rcv_depth >= res_depth {
// allow the `as_ref` or `as_mut` if it is followed by another method call
if_chain! {
if let Some(parent) = get_parent_expr(cx, expr);
if let hir::ExprKind::MethodCall(_, ref span, _) = parent.node;
if span != &expr.span;
then {
return;
}
}
let mut applicability = Applicability::MachineApplicable;
span_lint_and_sugg(
cx,

22
tests/ui/useful_asref.rs Normal file
View File

@ -0,0 +1,22 @@
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![deny(clippy::useless_asref)]
trait Trait {
fn as_ptr(&self);
}
impl<'a> Trait for &'a [u8] {
fn as_ptr(&self) {
self.as_ref().as_ptr();
}
}
fn main() {}