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discard """
targets: "c cpp"
output: "1"
"""
proc viewInto(a: array[4, string]): lent string =
result = a[0]
proc passToVar(x: var string) =
discard
proc main =
let x = ["1", "2", "3", "4"]
echo viewInto(x)
doAssert(not compiles(passToVar(viewInto(x))))
main()
#------------------------------------------------------------------------------
# issue #15958
block:
proc byLent[T](a: T): lent T = a
let a = [11,12]
let b = @[21,23]
let ss = {1, 2, 3, 5}
doAssert byLent(a) == [11,12]
doAssert byLent(a).unsafeAddr == a.unsafeAddr
doAssert byLent(b) == @[21,23]
doAssert byLent(b).unsafeAddr == b.unsafeAddr
doAssert byLent(ss) == {1, 2, 3, 5}
doAssert byLent(ss).unsafeAddr == ss.unsafeAddr
let r = new(float)
r[] = 10.0
doAssert byLent(r)[] == 10.0
let p = create(float)
p[] = 20.0
doAssert byLent(p)[] == 20.0
proc byLent2[T](a: openarray[T]): lent T = a[0]
doAssert byLent2(a) == 11
doAssert byLent2(a).unsafeAddr == a[0].unsafeAddr
doAssert byLent2(b) == 21
doAssert byLent2(b).unsafeAddr == b[0].unsafeAddr
proc byLent3[T](a: varargs[T]): lent T = a[1]
let
x = 10
y = 20
z = 30
doAssert byLent3(x, y, z) == 20
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