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Merge pull request #603 from mcarton/copies

Browse Source 
Die copy & paste, die
This commit is contained in:
llogiq 2016-02-07 14:48:13 +01:00
commit 2c212dc301
12 changed files with 443 additions and 23 deletions
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4
README.md
View File

@ -6,7 +6,7 @@ A collection of lints to catch common mistakes and improve your Rust code.
[Jump to usage instructions](#usage)
##Lints
There are 114 lints included in this crate:
There are 116 lints included in this crate:
name | default | meaning
---------------------------------------------------------------------------------------------------------------|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
@ -47,6 +47,8 @@ name
[for_loop_over_option](https://github.com/Manishearth/rust-clippy/wiki#for_loop_over_option) | warn | for-looping over an `Option`, which is more clearly expressed as an `if let`
[for_loop_over_result](https://github.com/Manishearth/rust-clippy/wiki#for_loop_over_result) | warn | for-looping over a `Result`, which is more clearly expressed as an `if let`
[identity_op](https://github.com/Manishearth/rust-clippy/wiki#identity_op) | warn | using identity operations, e.g. `x + 0` or `y / 1`
[if_same_then_else](https://github.com/Manishearth/rust-clippy/wiki#if_same_then_else) | warn | if with the same *then* and *else* blocks
[ifs_same_cond](https://github.com/Manishearth/rust-clippy/wiki#ifs_same_cond) | warn | consecutive `ifs` with the same condition
[ineffective_bit_mask](https://github.com/Manishearth/rust-clippy/wiki#ineffective_bit_mask) | warn | expressions where a bit mask will be rendered useless by a comparison, e.g. `(x | 1) > 2`
[inline_always](https://github.com/Manishearth/rust-clippy/wiki#inline_always) | warn | `#[inline(always)]` is a bad idea in most cases
[invalid_regex](https://github.com/Manishearth/rust-clippy/wiki#invalid_regex) | deny | finds invalid regular expressions in `Regex::new(_)` invocations

102
src/copies.rs Normal file
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@ -0,0 +1,102 @@
use rustc::lint::*;
use rustc_front::hir::*;
use utils::{get_parent_expr, in_macro, is_block_equal, is_exp_equal, span_lint, span_note_and_lint};
/// **What it does:** This lint checks for consecutive `ifs` with the same condition. This lint is
/// `Warn` by default.
///
/// **Why is this bad?** This is probably a copy & paste error.
///
/// **Known problems:** Hopefully none.
///
/// **Example:** `if a == b { .. } else if a == b { .. }`
declare_lint! {
pub IFS_SAME_COND,
Warn,
"consecutive `ifs` with the same condition"
}
/// **What it does:** This lint checks for `if/else` with the same body as the *then* part and the
/// *else* part. This lint is `Warn` by default.
///
/// **Why is this bad?** This is probably a copy & paste error.
///
/// **Known problems:** Hopefully none.
///
/// **Example:** `if .. { 42 } else { 42 }`
declare_lint! {
pub IF_SAME_THEN_ELSE,
Warn,
"if with the same *then* and *else* blocks"
}
#[derive(Copy, Clone, Debug)]
pub struct CopyAndPaste;
impl LintPass for CopyAndPaste {
fn get_lints(&self) -> LintArray {
lint_array![
IFS_SAME_COND,
IF_SAME_THEN_ELSE
]
}
}
impl LateLintPass for CopyAndPaste {
fn check_expr(&mut self, cx: &LateContext, expr: &Expr) {
if !in_macro(cx, expr.span) {
lint_same_then_else(cx, expr);
lint_same_cond(cx, expr);
}
}
}
/// Implementation of `IF_SAME_THEN_ELSE`.
fn lint_same_then_else(cx: &LateContext, expr: &Expr) {
if let ExprIf(_, ref then_block, Some(ref else_expr)) = expr.node {
if let ExprBlock(ref else_block) = else_expr.node {
if is_block_equal(cx, &then_block, &else_block, false) {
span_lint(cx, IF_SAME_THEN_ELSE, expr.span, "this if has the same then and else blocks");
}
}
}
}
/// Implementation of `IFS_SAME_COND`.
fn lint_same_cond(cx: &LateContext, expr: &Expr) {
// skip ifs directly in else, it will be checked in the parent if
if let Some(&Expr{node: ExprIf(_, _, Some(ref else_expr)), ..}) = get_parent_expr(cx, expr) {
if else_expr.id == expr.id {
return;
}
}
let conds = condition_sequence(expr);
for (n, i) in conds.iter().enumerate() {
for j in conds.iter().skip(n+1) {
if is_exp_equal(cx, i, j, true) {
span_note_and_lint(cx, IFS_SAME_COND, j.span, "this if has the same condition as a previous if", i.span, "same as this");
}
}
}
}
/// Return the list of condition expressions in a sequence of `if/else`.
/// Eg. would return `[a, b]` for the expression `if a {..} else if b {..}`.
fn condition_sequence(mut expr: &Expr) -> Vec<&Expr> {
let mut result = vec![];
while let ExprIf(ref cond, _, ref else_expr) = expr.node {
result.push(&**cond);
if let Some(ref else_expr) = *else_expr {
expr = else_expr;
}
else {
break;
}
}
result
}

