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discard """
targets: "c cpp js"
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()
template main2 = # bug #15958
when defined(js):
proc sameAddress[T](a, b: T): bool {.importjs: "(# === #)".}
else:
template sameAddress(a, b): bool = a.unsafeAddr == b.unsafeAddr
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 sameAddress(byLent(a), a)
doAssert byLent(b) == @[21,23]
# bug #16073
doAssert sameAddress(byLent(b), b)
doAssert byLent(ss) == {1, 2, 3, 5}
doAssert sameAddress(byLent(ss), ss)
let r = new(float)
r[] = 10.0
# bug #16073
doAssert byLent(r)[] == 10.0
when not defined(js): # pending bug https://github.com/timotheecour/Nim/issues/372
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 sameAddress(byLent2(a), a[0])
doAssert byLent2(b) == 21
doAssert sameAddress(byLent2(b), b[0])
proc byLent3[T](a: varargs[T]): lent T = a[1]
let
x = 10
y = 20
z = 30
doAssert byLent3(x, y, z) == 20
main2()
when false:
# bug: Error: unhandled exception: 'node' is not accessible using discriminant 'kind' of type 'TFullReg' [FieldDefect]
static: main2()
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