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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
#![warn(clippy::only_used_in_recursion)]
fn simple(a: usize, b: usize) -> usize {
if a == 0 { 1 } else { simple(a - 1, b) }
}
fn with_calc(a: usize, b: isize) -> usize {
if a == 0 { 1 } else { with_calc(a - 1, -b + 1) }
}
fn tuple((a, b): (usize, usize)) -> usize {
if a == 0 { 1 } else { tuple((a - 1, b + 1)) }
}
fn let_tuple(a: usize, b: usize) -> usize {
let (c, d) = (a, b);
if c == 0 { 1 } else { let_tuple(c - 1, d + 1) }
}
fn array([a, b]: [usize; 2]) -> usize {
if a == 0 { 1 } else { array([a - 1, b + 1]) }
}
fn index(a: usize, mut b: &[usize], c: usize) -> usize {
if a == 0 { 1 } else { index(a - 1, b, c + b[0]) }
}
fn break_(a: usize, mut b: usize, mut c: usize) -> usize {
let c = loop {
b += 1;
c += 1;
if c == 10 {
break b;
}
};
if a == 0 { 1 } else { break_(a - 1, c, c) }
}
// this has a side effect
fn mut_ref(a: usize, b: &mut usize) -> usize {
*b = 1;
if a == 0 { 1 } else { mut_ref(a - 1, b) }
}
fn mut_ref2(a: usize, b: &mut usize) -> usize {
let mut c = *b;
if a == 0 { 1 } else { mut_ref2(a - 1, &mut c) }
}
fn not_primitive(a: usize, b: String) -> usize {
if a == 0 { 1 } else { not_primitive(a - 1, b) }
}
// this doesn't have a side effect,
// but `String` is not primitive.
fn not_primitive_op(a: usize, b: String, c: &str) -> usize {
if a == 1 { 1 } else { not_primitive_op(a, b + c, c) }
}
struct A;
impl A {
fn method(a: usize, b: usize) -> usize {
if a == 0 { 1 } else { A::method(a - 1, b - 1) }
}
fn method2(&self, a: usize, b: usize) -> usize {
if a == 0 { 1 } else { self.method2(a - 1, b + 1) }
}
}
trait B {
fn hello(a: usize, b: usize) -> usize;
fn hello2(&self, a: usize, b: usize) -> usize;
}
impl B for A {
fn hello(a: usize, b: usize) -> usize {
if a == 0 { 1 } else { A::hello(a - 1, b + 1) }
}
fn hello2(&self, a: usize, b: usize) -> usize {
if a == 0 { 1 } else { self.hello2(a - 1, b + 1) }
}
}
trait C {
fn hello(a: usize, b: usize) -> usize {
if a == 0 { 1 } else { Self::hello(a - 1, b + 1) }
}
fn hello2(&self, a: usize, b: usize) -> usize {
if a == 0 { 1 } else { self.hello2(a - 1, b + 1) }
}
}
fn ignore(a: usize, _: usize) -> usize {
if a == 1 { 1 } else { ignore(a - 1, 0) }
}
fn ignore2(a: usize, _b: usize) -> usize {
if a == 1 { 1 } else { ignore2(a - 1, _b) }
}
fn f1(a: u32) -> u32 {
a
}
fn f2(a: u32) -> u32 {
f1(a)
}
fn inner_fn(a: u32) -> u32 {
fn inner_fn(a: u32) -> u32 {
a
}
inner_fn(a)
}
fn main() {}
|