2
src/entry.rs
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@ -89,7 +89,7 @@ fn check_for_insert(cx: &LateContext, span: Span, map: &Expr, key: &Expr, expr:
params.len() == 3,
name.node.as_str() == "insert",
get_item_name(cx, map) == get_item_name(cx, &*params[0]),
is_exp_equal(cx, key, &params[1])
is_exp_equal(cx, key, &params[1], false)
], {
let help = if sole_expr {
format!("{}.entry({}).or_insert({})",

14
src/eq_op.rs
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@ -4,9 +4,11 @@ use rustc_front::util as ast_util;
use utils::{is_exp_equal, span_lint};
/// **What it does:** This lint checks for equal operands to comparisons and bitwise binary operators (`&`, `|` and `^`).
/// **What it does:** This lint checks for equal operands to comparison, logical and bitwise,
/// difference and division binary operators (`==`, `>`, etc., `&&`, `||`, `&`, `|`, `^`, `-` and
/// `/`).
///
/// **Why is this bad?** This is usually just a typo.
/// **Why is this bad?** This is usually just a typo or a copy and paste error.
///
/// **Known problems:** False negatives: We had some false positives regarding calls (notably [racer](https://github.com/phildawes/racer) had one instance of `x.pop() && x.pop()`), so we removed matching any function or method calls. We may introduce a whitelist of known pure functions in the future.
///
@ -29,19 +31,21 @@ impl LintPass for EqOp {
impl LateLintPass for EqOp {
fn check_expr(&mut self, cx: &LateContext, e: &Expr) {
if let ExprBinary(ref op, ref left, ref right) = e.node {
if is_cmp_or_bit(op) && is_exp_equal(cx, left, right) {
if is_valid_operator(op) && is_exp_equal(cx, left, right, true) {
span_lint(cx,
EQ_OP,
e.span,
&format!("equal expressions as operands to {}", ast_util::binop_to_string(op.node)));
&format!("equal expressions as operands to `{}`", ast_util::binop_to_string(op.node)));
}
}
}
}
fn is_cmp_or_bit(op: &BinOp) -> bool {
fn is_valid_operator(op: &BinOp) -> bool {
match op.node {
BiSub |
BiDiv |
BiEq |
BiLt |
BiLe |

