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
|
if_chain! {
if let ExprKind::Block(ref block) = expr.kind;
if block.stmts.len() == 2;
if let StmtKind::Local(ref local) = block.stmts[0].kind;
if let Some(ref init) = local.init;
if let ExprKind::Lit(ref lit) = init.kind;
if let LitKind::Int(42, _) = lit.node;
if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = local.pat.kind;
if name.as_str() == "x";
if let StmtKind::Semi(ref e, _) = block.stmts[1].kind
if let ExprKind::Unary(UnOp::Neg, ref inner) = e.kind;
if let ExprKind::Path(ref path) = inner.kind;
if match_qpath(path, &["x"]);
if block.expr.is_none();
then {
// report your lint here
}
}
if_chain! {
if let ExprKind::Block(ref block) = expr.kind;
if block.stmts.len() == 1;
if let StmtKind::Local(ref local) = block.stmts[0].kind;
if let Some(ref init) = local.init;
if let ExprKind::Call(ref func, ref args) = init.kind;
if let ExprKind::Path(ref path) = func.kind;
if match_qpath(path, &["String", "new"]);
if args.len() == 0;
if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = local.pat.kind;
if name.as_str() == "expr";
if let Some(trailing_expr) = &block.expr;
if let ExprKind::Call(ref func1, ref args1) = trailing_expr.kind;
if let ExprKind::Path(ref path1) = func1.kind;
if match_qpath(path1, &["drop"]);
if args1.len() == 1;
if let ExprKind::Path(ref path2) = args1[0].kind;
if match_qpath(path2, &["expr"]);
then {
// report your lint here
}
}
|
