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Auto merge of #11456 - tom-anders:std_instead_of_core_suggestion, r=Manishearth

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Add suggestions for std_instead_of_core

```
changelog: [`std_instead_of_core`]: add suggestions
```

Fixes #11446
This commit is contained in:
bors 2023-09-08 15:59:00 +00:00
commit 27165acadf
4 changed files with 101 additions and 59 deletions
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26
clippy_lints/src/std_instead_of_core.rs
View File

@ -1,4 +1,5 @@
use clippy_utils::diagnostics::span_lint_and_help;
use clippy_utils::diagnostics::span_lint_and_sugg;
use rustc_errors::Applicability;
use rustc_hir::def::Res;
use rustc_hir::def_id::DefId;
use rustc_hir::{HirId, Path, PathSegment};
@ -99,17 +100,17 @@ impl<'tcx> LateLintPass<'tcx> for StdReexports {
&& let Some(first_segment) = get_first_segment(path)
&& is_stable(cx, def_id)
{
let (lint, msg, help) = match first_segment.ident.name {
let (lint, used_mod, replace_with) = match first_segment.ident.name {
sym::std => match cx.tcx.crate_name(def_id.krate) {
sym::core => (
STD_INSTEAD_OF_CORE,
"used import from `std` instead of `core`",
"consider importing the item from `core`",
"std",
"core",
),
sym::alloc => (
STD_INSTEAD_OF_ALLOC,
"used import from `std` instead of `alloc`",
"consider importing the item from `alloc`",
"std",
"alloc",
),
_ => {
self.prev_span = path.span;
@ -120,8 +121,8 @@ impl<'tcx> LateLintPass<'tcx> for StdReexports {
if cx.tcx.crate_name(def_id.krate) == sym::core {
(
ALLOC_INSTEAD_OF_CORE,
"used import from `alloc` instead of `core`",
"consider importing the item from `core`",
"alloc",
"core",
)
} else {
self.prev_span = path.span;
@ -131,7 +132,14 @@ impl<'tcx> LateLintPass<'tcx> for StdReexports {
_ => return,
};
if path.span != self.prev_span {
span_lint_and_help(cx, lint, path.span, msg, None, help);
span_lint_and_sugg(
cx,
lint,
first_segment.ident.span,
&format!("used import from `{used_mod}` instead of `{replace_with}`"),
&format!("consider importing the item from `{replace_with}`"),
replace_with.to_string(),
Applicability::MachineApplicable);
self.prev_span = path.span;
}
}

62
tests/ui/std_instead_of_core.fixed Normal file
View File

@ -0,0 +1,62 @@
#![warn(clippy::std_instead_of_core)]
#![allow(unused_imports)]
extern crate alloc;
#[warn(clippy::std_instead_of_core)]
fn std_instead_of_core() {
// Regular import
use core::hash::Hasher;
//~^ ERROR: used import from `std` instead of `core`
// Absolute path
use ::core::hash::Hash;
//~^ ERROR: used import from `std` instead of `core`
// Don't lint on `env` macro
use std::env;
// Multiple imports
use core::fmt::{Debug, Result};
//~^ ERROR: used import from `std` instead of `core`
// Function calls
let ptr = core::ptr::null::<u32>();
//~^ ERROR: used import from `std` instead of `core`
let ptr_mut = ::core::ptr::null_mut::<usize>();
//~^ ERROR: used import from `std` instead of `core`
// Types
let cell = core::cell::Cell::new(8u32);
//~^ ERROR: used import from `std` instead of `core`
let cell_absolute = ::core::cell::Cell::new(8u32);
//~^ ERROR: used import from `std` instead of `core`
let _ = std::env!("PATH");
// do not lint until `error_in_core` is stable
use std::error::Error;
// lint items re-exported from private modules, `core::iter::traits::iterator::Iterator`
use core::iter::Iterator;
//~^ ERROR: used import from `std` instead of `core`
}
#[warn(clippy::std_instead_of_alloc)]
fn std_instead_of_alloc() {
// Only lint once.
use alloc::vec;
//~^ ERROR: used import from `std` instead of `alloc`
use alloc::vec::Vec;
//~^ ERROR: used import from `std` instead of `alloc`
}
#[warn(clippy::alloc_instead_of_core)]
fn alloc_instead_of_core() {
use core::slice::from_ref;
//~^ ERROR: used import from `alloc` instead of `core`
}
fn main() {
std_instead_of_core();
std_instead_of_alloc();
alloc_instead_of_core();
}

