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discard """
output: '''
it's nil
@[1, 2, 3]
'''
"""
import macros
block anontuples:
proc `^` (a, b: int): int =
result = 1
for i in 1..b: result = result * a
var m = (0, 5)
var n = (56, 3)
m = (n[0] + m[1], m[1] ^ n[1])
doAssert m == (61, 125)
# also test we can produce unary anon tuples in a macro:
macro mm(): untyped =
result = newTree(nnkTupleConstr, newLit(13))
proc nowTuple(): (int,) =
result = (0,)
doAssert nowTuple() == (Field0: 0)
doAssert mm() == (Field0: 13)
block unpack_asgn:
proc foobar(): (int, int) = (2, 4)
# test within a proc:
proc pp(x: var int) =
var y: int
(y, x) = foobar()
template pt(x) =
var y: int
(x, y) = foobar()
# test within a generic:
proc pg[T](x, y: var T) =
pt(x)
# test as a top level statement:
var x, y, a, b: int
# test for regression:
(x, y) = (1, 2)
(x, y) = fooBar()
doAssert x == 2
doAssert y == 4
pp(a)
doAssert a == 4
pg(a, b)
doAssert a == 2
doAssert b == 0
block unpack_const:
const (a, ) = (1, )
doAssert a == 1
const (b, c) = (2, 3)
doAssert b == 2
doAssert c == 3
# bug #10098
const (x, y, z) = (4, 5, 6)
doAssert x == 4
doAssert y == 5
doAssert z == 6
# bug #10724
block unpack_const_named:
const (a, ) = (x: 1, )
doAssert a == 1
const (b, c) = (x: 2, y: 3)
doAssert b == 2
doAssert c == 3
const (d, e, f) = (x: 4, y: 5, z: 6)
doAssert d == 4
doAssert e == 5
doAssert f == 6
block const_named:
const x = block:
(a: 1, b: 2, c: 3)
doAssert x.a == 1
doAssert x.b == 2
doAssert x.c == 3
block tuple_subscript:
proc`[]` (t: tuple, key: string): string =
for name, field in fieldPairs(t):
if name == key:
return $field
return ""
proc`[]` [A,B](t: tuple, key: string, op: (proc(x: A): B)): B =
for name, field in fieldPairs(t):
when field is A:
if name == key:
return op(field)
proc`[]=`[T](t: var tuple, key: string, val: T) =
for name, field in fieldPairs(t):
when field is T:
if name == key:
field = val
var tt = (a: 1, b: "str1")
# test built in operator
tt[0] = 5
doAssert tt[0] == 5
doAssert `[]`(tt, 0) == 5
# test overloaded operator
tt["b"] = "str2"
doAssert tt["b"] == "str2"
doAssert `[]`(tt, "b") == "str2"
doAssert tt["b", proc(s: string): int = s.len] == 4
block tuple_with_seq:
template foo(s: string = "") =
if s.len == 0:
echo "it's nil"
else:
echo s
foo
# bug #2632
proc takeTup(x: tuple[s: string;x: seq[int]]) =
discard
takeTup(("foo", @[]))
#proc foobar(): () =
proc f(xs: seq[int]) =
discard
proc g(t: tuple[n:int, xs:seq[int]]) =
discard
when true:
f(@[]) # OK
g((1,@[1])) # OK
g((0,@[])) # NG
# bug #2630
type T = tuple[a: seq[int], b: int]
var t: T = (@[1,2,3], 7)
proc test(s: seq[int]): T =
echo s
(s, 7)
t = test(t.a)
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