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This commit is contained in:
JarredAllen 2020-08-02 21:46:18 -07:00
parent bb2c14e92b
commit 5e10b039a3
4 changed files with 7 additions and 33 deletions
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7
clippy_lints/src/loops.rs
View File

@ -27,7 +27,7 @@ use rustc_middle::middle::region;
use rustc_middle::ty::{self, Ty, TyS};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::source_map::Span;
use rustc_span::symbol::{Ident, Symbol};
use rustc_span::symbol::{sym, Ident, Symbol};
use rustc_typeck::expr_use_visitor::{ConsumeMode, Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
use std::iter::{once, Iterator};
use std::mem;
@ -2442,7 +2442,7 @@ fn check_needless_collect_indirect_usage<'tcx>(expr: &'tcx Expr<'_>, cx: &LateCo
if let Some(ref generic_args) = method_name.args;
if let Some(GenericArg::Type(ref ty)) = generic_args.args.get(0);
if let ty = cx.typeck_results().node_type(ty.hir_id);
if is_type_diagnostic_item(cx, ty, sym!(vec_type)) ||
if is_type_diagnostic_item(cx, ty, sym::vec_type) ||
is_type_diagnostic_item(cx, ty, sym!(vecdeque_type)) ||
match_type(cx, ty, &paths::LINKED_LIST);
if let Some(iter_calls) = detect_iter_and_into_iters(block, *ident);
@ -2524,12 +2524,11 @@ impl<'tcx> Visitor<'tcx> for IterFunctionVisitor {
if let &[name] = &path.segments;
if name.ident == self.target;
then {
let into_iter = sym!(into_iter);
let len = sym!(len);
let is_empty = sym!(is_empty);
let contains = sym!(contains);
match method_name.ident.name {
name if name == into_iter => self.uses.push(
sym::into_iter => self.uses.push(
IterFunction { func: IterFunctionKind::IntoIter, span: expr.span }
),
name if name == len => self.uses.push(

22
tests/ui/needless_collect_indirect.fixed
View File

@ -1,22 +0,0 @@
// run-rustfix
#[allow(unused)]
use std::collections::{HashMap, VecDeque};
fn main() {
let sample = [1; 5];
let indirect_iter = sample.iter().collect::<Vec<_>>();
indirect_iter.into_iter().map(|x| (x, x + 1)).collect::<HashMap<_, _>>();
let indirect_len = sample.iter().collect::<VecDeque<_>>();
indirect_len.len();
let indirect_empty = sample.iter().collect::<VecDeque<_>>();
indirect_empty.is_empty();
let indirect_contains = sample.iter().collect::<VecDeque<_>>();
indirect_contains.contains(&&5);
let indirect_negative = sample.iter().collect::<Vec<_>>();
indirect_negative.len();
indirect_negative
.into_iter()
.map(|x| (*x, *x + 1))
.collect::<HashMap<_, _>>();
}

3
tests/ui/needless_collect_indirect.rs
View File

@ -1,6 +1,3 @@
// run-rustfix
#[allow(unused)]
use std::collections::{HashMap, VecDeque};
fn main() {

8
tests/ui/needless_collect_indirect.stderr
View File

@ -1,5 +1,5 @@
error: avoid using `collect()` when not needed
--> $DIR/needless_collect_indirect.rs:8:5
--> $DIR/needless_collect_indirect.rs:5:5
|
LL | / let indirect_iter = sample.iter().collect::<Vec<_>>();
LL | | indirect_iter.into_iter().map(|x| (x, x + 1)).collect::<HashMap<_, _>>();
@ -13,7 +13,7 @@ LL | sample.iter().map(|x| (x, x + 1)).collect::<HashMap<_, _>>();
|
error: avoid using `collect()` when not needed
--> $DIR/needless_collect_indirect.rs:10:5
--> $DIR/needless_collect_indirect.rs:7:5
|
LL | / let indirect_len = sample.iter().collect::<VecDeque<_>>();
LL | | indirect_len.len();
@ -26,7 +26,7 @@ LL | sample.iter().count();
|
error: avoid using `collect()` when not needed
--> $DIR/needless_collect_indirect.rs:12:5
--> $DIR/needless_collect_indirect.rs:9:5
|
LL | / let indirect_empty = sample.iter().collect::<VecDeque<_>>();
LL | | indirect_empty.is_empty();
@ -39,7 +39,7 @@ LL | sample.iter().next().is_none();
|
error: avoid using `collect()` when not needed
--> $DIR/needless_collect_indirect.rs:14:5
--> $DIR/needless_collect_indirect.rs:11:5
|
LL | / let indirect_contains = sample.iter().collect::<VecDeque<_>>();
LL | | indirect_contains.contains(&&5);