1
tests/ui/std_instead_of_core.rs
View File

@ -17,7 +17,6 @@ fn std_instead_of_core() {
// Multiple imports
use std::fmt::{Debug, Result};
//~^ ERROR: used import from `std` instead of `core`
//~| ERROR: used import from `std` instead of `core`
// Function calls
let ptr = std::ptr::null::<u32>();

71
tests/ui/std_instead_of_core.stderr
View File

@ -2,103 +2,76 @@ error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:9:9
|
LL | use std::hash::Hasher;
| ^^^^^^^^^^^^^^^^^
| ^^^ help: consider importing the item from `core`: `core`
|
= help: consider importing the item from `core`
= note: `-D clippy::std-instead-of-core` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::std_instead_of_core)]`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:12:9
--> $DIR/std_instead_of_core.rs:12:11
|
LL | use ::std::hash::Hash;
| ^^^^^^^^^^^^^^^^^
|
= help: consider importing the item from `core`
| ^^^ help: consider importing the item from `core`: `core`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:18:20
--> $DIR/std_instead_of_core.rs:18:9
|
LL | use std::fmt::{Debug, Result};
| ^^^^^
|
= help: consider importing the item from `core`
| ^^^ help: consider importing the item from `core`: `core`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:18:27
|
LL | use std::fmt::{Debug, Result};
| ^^^^^^
|
= help: consider importing the item from `core`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:23:15
--> $DIR/std_instead_of_core.rs:22:15
|
LL | let ptr = std::ptr::null::<u32>();
| ^^^^^^^^^^^^^^^^^^^^^
|
= help: consider importing the item from `core`
| ^^^ help: consider importing the item from `core`: `core`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:25:19
--> $DIR/std_instead_of_core.rs:24:21
|
LL | let ptr_mut = ::std::ptr::null_mut::<usize>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: consider importing the item from `core`
| ^^^ help: consider importing the item from `core`: `core`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:29:16
--> $DIR/std_instead_of_core.rs:28:16
|
LL | let cell = std::cell::Cell::new(8u32);
| ^^^^^^^^^^^^^^^
|
= help: consider importing the item from `core`
| ^^^ help: consider importing the item from `core`: `core`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:31:25
--> $DIR/std_instead_of_core.rs:30:27
|
LL | let cell_absolute = ::std::cell::Cell::new(8u32);
| ^^^^^^^^^^^^^^^^^
|
= help: consider importing the item from `core`
| ^^^ help: consider importing the item from `core`: `core`
error: used import from `std` instead of `core`
--> $DIR/std_instead_of_core.rs:40:9
--> $DIR/std_instead_of_core.rs:39:9
|
LL | use std::iter::Iterator;
| ^^^^^^^^^^^^^^^^^^^
|
= help: consider importing the item from `core`
| ^^^ help: consider importing the item from `core`: `core`
error: used import from `std` instead of `alloc`
--> $DIR/std_instead_of_core.rs:47:9
--> $DIR/std_instead_of_core.rs:46:9
|
LL | use std::vec;
| ^^^^^^^^
| ^^^ help: consider importing the item from `alloc`: `alloc`
|
= help: consider importing the item from `alloc`
= note: `-D clippy::std-instead-of-alloc` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::std_instead_of_alloc)]`
error: used import from `std` instead of `alloc`
--> $DIR/std_instead_of_core.rs:49:9
--> $DIR/std_instead_of_core.rs:48:9
|
LL | use std::vec::Vec;
| ^^^^^^^^^^^^^
|
= help: consider importing the item from `alloc`
| ^^^ help: consider importing the item from `alloc`: `alloc`
error: used import from `alloc` instead of `core`
--> $DIR/std_instead_of_core.rs:55:9
--> $DIR/std_instead_of_core.rs:54:9
|
LL | use alloc::slice::from_ref;
| ^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^ help: consider importing the item from `core`: `core`
|
= help: consider importing the item from `core`
= note: `-D clippy::alloc-instead-of-core` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::alloc_instead_of_core)]`
error: aborting due to 12 previous errors
error: aborting due to 11 previous errors