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danieledapodanieledapo
committed
more idiomatic code
1 parent e1a78ae commit 66dbc02

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2 files changed

+51
-41
lines changed

2 files changed

+51
-41
lines changed

‎clippy_lints/src/returns.rs‎

Lines changed: 42 additions & 32 deletions
Original file line numberDiff line numberDiff line change
@@ -86,7 +86,7 @@ declare_clippy_lint! {
8686
#[derive(PartialEq, Eq, Copy, Clone)]
8787
enum RetReplacement {
8888
Empty,
89-
Unit
89+
Unit,
9090
}
9191

9292
declare_lint_pass!(Return => [NEEDLESS_RETURN, LET_AND_RETURN, UNUSED_UNIT]);
@@ -105,13 +105,24 @@ impl Return {
105105
}
106106

107107
// Check a the final expression in a block if it's a return.
108-
fn check_final_expr(&mut self, cx: &EarlyContext<'_>, expr: &ast::Expr, span: Option<Span>, replacement: RetReplacement) {
108+
fn check_final_expr(
109+
&mut self,
110+
cx: &EarlyContext<'_>,
111+
expr: &ast::Expr,
112+
span: Option<Span>,
113+
replacement: RetReplacement,
114+
) {
109115
match expr.node {
110116
// simple return is always "bad"
111117
ast::ExprKind::Ret(ref inner) => {
112118
// allow `#[cfg(a)] return a; #[cfg(b)] return b;`
113119
if !expr.attrs.iter().any(attr_is_cfg) {
114-
self.emit_return_lint(cx, span.expect("`else return` is not possible"), inner.as_ref().map(|i| i.span), replacement);
120+
self.emit_return_lint(
121+
cx,
122+
span.expect("`else return` is not possible"),
123+
inner.as_ref().map(|i| i.span),
124+
replacement,
125+
);
115126
}
116127
},
117128
// a whole block? check it!
@@ -135,7 +146,13 @@ impl Return {
135146
}
136147
}
137148

138-
fn emit_return_lint(&mut self, cx: &EarlyContext<'_>, ret_span: Span, inner_span: Option<Span>, replacement: RetReplacement) {
149+
fn emit_return_lint(
150+
&mut self,
151+
cx: &EarlyContext<'_>,
152+
ret_span: Span,
153+
inner_span: Option<Span>,
154+
replacement: RetReplacement,
155+
) {
139156
match inner_span {
140157
Some(inner_span) => {
141158
if in_external_macro(cx.sess(), inner_span) || in_macro_or_desugar(inner_span) {
@@ -144,39 +161,32 @@ impl Return {
144161

145162
span_lint_and_then(cx, NEEDLESS_RETURN, ret_span, "unneeded return statement", |db| {
146163
if let Some(snippet) = snippet_opt(cx, inner_span) {
164+
db.span_suggestion(ret_span, "remove `return`", snippet, Applicability::MachineApplicable);
165+
}
166+
})
167+
},
168+
None => match replacement {
169+
RetReplacement::Empty => {
170+
span_lint_and_then(cx, NEEDLESS_RETURN, ret_span, "unneeded return statement", |db| {
147171
db.span_suggestion(
148172
ret_span,
149-
"remove `return` as shown",
150-
snippet,
173+
"remove `return`",
174+
String::new(),
151175
Applicability::MachineApplicable,
152176
);
153-
}
154-
})
177+
});
178+
},
179+
RetReplacement::Unit => {
180+
span_lint_and_then(cx, NEEDLESS_RETURN, ret_span, "unneeded return statement", |db| {
181+
db.span_suggestion(
182+
ret_span,
183+
"replace `return` with the unit type",
184+
"()".to_string(),
185+
Applicability::MachineApplicable,
186+
);
187+
});
188+
},
155189
},
156-
None => {
157-
match replacement {
158-
RetReplacement::Empty => {
159-
span_lint_and_then(cx, NEEDLESS_RETURN, ret_span, "unneeded return statement", |db| {
160-
db.span_suggestion(
161-
ret_span,
162-
"remove `return`",
163-
String::new(),
164-
Applicability::MachineApplicable,
165-
);
166-
});
167-
}
168-
RetReplacement::Unit => {
169-
span_lint_and_then(cx, NEEDLESS_RETURN, ret_span, "unneeded return statement", |db| {
170-
db.span_suggestion(
171-
ret_span,
172-
"replace `return` with the unit type `()`",
173-
"()".to_string(),
174-
Applicability::MachineApplicable,
175-
);
176-
});
177-
}
178-
}
179-
}
180190
}
181191
}
182192

‎tests/ui/needless_return.stderr‎

Lines changed: 9 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -2,51 +2,51 @@ error: unneeded return statement
22
--> $DIR/needless_return.rs:14:5
33
|
44
LL | return true;
5-
| ^^^^^^^^^^^^ help: remove `return` as shown: `true`
5+
| ^^^^^^^^^^^^ help: remove `return`: `true`
66
|
77
= note: `-D clippy::needless-return` implied by `-D warnings`
88

99
error: unneeded return statement
1010
--> $DIR/needless_return.rs:18:5
1111
|
1212
LL | return true;
13-
| ^^^^^^^^^^^^ help: remove `return` as shown: `true`
13+
| ^^^^^^^^^^^^ help: remove `return`: `true`
1414

1515
error: unneeded return statement
1616
--> $DIR/needless_return.rs:23:9
1717
|
1818
LL | return true;
19-
| ^^^^^^^^^^^^ help: remove `return` as shown: `true`
19+
| ^^^^^^^^^^^^ help: remove `return`: `true`
2020

2121
error: unneeded return statement
2222
--> $DIR/needless_return.rs:25:9
2323
|
2424
LL | return false;
25-
| ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
25+
| ^^^^^^^^^^^^^ help: remove `return`: `false`
2626

2727
error: unneeded return statement
2828
--> $DIR/needless_return.rs:31:17
2929
|
3030
LL | true => return false,
31-
| ^^^^^^^^^^^^ help: remove `return` as shown: `false`
31+
| ^^^^^^^^^^^^ help: remove `return`: `false`
3232

3333
error: unneeded return statement
3434
--> $DIR/needless_return.rs:33:13
3535
|
3636
LL | return true;
37-
| ^^^^^^^^^^^^ help: remove `return` as shown: `true`
37+
| ^^^^^^^^^^^^ help: remove `return`: `true`
3838

3939
error: unneeded return statement
4040
--> $DIR/needless_return.rs:40:9
4141
|
4242
LL | return true;
43-
| ^^^^^^^^^^^^ help: remove `return` as shown: `true`
43+
| ^^^^^^^^^^^^ help: remove `return`: `true`
4444

4545
error: unneeded return statement
4646
--> $DIR/needless_return.rs:42:16
4747
|
4848
LL | let _ = || return true;
49-
| ^^^^^^^^^^^ help: remove `return` as shown: `true`
49+
| ^^^^^^^^^^^ help: remove `return`: `true`
5050

5151
error: unneeded return statement
5252
--> $DIR/needless_return.rs:50:5
@@ -70,7 +70,7 @@ error: unneeded return statement
7070
--> $DIR/needless_return.rs:64:14
7171
|
7272
LL | _ => return,
73-
| ^^^^^^ help: replace `return` with the unit type `()`: `()`
73+
| ^^^^^^ help: replace `return` with the unit type: `()`
7474

7575
error: aborting due to 12 previous errors
7676

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