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improve Int128 API (#123)
## Summary * make some small improvements to the `Int128` API * make `tester` treat `t*.nim` files as tests * add tests for `Int128` ## Details API improvements: * `<` and `<=` now treat the operands as signed integers * unsigned comparisons are renamed to `<=%` and `<%` (in line with the standard library naming scheme) * rename `/` to `div`, to reserve the former for fractions * `shl` and `shr` now consistently wrap the shift distance * accept all integer types with `toInt128`, not just `int` All usages of `Int128` comparisons are adjusted, except for the ones in `builtin.nim`, which should have been signed comparisons from the start (this fixes an interpreter bug). To easily run NimSkull-based tests, the tester now considers `t*.nim` as tests. A set of tests for `Int128` based on NimSkull's [tint128.nim](https://github.com/nim-works/nimskull/blob/d29187f73b5df6a99f51e828850e04bf7cf7b98d/tests/compiler/tint128.nim) is added to the test suite.
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lines changed

spec/builtin.nim

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -91,7 +91,7 @@ const arr = [
9191
("*", proc(n: Node): Node = makeNum(n[0].num * n[1].num)),
9292
("/", proc(n: Node): Node =
9393
# TODO: this needs to produce a rational number, not an integer
94-
makeNum(n[0].num / n[1].num)
94+
makeNum(n[0].num div n[1].num)
9595
),
9696
("neg", proc(n: Node): Node = makeNum(-n.num)),
9797
("^", proc(n: Node): Node =

spec/int128.nim

Lines changed: 12 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -10,9 +10,9 @@ type Int128* = object
1010
const
1111
Zero* = Int128()
1212

13-
proc toInt128*(x: int): Int128 =
13+
proc toInt128*(x: SomeInteger): Int128 =
1414
result.lo = cast[uint64](x)
15-
if x < 0:
15+
if x is SomeSignedInt and x < 0:
1616
result.hi = high(uint64) # sign extend the lower bits
1717

1818
proc toInt*(x: Int128): int =
@@ -42,7 +42,7 @@ proc `-`*(x: Int128): Int128 =
4242
result.hi = not(x.hi)
4343
result = result + Int128(lo: 1)
4444

45-
proc `shl`*(x: Int128, by: uint8): Int128 =
45+
proc `shl`*(x: Int128, by: int): Int128 =
4646
## Logical left shift.
4747
let by = by and 127
4848
if by == 0:
@@ -56,6 +56,7 @@ proc `shl`*(x: Int128, by: uint8): Int128 =
5656

5757
proc `shr`*(x: Int128, by: int): Int128 =
5858
## Logical right shift.
59+
let by = by and 127
5960
if by == 0:
6061
result = x
6162
elif by < 64:
@@ -65,25 +66,25 @@ proc `shr`*(x: Int128, by: int): Int128 =
6566
result.lo = (x.hi shr (by - 64))
6667
result.hi = 0
6768

68-
proc `<`*(a, b: Int128): bool =
69+
proc `<%`*(a, b: Int128): bool =
6970
## Unsigned less-than comparison.
7071
if a.hi < b.hi: true
7172
elif a.hi == b.hi: a.lo < b.lo
7273
else: false
7374

74-
proc `<=`*(a, b: Int128): bool =
75+
proc `<=%`*(a, b: Int128): bool =
7576
## Unsigned less-than-or-equal comparison.
7677
if a.hi < b.hi: true
7778
elif a.hi == b.hi: a.lo <= b.lo
7879
else: false
7980

80-
proc below*(a, b: Int128): bool =
81+
proc `<`*(a, b: Int128): bool =
8182
## Signed less-than comparison.
8283
if cast[int64](a.hi) < cast[int64](b.hi): true
8384
elif a.hi == b.hi: a.lo < b.lo
8485
else: false
8586

86-
proc bequal*(a, b: Int128): bool =
87+
proc `<=`*(a, b: Int128): bool =
8788
## Signed less-than-or-equal comparison.
8889
if cast[int64](a.hi) < cast[int64](b.hi): true
8990
elif a.hi == b.hi: a.lo <= b.lo
@@ -111,7 +112,7 @@ proc `*`*(a, b: Int128): Int128 =
111112
proc udivMod*(dividend, divisor: Int128): (Int128, Int128) =
112113
## Unsigned 128-integer division. Returns the quotient and
113114
## remainder.
114-
if divisor > dividend:
115+
if divisor >% dividend:
115116
return (Zero, dividend)
116117

