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Fix #[expect] for clippy::needless_return

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xFrednet 2022-06-25 14:16:31 +02:00
parent 54ad99b6e5
commit bdc6ece1b6
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GPG key ID: F5C59D0E669E5302
4 changed files with 109 additions and 56 deletions
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71
clippy_lints/src/returns.rs
View file

@ -1,4 +1,4 @@
use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
use clippy_utils::diagnostics::span_lint_hir_and_then;
use clippy_utils::source::{snippet_opt, snippet_with_context};
use clippy_utils::{fn_def_id, path_to_local_id};
use if_chain::if_chain;
@ -94,9 +94,10 @@ impl<'tcx> LateLintPass<'tcx> for Return {
if !in_external_macro(cx.sess(), retexpr.span);
if !local.span.from_expansion();
then {
span_lint_and_then(
span_lint_hir_and_then(
cx,
LET_AND_RETURN,
retexpr.hir_id,
retexpr.span,
"returning the result of a `let` binding from a block",
|err| {
@ -185,6 +186,7 @@ fn check_final_expr<'tcx>(
if !borrows {
emit_return_lint(
cx,
inner.map_or(expr.hir_id, |inner| inner.hir_id),
span.expect("`else return` is not possible"),
inner.as_ref().map(|i| i.span),
replacement,
@ -220,50 +222,81 @@ fn check_final_expr<'tcx>(
}
}
fn emit_return_lint(cx: &LateContext<'_>, ret_span: Span, inner_span: Option<Span>, replacement: RetReplacement) {
fn emit_return_lint(
cx: &LateContext<'_>,
emission_place: HirId,
ret_span: Span,
inner_span: Option<Span>,
replacement: RetReplacement,
) {
if ret_span.from_expansion() {
return;
}
match inner_span {
Some(inner_span) => {
let mut applicability = Applicability::MachineApplicable;
span_lint_and_then(cx, NEEDLESS_RETURN, ret_span, "unneeded `return` statement", |diag| {
let (snippet, _) = snippet_with_context(cx, inner_span, ret_span.ctxt(), "..", &mut applicability);
diag.span_suggestion(ret_span, "remove `return`", snippet, applicability);
});
span_lint_hir_and_then(
cx,
NEEDLESS_RETURN,
emission_place,
ret_span,
"unneeded `return` statement",
|diag| {
let (snippet, _) = snippet_with_context(cx, inner_span, ret_span.ctxt(), "..", &mut applicability);
diag.span_suggestion(ret_span, "remove `return`", snippet, applicability);
},
);
},
None => match replacement {
RetReplacement::Empty => {
span_lint_and_sugg(
span_lint_hir_and_then(
cx,
NEEDLESS_RETURN,
emission_place,
ret_span,
"unneeded `return` statement",
"remove `return`",
String::new(),
Applicability::MachineApplicable,
|diag| {
diag.span_suggestion(
ret_span,
"remove `return`",
String::new(),
Applicability::MachineApplicable,
);
},
);
},
RetReplacement::Block => {
span_lint_and_sugg(
span_lint_hir_and_then(
cx,
NEEDLESS_RETURN,
emission_place,
ret_span,
"unneeded `return` statement",
"replace `return` with an empty block",
"{}".to_string(),
Applicability::MachineApplicable,
|diag| {
diag.span_suggestion(
ret_span,
"replace `return` with an empty block",
"{}".to_string(),
Applicability::MachineApplicable,
);
},
);
},
RetReplacement::Unit => {
span_lint_and_sugg(
span_lint_hir_and_then(
cx,
NEEDLESS_RETURN,
emission_place,
ret_span,
"unneeded `return` statement",
"replace `return` with a unit value",
"()".to_string(),
Applicability::MachineApplicable,
|diag| {
diag.span_suggestion(
ret_span,
"replace `return` with a unit value",
"()".to_string(),
Applicability::MachineApplicable,
);
},
);
},
},

10
tests/ui/needless_return.fixed
View file

@ -1,5 +1,6 @@
// run-rustfix
#![feature(lint_reasons)]
#![feature(let_else)]
#![allow(unused)]
#![allow(
@ -227,4 +228,13 @@ fn needless_return_macro() -> String {
format!("Hello {}", "world!")
}
fn check_expect() -> bool {
if true {
// no error!
return true;
}
#[expect(clippy::needless_return)]
return true;
}
fn main() {}

10
tests/ui/needless_return.rs
View file

@ -1,5 +1,6 @@
// run-rustfix
#![feature(lint_reasons)]
#![feature(let_else)]
#![allow(unused)]
#![allow(
@ -227,4 +228,13 @@ fn needless_return_macro() -> String {
return format!("Hello {}", "world!");
}
fn check_expect() -> bool {
if true {
// no error!
return true;
}
#[expect(clippy::needless_return)]
return true;
}
fn main() {}