4
src/lib.rs
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@ -37,6 +37,7 @@ use rustc_plugin::Registry;
#[macro_use]
pub mod utils;
pub mod copies;
pub mod consts;
pub mod types;
pub mod misc;
@ -157,6 +158,7 @@ pub fn plugin_registrar(reg: &mut Registry) {
reg.register_late_lint_pass(box drop_ref::DropRefPass);
reg.register_late_lint_pass(box types::AbsurdUnsignedComparisons);
reg.register_late_lint_pass(box regex::RegexPass);
reg.register_late_lint_pass(box copies::CopyAndPaste);
reg.register_lint_group("clippy_pedantic", vec![
enum_glob_use::ENUM_GLOB_USE,
@ -190,6 +192,8 @@ pub fn plugin_registrar(reg: &mut Registry) {
block_in_if_condition::BLOCK_IN_IF_CONDITION_EXPR,
block_in_if_condition::BLOCK_IN_IF_CONDITION_STMT,
collapsible_if::COLLAPSIBLE_IF,
copies::IF_SAME_THEN_ELSE,
copies::IFS_SAME_COND,
cyclomatic_complexity::CYCLOMATIC_COMPLEXITY,
derive::DERIVE_HASH_NOT_EQ,
derive::EXPL_IMPL_CLONE_ON_COPY,

4
src/strings.rs
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@ -84,7 +84,7 @@ impl LateLintPass for StringAdd {
if let Some(ref p) = parent {
if let ExprAssign(ref target, _) = p.node {
// avoid duplicate matches
if is_exp_equal(cx, target, left) {
if is_exp_equal(cx, target, left, false) {
return;
}
}
@ -113,7 +113,7 @@ fn is_string(cx: &LateContext, e: &Expr) -> bool {
fn is_add(cx: &LateContext, src: &Expr, target: &Expr) -> bool {
match src.node {
ExprBinary(Spanned{ node: BiAdd, .. }, ref left, _) => is_exp_equal(cx, target, left),
ExprBinary(Spanned{ node: BiAdd, .. }, ref left, _) => is_exp_equal(cx, target, left, false),
ExprBlock(ref block) => {
block.stmts.is_empty() && block.expr.as_ref().map_or(false, |expr| is_add(cx, expr, target))
}