117118
# shift-subtract algorithm (refer to
@@ -121,11 +122,11 @@ proc udivMod*(dividend, divisor: Int128): (Int128, Int128) =
121122
remainder = dividend
122123

123124
let digits = fastLog2(dividend) - fastLog2(divisor)
124-
var divisor = divisor shl digits.uint8
125+
var divisor = divisor shl digits
125126

126127
for _ in 0..digits:
127128
quotient = quotient shl 1
128-
if remainder >= divisor:
129+
if remainder >=% divisor:
129130
remainder = remainder - divisor
130131
quotient.lo = quotient.lo or 1 # left-shift 1 into the quotient
131132

@@ -148,7 +149,7 @@ proc divMod*(dividend, divisor: Int128): (Int128, Int128) =
148149
else:
149150
result = udivMod(dividend, divisor)
150151

151-
proc `/`*(a, b: Int128): Int128 =
152+
proc `div`*(a, b: Int128): Int128 =
152153
## Signed 128-bit truncating integer division.
153154
divMod(a, b)[0]
154155

tests/expr/spectest.nim

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -42,7 +42,6 @@ const
4242
"t02_mod_integer_values_4.test",
4343
"t02_mod_integer_values_div_by_zero.test",
4444
"t02_sub_float_values.test",
45-
"t02_sub_integer_values.test",
4645
"t02_sub_integer_values_overflow.test",
4746
"t02_tuple_constructor_1.test",
4847
"t02_tuple_constructor_2.test",

tests/unittest/README.md

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
Unit-like tests for modules.

tests/unittest/runner.txt

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
nim --outdir:build/tests --path:. ${args=c} -r ${file}

