1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
use rustc::lint::*;
use syntax::ast::*;
use utils::{in_macro, span_lint};
declare_lint! {
pub ITEMS_AFTER_STATEMENTS,
Allow,
"blocks where an item comes after a statement"
}
pub struct ItemsAfterStatements;
impl LintPass for ItemsAfterStatements {
fn get_lints(&self) -> LintArray {
lint_array!(ITEMS_AFTER_STATEMENTS)
}
}
impl EarlyLintPass for ItemsAfterStatements {
fn check_block(&mut self, cx: &EarlyContext, item: &Block) {
if in_macro(item.span) {
return;
}
let stmts = item.stmts
.iter()
.map(|stmt| &stmt.node)
.skip_while(|s| matches!(**s, StmtKind::Item(..)));
for stmt in stmts {
if let StmtKind::Item(ref it) = *stmt {
if in_macro(it.span) {
return;
}
if let ItemKind::MacroDef(..) = it.node {
continue;
}
span_lint(cx,
ITEMS_AFTER_STATEMENTS,
it.span,
"adding items after statements is confusing, since items exist from the \
start of the scope");
}
}
}
}