176
src/utils.rs
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@ -589,29 +589,183 @@ fn parse_attrs<F: FnMut(u64)>(sess: &Session, attrs: &[ast::Attribute], name: &'
}
}
pub fn is_exp_equal(cx: &LateContext, left: &Expr, right: &Expr) -> bool {
/// Check whether two statements are the same.
/// See also `is_exp_equal`.
pub fn is_stmt_equal(cx: &LateContext, left: &Stmt, right: &Stmt, ignore_fn: bool) -> bool {
match (&left.node, &right.node) {
(&StmtDecl(ref l, _), &StmtDecl(ref r, _)) => {
if let (&DeclLocal(ref l), &DeclLocal(ref r)) = (&l.node, &r.node) {
// TODO: tys
l.ty.is_none() && r.ty.is_none() &&
both(&l.init, &r.init, |l, r| is_exp_equal(cx, l, r, ignore_fn))
}
else {
false
}
}
(&StmtExpr(ref l, _), &StmtExpr(ref r, _)) => is_exp_equal(cx, l, r, ignore_fn),
(&StmtSemi(ref l, _), &StmtSemi(ref r, _)) => is_exp_equal(cx, l, r, ignore_fn),
_ => false,
}
}
/// Check whether two blocks are the same.
/// See also `is_exp_equal`.
pub fn is_block_equal(cx: &LateContext, left: &Block, right: &Block, ignore_fn: bool) -> bool {
over(&left.stmts, &right.stmts, |l, r| is_stmt_equal(cx, l, r, ignore_fn)) &&
both(&left.expr, &right.expr, |l, r| is_exp_equal(cx, l, r, ignore_fn))
}
/// Check whether two pattern are the same.
/// See also `is_exp_equal`.
pub fn is_pat_equal(cx: &LateContext, left: &Pat, right: &Pat, ignore_fn: bool) -> bool {
match (&left.node, &right.node) {
(&PatBox(ref l), &PatBox(ref r)) => {
is_pat_equal(cx, l, r, ignore_fn)
}
(&PatEnum(ref lp, ref la), &PatEnum(ref rp, ref ra)) => {
is_path_equal(lp, rp) &&
both(la, ra, |l, r| {
over(l, r, |l, r| is_pat_equal(cx, l, r, ignore_fn))
})
}
(&PatIdent(ref lb, ref li, ref lp), &PatIdent(ref rb, ref ri, ref rp)) => {
lb == rb && li.node.name.as_str() == ri.node.name.as_str() &&
both(lp, rp, |l, r| is_pat_equal(cx, l, r, ignore_fn))
}
(&PatLit(ref l), &PatLit(ref r)) => {
is_exp_equal(cx, l, r, ignore_fn)
}
(&PatQPath(ref ls, ref lp), &PatQPath(ref rs, ref rp)) => {
is_qself_equal(ls, rs) && is_path_equal(lp, rp)
}
(&PatTup(ref l), &PatTup(ref r)) => {
over(l, r, |l, r| is_pat_equal(cx, l, r, ignore_fn))
}
(&PatRange(ref ls, ref le), &PatRange(ref rs, ref re)) => {
is_exp_equal(cx, ls, rs, ignore_fn) &&
is_exp_equal(cx, le, re, ignore_fn)
}
(&PatRegion(ref le, ref lm), &PatRegion(ref re, ref rm)) => {
lm == rm && is_pat_equal(cx, le, re, ignore_fn)
}
(&PatVec(ref ls, ref li, ref le), &PatVec(ref rs, ref ri, ref re)) => {
over(ls, rs, |l, r| is_pat_equal(cx, l, r, ignore_fn)) &&
over(le, re, |l, r| is_pat_equal(cx, l, r, ignore_fn)) &&
both(li, ri, |l, r| is_pat_equal(cx, l, r, ignore_fn))
}
(&PatWild, &PatWild) => true,
_ => false,
}
}
/// Check whether two expressions are the same. This is different from the operator `==` on
/// expression as this operator would compare true equality with ID and span.
/// If `ignore_fn` is true, never consider as equal fonction calls.