tests/unittest/tint128.nim

Lines changed: 213 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,213 @@
1+
discard """
2+
description: "Tests for the 128-bit integer implementation"
3+
"""
4+
import spec/int128
5+
6+
block parse_stringify_roundtrip:
7+
template test(str: string): bool = $parseInt128(str) == str
8+
9+
doAssert test("12345678987654321012345678987")
10+
doAssert test("0")
11+
# leading zeroes:
12+
doAssert $parseInt128("0001") == "1"
13+
doAssert $parseInt128("-0001") == "-1"
14+
doAssert $parseInt128("-0") == "0"
15+
# trailing zeroes:
16+
doAssert test("10")
17+
doAssert test("-10")
18+
19+
block negation:
20+
doAssert -toInt128(1) == toInt128(-1)
21+
doAssert -toInt128(0) == toInt128(0)
22+
23+
var d: array[39, Int128] ## array of powers of 10
24+
d[0] = parseInt128("1")
25+
d[1] = parseInt128("10")
26+
d[2] = parseInt128("100")
27+
d[3] = parseInt128("1000")
28+
d[4] = parseInt128("10000")
29+
d[5] = parseInt128("100000")
30+
d[6] = parseInt128("1000000")
31+
d[7] = parseInt128("10000000")
32+
d[8] = parseInt128("100000000")
33+
d[9] = parseInt128("1000000000")
34+
d[10] = parseInt128("10000000000")
35+
d[11] = parseInt128("100000000000")
36+
d[12] = parseInt128("1000000000000")
37+
d[13] = parseInt128("10000000000000")
38+
d[14] = parseInt128("100000000000000")
39+
d[15] = parseInt128("1000000000000000")
40+
d[16] = parseInt128("10000000000000000")
41+
d[17] = parseInt128("100000000000000000")
42+
d[18] = parseInt128("1000000000000000000")
43+
d[19] = parseInt128("10000000000000000000")
44+
d[20] = parseInt128("100000000000000000000")
45+
d[21] = parseInt128("1000000000000000000000")
46+
d[22] = parseInt128("10000000000000000000000")
47+
d[23] = parseInt128("100000000000000000000000")
48+
d[24] = parseInt128("1000000000000000000000000")
49+
d[25] = parseInt128("10000000000000000000000000")
50+
d[26] = parseInt128("100000000000000000000000000")
51+
d[27] = parseInt128("1000000000000000000000000000")
52+
d[28] = parseInt128("10000000000000000000000000000")
53+
d[29] = parseInt128("100000000000000000000000000000")
54+
d[30] = parseInt128("1000000000000000000000000000000")
55+
d[31] = parseInt128("10000000000000000000000000000000")
56+
d[32] = parseInt128("100000000000000000000000000000000")
57+
d[33] = parseInt128("1000000000000000000000000000000000")
58+
d[34] = parseInt128("10000000000000000000000000000000000")
59+
d[35] = parseInt128("100000000000000000000000000000000000")
60+
d[36] = parseInt128("1000000000000000000000000000000000000")
61+
d[37] = parseInt128("10000000000000000000000000000000000000")
62+
d[38] = parseInt128("100000000000000000000000000000000000000")
63+
64+
block add_sub_test:
65+
# test addition:
66+
var sum: Int128
67+
for it in d.items:
68+
sum = sum + it
69+
70+
doAssert $sum == "111111111111111111111111111111111111111"
71+
72+
# test subtraction:
73+
for it in d.items:
74+
sum = sum - it
75+
76+
doAssert sum == Zero
77+
78+
# test comparison, multiplication, and division with positive nubers:
79+
for i, a in d.pairs:
80+
for j, b in d.pairs:
81+
doAssert(cmp(a, b) == cmp(i, j))
82+
if i + j < d.len:
83+
doAssert a * b == d[i + j]
84+
if i - j >= 0:
85+
doAssert a div b == d[i - j]
86+
87+
# test comparison, multiplication, and division with negative nubers:
88+
for it in d.mitems:
89+
it = -it
90+
91+
for i, a in d.pairs:
92+
for j, b in d.pairs:
93+
doAssert(cmp(a, b) == -cmp(i, j))
94+
if i + j < d.len:
95+
doAssert a * b == -d[i + j]
96+
if i - j >= 0:
97+
doAssert a div b == -d[i - j]
98+
99+
block sign_test:
100+
# ake sure the sign of quotients, remainders, and products is correct
101+
let
102+
a = 100'i64
103+
b = 13
104+
105+
doAssert toInt128(a) * toInt128(0) == toInt128(0)
106+
doAssert toInt128(-a) * toInt128(0) == toInt128(0)
107+
108+