74
tests/ui/needless_return.stderr
View file

@ -1,5 +1,5 @@
error: unneeded `return` statement
--> $DIR/needless_return.rs:26:5
--> $DIR/needless_return.rs:27:5
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
@ -7,217 +7,217 @@ LL | return true;
= note: `-D clippy::needless-return` implied by `-D warnings`
error: unneeded `return` statement
--> $DIR/needless_return.rs:30:5
--> $DIR/needless_return.rs:31:5
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:35:9
--> $DIR/needless_return.rs:36:9
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:37:9
--> $DIR/needless_return.rs:38:9
|
LL | return false;
| ^^^^^^^^^^^^^ help: remove `return`: `false`
error: unneeded `return` statement
--> $DIR/needless_return.rs:43:17
--> $DIR/needless_return.rs:44:17
|
LL | true => return false,
| ^^^^^^^^^^^^ help: remove `return`: `false`
error: unneeded `return` statement
--> $DIR/needless_return.rs:45:13
--> $DIR/needless_return.rs:46:13
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:52:9
--> $DIR/needless_return.rs:53:9
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:54:16
--> $DIR/needless_return.rs:55:16
|
LL | let _ = || return true;
| ^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:58:5
--> $DIR/needless_return.rs:59:5
|
LL | return the_answer!();
| ^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `the_answer!()`
error: unneeded `return` statement
--> $DIR/needless_return.rs:62:5
--> $DIR/needless_return.rs:63:5
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:67:9
--> $DIR/needless_return.rs:68:9
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:69:9
--> $DIR/needless_return.rs:70:9
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:76:14
--> $DIR/needless_return.rs:77:14
|
LL | _ => return,
| ^^^^^^ help: replace `return` with a unit value: `()`
error: unneeded `return` statement
--> $DIR/needless_return.rs:85:13
--> $DIR/needless_return.rs:86:13
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:87:14
--> $DIR/needless_return.rs:88:14
|
LL | _ => return,
| ^^^^^^ help: replace `return` with a unit value: `()`
error: unneeded `return` statement
--> $DIR/needless_return.rs:100:9
--> $DIR/needless_return.rs:101:9
|
LL | return String::from("test");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `String::from("test")`
error: unneeded `return` statement
--> $DIR/needless_return.rs:102:9
--> $DIR/needless_return.rs:103:9
|
LL | return String::new();
| ^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `String::new()`
error: unneeded `return` statement
--> $DIR/needless_return.rs:124:32
--> $DIR/needless_return.rs:125:32
|
LL | bar.unwrap_or_else(|_| return)
| ^^^^^^ help: replace `return` with an empty block: `{}`
error: unneeded `return` statement
--> $DIR/needless_return.rs:129:13
--> $DIR/needless_return.rs:130:13
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:131:20
--> $DIR/needless_return.rs:132:20
|
LL | let _ = || return;
| ^^^^^^ help: replace `return` with an empty block: `{}`
error: unneeded `return` statement
--> $DIR/needless_return.rs:137:32
--> $DIR/needless_return.rs:138:32
|
LL | res.unwrap_or_else(|_| return Foo)
| ^^^^^^^^^^ help: remove `return`: `Foo`
error: unneeded `return` statement
--> $DIR/needless_return.rs:146:5
--> $DIR/needless_return.rs:147:5
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:150:5
--> $DIR/needless_return.rs:151:5
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:155:9
--> $DIR/needless_return.rs:156:9
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:157:9
--> $DIR/needless_return.rs:158:9
|
LL | return false;
| ^^^^^^^^^^^^^ help: remove `return`: `false`
error: unneeded `return` statement
--> $DIR/needless_return.rs:163:17
--> $DIR/needless_return.rs:164:17
|
LL | true => return false,
| ^^^^^^^^^^^^ help: remove `return`: `false`
error: unneeded `return` statement
--> $DIR/needless_return.rs:165:13
--> $DIR/needless_return.rs:166:13
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:172:9
--> $DIR/needless_return.rs:173:9
|
LL | return true;
| ^^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:174:16
--> $DIR/needless_return.rs:175:16
|
LL | let _ = || return true;
| ^^^^^^^^^^^ help: remove `return`: `true`
error: unneeded `return` statement
--> $DIR/needless_return.rs:178:5
--> $DIR/needless_return.rs:179:5
|
LL | return the_answer!();
| ^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `the_answer!()`
error: unneeded `return` statement
--> $DIR/needless_return.rs:182:5
--> $DIR/needless_return.rs:183:5
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:187:9
--> $DIR/needless_return.rs:188:9
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:189:9
--> $DIR/needless_return.rs:190:9
|
LL | return;
| ^^^^^^^ help: remove `return`
error: unneeded `return` statement
--> $DIR/needless_return.rs:196:14
--> $DIR/needless_return.rs:197:14
|
LL | _ => return,
| ^^^^^^ help: replace `return` with a unit value: `()`
error: unneeded `return` statement
--> $DIR/needless_return.rs:209:9
--> $DIR/needless_return.rs:210:9
|
LL | return String::from("test");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `String::from("test")`
error: unneeded `return` statement
--> $DIR/needless_return.rs:211:9
--> $DIR/needless_return.rs:212:9
|
LL | return String::new();
| ^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `String::new()`
error: unneeded `return` statement
--> $DIR/needless_return.rs:227:5
--> $DIR/needless_return.rs:228:5
|
LL | return format!("Hello {}", "world!");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return`: `format!("Hello {}", "world!")`