///
/// Note that some expression kinds are not considered but could be added.
#[allow(cyclomatic_complexity)] // ok, it’s a big function, but mostly one big match with simples cases
pub fn is_exp_equal(cx: &LateContext, left: &Expr, right: &Expr, ignore_fn: bool) -> bool {
if let (Some(l), Some(r)) = (constant(cx, left), constant(cx, right)) {
if l == r {
return true;
}
}
match (&left.node, &right.node) {
(&ExprAddrOf(ref lmut, ref le), &ExprAddrOf(ref rmut, ref re)) => {
lmut == rmut && is_exp_equal(cx, le, re, ignore_fn)
}
(&ExprAgain(li), &ExprAgain(ri)) => {
both(&li, &ri, |l, r| l.node.name.as_str() == r.node.name.as_str())
}
(&ExprAssign(ref ll, ref lr), &ExprAssign(ref rl, ref rr)) => {
is_exp_equal(cx, ll, rl, ignore_fn) && is_exp_equal(cx, lr, rr, ignore_fn)
}
(&ExprAssignOp(ref lo, ref ll, ref lr), &ExprAssignOp(ref ro, ref rl, ref rr)) => {
lo.node == ro.node && is_exp_equal(cx, ll, rl, ignore_fn) && is_exp_equal(cx, lr, rr, ignore_fn)
}
(&ExprBlock(ref l), &ExprBlock(ref r)) => {
is_block_equal(cx, l, r, ignore_fn)
}
(&ExprBinary(lop, ref ll, ref lr), &ExprBinary(rop, ref rl, ref rr)) => {
lop.node == rop.node && is_exp_equal(cx, ll, rl, ignore_fn) && is_exp_equal(cx, lr, rr, ignore_fn)
}
(&ExprBreak(li), &ExprBreak(ri)) => {
both(&li, &ri, |l, r| l.node.name.as_str() == r.node.name.as_str())
}
(&ExprBox(ref l), &ExprBox(ref r)) => {
is_exp_equal(cx, l, r, ignore_fn)
}
(&ExprCall(ref lfun, ref largs), &ExprCall(ref rfun, ref rargs)) => {
!ignore_fn &&
is_exp_equal(cx, lfun, rfun, ignore_fn) &&
is_exps_equal(cx, largs, rargs, ignore_fn)
}
(&ExprCast(ref lx, ref lt), &ExprCast(ref rx, ref rt)) => {
is_exp_equal(cx, lx, rx, ignore_fn) && is_cast_ty_equal(lt, rt)
}
(&ExprField(ref lfexp, ref lfident), &ExprField(ref rfexp, ref rfident)) => {
lfident.node == rfident.node && is_exp_equal(cx, lfexp, rfexp)
lfident.node == rfident.node && is_exp_equal(cx, lfexp, rfexp, ignore_fn)
}
(&ExprIndex(ref la, ref li), &ExprIndex(ref ra, ref ri)) => {
is_exp_equal(cx, la, ra, ignore_fn) && is_exp_equal(cx, li, ri, ignore_fn)
}
(&ExprIf(ref lc, ref lt, ref le), &ExprIf(ref rc, ref rt, ref re)) => {
is_exp_equal(cx, lc, rc, ignore_fn) &&
is_block_equal(cx, lt, rt, ignore_fn) &&
both(le, re, |l, r| is_exp_equal(cx, l, r, ignore_fn))
}
(&ExprLit(ref l), &ExprLit(ref r)) => l.node == r.node,
(&ExprMatch(ref le, ref la, ref ls), &ExprMatch(ref re, ref ra, ref rs)) => {
ls == rs &&
is_exp_equal(cx, le, re, ignore_fn) &&
over(la, ra, |l, r| {
is_exp_equal(cx, &l.body, &r.body, ignore_fn) &&
both(&l.guard, &r.guard, |l, r| is_exp_equal(cx, l, r, ignore_fn)) &&
over(&l.pats, &r.pats, |l, r| is_pat_equal(cx, l, r, ignore_fn))
})
}
(&ExprMethodCall(ref lname, ref ltys, ref largs), &ExprMethodCall(ref rname, ref rtys, ref rargs)) => {
// TODO: tys
!ignore_fn &&
lname.node == rname.node &&
ltys.is_empty() &&
rtys.is_empty() &&