template compare(a, b): bool =
109+
divMod(toInt128(a), toInt128(b)) == (toInt128(a div b), toInt128(a mod b))
110+
111+
doAssert compare( a, b)
112+
doAssert compare(-a, b)
113+
doAssert compare(-a, -b)
114+
doAssert compare( a, -b)
115+
116+
doAssert compare( b, b)
117+
doAssert compare(-b, b)
118+
doAssert compare(-b, -b)
119+
doAssert compare( b, -b)
120+
121+
doAssert compare( b, a)
122+
doAssert compare(-b, a)
123+
doAssert compare(-b, -a)
124+
doAssert compare( b, -a)
125+
126+
# test logical left and right shift:
127+
128+
proc toHex(i: Int128): string =
129+
var val = i
130+
while val != Zero:
131+
let (q, r) = udivMod(val, toInt128(16))
132+
result.insert $"0123456789abcdef"[r.toInt]
133+
val = q
134+
135+
# pad to 32 characters:
136+
for _ in result.len..<32:
137+
result.insert "0"
138+
139+
let e = parseInt128("70997106675279150998592376708984375")
140+
let rshifted = [
141+
# toHex(e shr 0), toHex(e shr 1), toHex(e shr 2), toHex(e shr 3), ...
142+
"000dac6d782d266a37300c32591eee37", "0006d636bc1693351b9806192c8f771b", "00036b1b5e0b499a8dcc030c9647bb8d", "0001b58daf05a4cd46e601864b23ddc6",
143+
"0000dac6d782d266a37300c32591eee3", "00006d636bc1693351b9806192c8f771", "000036b1b5e0b499a8dcc030c9647bb8", "00001b58daf05a4cd46e601864b23ddc",
144+
"00000dac6d782d266a37300c32591eee", "000006d636bc1693351b9806192c8f77", "0000036b1b5e0b499a8dcc030c9647bb", "000001b58daf05a4cd46e601864b23dd",
145+
"000000dac6d782d266a37300c32591ee", "0000006d636bc1693351b9806192c8f7", "00000036b1b5e0b499a8dcc030c9647b", "0000001b58daf05a4cd46e601864b23d",
146+
"0000000dac6d782d266a37300c32591e", "00000006d636bc1693351b9806192c8f", "000000036b1b5e0b499a8dcc030c9647", "00000001b58daf05a4cd46e601864b23",
147+
"00000000dac6d782d266a37300c32591", "000000006d636bc1693351b9806192c8", "0000000036b1b5e0b499a8dcc030c964", "000000001b58daf05a4cd46e601864b2",
148+
"000000000dac6d782d266a37300c3259", "0000000006d636bc1693351b9806192c", "00000000036b1b5e0b499a8dcc030c96", "0000000001b58daf05a4cd46e601864b",
149+
"0000000000dac6d782d266a37300c325", "00000000006d636bc1693351b9806192", "000000000036b1b5e0b499a8dcc030c9", "00000000001b58daf05a4cd46e601864",
150+
"00000000000dac6d782d266a37300c32", "000000000006d636bc1693351b980619", "0000000000036b1b5e0b499a8dcc030c", "000000000001b58daf05a4cd46e60186",
151+
"000000000000dac6d782d266a37300c3", "0000000000006d636bc1693351b98061", "00000000000036b1b5e0b499a8dcc030", "0000000000001b58daf05a4cd46e6018",
152+
"0000000000000dac6d782d266a37300c", "00000000000006d636bc1693351b9806", "000000000000036b1b5e0b499a8dcc03", "00000000000001b58daf05a4cd46e601",
153+
"00000000000000dac6d782d266a37300", "000000000000006d636bc1693351b980", "0000000000000036b1b5e0b499a8dcc0", "000000000000001b58daf05a4cd46e60",
154+
"000000000000000dac6d782d266a3730", "0000000000000006d636bc1693351b98", "00000000000000036b1b5e0b499a8dcc", "0000000000000001b58daf05a4cd46e6",
155+
"0000000000000000dac6d782d266a373", "00000000000000006d636bc1693351b9", "000000000000000036b1b5e0b499a8dc", "00000000000000001b58daf05a4cd46e",
156+
"00000000000000000dac6d782d266a37", "000000000000000006d636bc1693351b", "0000000000000000036b1b5e0b499a8d", "000000000000000001b58daf05a4cd46",
157+
"000000000000000000dac6d782d266a3", "0000000000000000006d636bc1693351", "00000000000000000036b1b5e0b499a8", "0000000000000000001b58daf05a4cd4",
158+
"0000000000000000000dac6d782d266a", "00000000000000000006d636bc169335", "000000000000000000036b1b5e0b499a", "00000000000000000001b58daf05a4cd",
159+
"00000000000000000000dac6d782d266", "000000000000000000006d636bc16933", "0000000000000000000036b1b5e0b499", "000000000000000000001b58daf05a4c",
160+
"000000000000000000000dac6d782d26", "0000000000000000000006d636bc1693", "00000000000000000000036b1b5e0b49", "0000000000000000000001b58daf05a4",