is_exps_equal(cx, largs, rargs, ignore_fn)
}
(&ExprRange(ref lb, ref le), &ExprRange(ref rb, ref re)) => {
both(lb, rb, |l, r| is_exp_equal(cx, l, r, ignore_fn)) &&
both(le, re, |l, r| is_exp_equal(cx, l, r, ignore_fn))
}
(&ExprRepeat(ref le, ref ll), &ExprRepeat(ref re, ref rl)) => {
is_exp_equal(cx, le, re, ignore_fn) && is_exp_equal(cx, ll, rl, ignore_fn)
}
(&ExprRet(ref l), &ExprRet(ref r)) => {
both(l, r, |l, r| is_exp_equal(cx, l, r, ignore_fn))
}
(&ExprPath(ref lqself, ref lsubpath), &ExprPath(ref rqself, ref rsubpath)) => {
both(lqself, rqself, is_qself_equal) && is_path_equal(lsubpath, rsubpath)
}
(&ExprTup(ref ltup), &ExprTup(ref rtup)) => is_exps_equal(cx, ltup, rtup),
(&ExprVec(ref l), &ExprVec(ref r)) => is_exps_equal(cx, l, r),
(&ExprCast(ref lx, ref lt), &ExprCast(ref rx, ref rt)) => is_exp_equal(cx, lx, rx) && is_cast_ty_equal(lt, rt),
(&ExprTup(ref ltup), &ExprTup(ref rtup)) => is_exps_equal(cx, ltup, rtup, ignore_fn),
(&ExprTupField(ref le, li), &ExprTupField(ref re, ri)) => {
li.node == ri.node && is_exp_equal(cx, le, re, ignore_fn)
}
(&ExprUnary(lop, ref le), &ExprUnary(rop, ref re)) => {
lop == rop && is_exp_equal(cx, le, re, ignore_fn)
}
(&ExprVec(ref l), &ExprVec(ref r)) => is_exps_equal(cx, l, r, ignore_fn),
(&ExprWhile(ref lc, ref lb, ref ll), &ExprWhile(ref rc, ref rb, ref rl)) => {
is_exp_equal(cx, lc, rc, ignore_fn) &&
is_block_equal(cx, lb, rb, ignore_fn) &&
both(ll, rl, |l, r| l.name.as_str() == r.name.as_str())
}
_ => false,
}
}
fn is_exps_equal(cx: &LateContext, left: &[P<Expr>], right: &[P<Expr>]) -> bool {
over(left, right, |l, r| is_exp_equal(cx, l, r))
fn is_exps_equal(cx: &LateContext, left: &[P<Expr>], right: &[P<Expr>], ignore_fn: bool) -> bool {
over(left, right, |l, r| is_exp_equal(cx, l, r, ignore_fn))
}
fn is_path_equal(left: &Path, right: &Path) -> bool {
@ -620,20 +774,22 @@ fn is_path_equal(left: &Path, right: &Path) -> bool {
left.global == right.global &&
over(&left.segments,
&right.segments,
|l, r| l.identifier.name == r.identifier.name && l.parameters == r.parameters)
|l, r| l.identifier.name.as_str() == r.identifier.name.as_str() && l.parameters == r.parameters)
}
fn is_qself_equal(left: &QSelf, right: &QSelf) -> bool {
left.ty.node == right.ty.node && left.position == right.position
}
fn over<X, F>(left: &[X], right: &[X], mut eq_fn: F) -> bool
/// Check if two slices are equal as per `eq_fn`.
pub fn over<X, F>(left: &[X], right: &[X], mut eq_fn: F) -> bool
where F: FnMut(&X, &X) -> bool
{
left.len() == right.len() && left.iter().zip(right).all(|(x, y)| eq_fn(x, y))
}
fn both<X, F>(l: &Option<X>, r: &Option<X>, mut eq_fn: F) -> bool
/// Check if the two `Option`s are both `None` or some equal values as per `eq_fn`.
pub fn both<X, F>(l: &Option<X>, r: &Option<X>, mut eq_fn: F) -> bool
where F: FnMut(&X, &X) -> bool
{
l.as_ref().map_or_else(|| r.is_none(), |x| r.as_ref().map_or(false, |y| eq_fn(x, y)))

135
tests/compile-fail/copies.rs Executable file
View File

@ -0,0 +1,135 @@
#![feature(plugin)]
#![plugin(clippy)]
#![allow(dead_code)]
#![allow(let_and_return)]
#![allow(needless_return)]
#![allow(unused_variables)]
#![deny(if_same_then_else)]
#![deny(ifs_same_cond)]
fn foo() -> bool { unimplemented!() }
fn if_same_then_else() -> &'static str {
if true { //~ERROR this if has the same then and else blocks
foo();
}
else {
foo();
}
if true {
foo();
foo();
}
else {
foo();
}
let _ = if true { //~ERROR this if has the same then and else blocks
foo();
42
}
else {
foo();
42
};
if true {
foo();
}
let _ = if true { //~ERROR this if has the same then and else blocks
42
}
else {
42
};
if true { //~ERROR this if has the same then and else blocks
let bar = if true {
42
}
else {
43
};
while foo() { break; }
bar + 1;
}
else {
let bar = if true {
42
}
else {
43
};
while foo() { break; }
bar + 1;
}
if true { //~ERROR this if has the same then and else blocks
match 42 {
42 => (),
a if a > 0 => (),
10...15 => (),
_ => (),
}
}
else {
match 42 {
42 => (),
a if a > 0 => (),
10...15 => (),
_ => (),
}
}
if true { //~ERROR this if has the same then and else blocks
if let Some(a) = Some(42) {}
}
else {
if let Some(a) = Some(42) {}
}
if true { //~ERROR this if has the same then and else blocks
let foo = "";
return &foo[0..];
}
else {
let foo = "";
return &foo[0..];
}
}
fn ifs_same_cond() {
let a = 0;
if a == 1 {
}
else if a == 1 { //~ERROR this if has the same condition as a previous if
}
if 2*a == 1 {
}
else if 2*a == 2 {
}
else if 2*a == 1 { //~ERROR this if has the same condition as a previous if
}
else if a == 1 {
}
let mut v = vec![1];
if v.pop() == None { // ok, functions
}
else if v.pop() == None {
}
if v.len() == 42 { // ok, functions
}
else if v.len() == 42 {
}
}
fn main() {}

19
tests/compile-fail/eq_op.rs
View File

@ -19,9 +19,9 @@ fn main() {
// unary and binary operators
(-(2) < -(2)); //~ERROR equal expressions
((1 + 1) & (1 + 1) == (1 + 1) & (1 + 1));
//~^ ERROR equal expressions
//~^^ ERROR equal expressions
//~^^^ ERROR equal expressions
//~^ ERROR equal expressions as operands to `==`
//~^^ ERROR equal expressions as operands to `&`
//~^^^ ERROR equal expressions as operands to `&`
(1 * 2) + (3 * 4) == 1 * 2 + 3 * 4; //~ERROR equal expressions
// various other things
@ -31,5 +31,16 @@ fn main() {
// const folding
1 + 1 == 2; //~ERROR equal expressions
1 - 1 == 0; //~ERROR equal expressions
1 - 1 == 0; //~ERROR equal expressions as operands to `==`
//~^ ERROR equal expressions as operands to `-`
1 - 1; //~ERROR equal expressions
1 / 1; //~ERROR equal expressions
true && true; //~ERROR equal expressions
true || true; //~ERROR equal expressions
let mut a = vec![1];
a == a; //~ERROR equal expressions
2*a.len() == 2*a.len(); // ok, functions
a.pop() == a.pop(); // ok, functions
}

1
tests/compile-fail/identity_op.rs
View File

@ -5,6 +5,7 @@ const ONE : i64 = 1;
const NEG_ONE : i64 = -1;
const ZERO : i64 = 0;
#[allow(eq_op)]
#[deny(identity_op)]
fn main() {
let x = 0;

1
tests/compile-fail/needless_bool.rs
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@ -1,6 +1,7 @@
#![feature(plugin)]
#![plugin(clippy)]
#[allow(if_same_then_else)]
#[deny(needless_bool)]
fn main() {
let x = true;

4
tests/compile-fail/zero_div_zero.rs
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@ -5,9 +5,13 @@
#[deny(zero_divided_by_zero)]
fn main() {
let nan = 0.0 / 0.0; //~ERROR constant division of 0.0 with 0.0 will always result in NaN
//~^ equal expressions as operands to `/`
let f64_nan = 0.0 / 0.0f64; //~ERROR constant division of 0.0 with 0.0 will always result in NaN
//~^ equal expressions as operands to `/`
let other_f64_nan = 0.0f64 / 0.0; //~ERROR constant division of 0.0 with 0.0 will always result in NaN
//~^ equal expressions as operands to `/`
let one_more_f64_nan = 0.0f64/0.0f64; //~ERROR constant division of 0.0 with 0.0 will always result in NaN
//~^ equal expressions as operands to `/`
let zero = 0.0;
let other_zero = 0.0;
let other_nan = zero / other_zero; // fine - this lint doesn't propegate constants.