161+
"0000000000000000000000dac6d782d2", "00000000000000000000006d636bc169", "000000000000000000000036b1b5e0b4", "00000000000000000000001b58daf05a",
162+
"00000000000000000000000dac6d782d", "000000000000000000000006d636bc16", "0000000000000000000000036b1b5e0b", "000000000000000000000001b58daf05",
163+
"000000000000000000000000dac6d782", "0000000000000000000000006d636bc1", "00000000000000000000000036b1b5e0", "0000000000000000000000001b58daf0",
164+
"0000000000000000000000000dac6d78", "00000000000000000000000006d636bc", "000000000000000000000000036b1b5e", "00000000000000000000000001b58daf",
165+
"00000000000000000000000000dac6d7", "000000000000000000000000006d636b", "0000000000000000000000000036b1b5", "000000000000000000000000001b58da",
166+
"000000000000000000000000000dac6d", "0000000000000000000000000006d636", "00000000000000000000000000036b1b", "0000000000000000000000000001b58d",
167+
"0000000000000000000000000000dac6", "00000000000000000000000000006d63", "000000000000000000000000000036b1", "00000000000000000000000000001b58",
168+
"00000000000000000000000000000dac", "000000000000000000000000000006d6", "0000000000000000000000000000036b", "000000000000000000000000000001b5",
169+
"000000000000000000000000000000da", "0000000000000000000000000000006d", "00000000000000000000000000000036", "0000000000000000000000000000001b",
170+
"0000000000000000000000000000000d", "00000000000000000000000000000006", "00000000000000000000000000000003", "00000000000000000000000000000001",
171+
"00000000000000000000000000000000", "00000000000000000000000000000000", "00000000000000000000000000000000", "00000000000000000000000000000000",
172+
"00000000000000000000000000000000", "00000000000000000000000000000000", "00000000000000000000000000000000", "00000000000000000000000000000000",
173+
"00000000000000000000000000000000", "00000000000000000000000000000000", "00000000000000000000000000000000", "00000000000000000000000000000000",
174+
]
175+
let lshifted = [
176+
# toHex(e shl 0), toHex(e shl 1), toHex(e shl 2), toHex(e shl 3), ...
177+
"000dac6d782d266a37300c32591eee37", "001b58daf05a4cd46e601864b23ddc6e", "0036b1b5e0b499a8dcc030c9647bb8dc", "006d636bc1693351b9806192c8f771b8",
178+
"00dac6d782d266a37300c32591eee370", "01b58daf05a4cd46e601864b23ddc6e0", "036b1b5e0b499a8dcc030c9647bb8dc0", "06d636bc1693351b9806192c8f771b80",
179+
"0dac6d782d266a37300c32591eee3700", "1b58daf05a4cd46e601864b23ddc6e00", "36b1b5e0b499a8dcc030c9647bb8dc00", "6d636bc1693351b9806192c8f771b800",
180+
"dac6d782d266a37300c32591eee37000", "b58daf05a4cd46e601864b23ddc6e000", "6b1b5e0b499a8dcc030c9647bb8dc000", "d636bc1693351b9806192c8f771b8000",
181+
"ac6d782d266a37300c32591eee370000", "58daf05a4cd46e601864b23ddc6e0000", "b1b5e0b499a8dcc030c9647bb8dc0000", "636bc1693351b9806192c8f771b80000",
182+
"c6d782d266a37300c32591eee3700000", "8daf05a4cd46e601864b23ddc6e00000", "1b5e0b499a8dcc030c9647bb8dc00000", "36bc1693351b9806192c8f771b800000",
183+
"6d782d266a37300c32591eee37000000", "daf05a4cd46e601864b23ddc6e000000", "b5e0b499a8dcc030c9647bb8dc000000", "6bc1693351b9806192c8f771b8000000",
184+
"d782d266a37300c32591eee370000000", "af05a4cd46e601864b23ddc6e0000000", "5e0b499a8dcc030c9647bb8dc0000000", "bc1693351b9806192c8f771b80000000",
185+
"782d266a37300c32591eee3700000000", "f05a4cd46e601864b23ddc6e00000000", "e0b499a8dcc030c9647bb8dc00000000", "c1693351b9806192c8f771b800000000",
186+
"82d266a37300c32591eee37000000000", "05a4cd46e601864b23ddc6e000000000", "0b499a8dcc030c9647bb8dc000000000", "1693351b9806192c8f771b8000000000",
187+
"2d266a37300c32591eee370000000000", "5a4cd46e601864b23ddc6e0000000000", "b499a8dcc030c9647bb8dc0000000000", "693351b9806192c8f771b80000000000",
188+
"d266a37300c32591eee3700000000000", "a4cd46e601864b23ddc6e00000000000", "499a8dcc030c9647bb8dc00000000000", "93351b9806192c8f771b800000000000",
189+
"266a37300c32591eee37000000000000", "4cd46e601864b23ddc6e000000000000", "99a8dcc030c9647bb8dc000000000000", "3351b9806192c8f771b8000000000000",
190+
"66a37300c32591eee370000000000000", "cd46e601864b23ddc6e0000000000000", "9a8dcc030c9647bb8dc0000000000000", "351b9806192c8f771b80000000000000",
191+
"6a37300c32591eee3700000000000000", "d46e601864b23ddc6e00000000000000", "a8dcc030c9647bb8dc00000000000000", "51b9806192c8f771b800000000000000",
192+
"a37300c32591eee37000000000000000", "46e601864b23ddc6e000000000000000", "8dcc030c9647bb8dc000000000000000", "1b9806192c8f771b8000000000000000",
193+
"37300c32591eee370000000000000000", "6e601864b23ddc6e0000000000000000", "dcc030c9647bb8dc0000000000000000", "b9806192c8f771b80000000000000000",
194+
"7300c32591eee3700000000000000000", "e601864b23ddc6e00000000000000000", "cc030c9647bb8dc00000000000000000", "9806192c8f771b800000000000000000",
195+
"300c32591eee37000000000000000000", "601864b23ddc6e000000000000000000", "c030c9647bb8dc000000000000000000", "806192c8f771b8000000000000000000",
196+
"00c32591eee370000000000000000000", "01864b23ddc6e0000000000000000000", "030c9647bb8dc0000000000000000000", "06192c8f771b80000000000000000000",
197+
"0c32591eee3700000000000000000000", "1864b23ddc6e00000000000000000000", "30c9647bb8dc00000000000000000000", "6192c8f771b800000000000000000000",
198+
"c32591eee37000000000000000000000", "864b23ddc6e000000000000000000000", "0c9647bb8dc000000000000000000000", "192c8f771b8000000000000000000000",
199+
"32591eee370000000000000000000000", "64b23ddc6e0000000000000000000000", "c9647bb8dc0000000000000000000000", "92c8f771b80000000000000000000000",
200+
"2591eee3700000000000000000000000", "4b23ddc6e00000000000000000000000", "9647bb8dc00000000000000000000000", "2c8f771b800000000000000000000000",
201+
"591eee37000000000000000000000000", "b23ddc6e000000000000000000000000", "647bb8dc000000000000000000000000", "c8f771b8000000000000000000000000",
202+
"91eee370000000000000000000000000", "23ddc6e0000000000000000000000000", "47bb8dc0000000000000000000000000", "8f771b80000000000000000000000000",
203+
"1eee3700000000000000000000000000", "3ddc6e00000000000000000000000000", "7bb8dc00000000000000000000000000", "f771b800000000000000000000000000",
204+
"eee37000000000000000000000000000", "ddc6e000000000000000000000000000", "bb8dc000000000000000000000000000", "771b8000000000000000000000000000",
205+
"ee370000000000000000000000000000", "dc6e0000000000000000000000000000", "b8dc0000000000000000000000000000", "71b80000000000000000000000000000",
206+
"e3700000000000000000000000000000", "c6e00000000000000000000000000000", "8dc00000000000000000000000000000", "1b800000000000000000000000000000",
207+
"37000000000000000000000000000000", "6e000000000000000000000000000000", "dc000000000000000000000000000000", "b8000000000000000000000000000000",
208+
"70000000000000000000000000000000", "e0000000000000000000000000000000", "c0000000000000000000000000000000", "80000000000000000000000000000000",
209+
]
210+
211+
for i in 0 ..< 128:
212+
doAssert rshifted[i] == toHex(e shr i)
213+
doAssert lshifted[i] == toHex(e shl i)

tools/tester.nim

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -360,7 +360,8 @@ if file.len == 0:
360360
# XXX: parallel execution of tests is still missing
361361
for (dir, runner) in dirs.items:
362362
for it in walkDir(dir, relative=false):
363-
if it.path.endsWith(".test"):
363+
if it.path.endsWith(".test") or
364+
(it.path.endsWith(".nim") and it.path.extractFilename.startsWith("t")):
364365
inc total
365366
if runTest(runner, it.path.relativePath(currDir)):
366367
inc success

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