Nim/tests/overload/toverload_issues.nim

discard """
  output: '''
Version 2 was called.
This has the highest precedence.
This has the second-highest precedence.
This has the lowest precedence.
baseobj ==
true
even better! ==
true
done extraI=0
test 0 complete, loops=0
done extraI=1
test 1.0 complete, loops=1
done extraI=0
done extraI passed 0
test no extra complete, loops=2
1
'''
"""


# issue 4675
import importA  # comment this out to make it work
import importB

var x: Foo[float]
var y: Foo[float]
let r = t1(x) + t2(y)



# Bug: https://github.com/nim-lang/Nim/issues/4475
# Fix: https://github.com/nim-lang/Nim/pull/4477
proc test(x: varargs[string], y: int) = discard
test(y = 1)



# bug #2220
when true:
  type A[T] = object
  type B = A[int]

  proc q[X](x: X) =
    echo "Version 1 was called."

  proc q(x: B) =
    echo "Version 2 was called."

  q(B()) # This call reported as ambiguous.



# bug #2219
template testPred(a: untyped) =
  block:
    type A = object of RootObj
    type B = object of A
    type SomeA = A|A # A hack to make "A" a typeclass.

    when a >= 3:
      proc p[X: A](x: X) =
        echo "This has the highest precedence."
    when a == 2:
      proc p[X: SomeA](x: X) =
        echo "This has the second-highest precedence."
    when a >= 1:
      proc p[X](x: X) =
        echo "This has the lowest precedence."

    p(B())

testPred(3)
testPred(2)
testPred(1)



# bug #6526
type
  BaseObj = ref object of RootObj
  DerivedObj = ref object of BaseObj
  OtherDerivate = ref object of BaseObj

proc `==`*[T1, T2: BaseObj](a: T1, b: T2): bool =
  echo "baseobj =="
  return true

let a = DerivedObj()
let b = DerivedObj()
echo a == b

proc `==`*[T1, T2: OtherDerivate](a: T1, b: T2): bool =
  echo "even better! =="
  return true

let a2 = OtherDerivate()
let b2 = OtherDerivate()
echo a2 == b2



# bug #2481
import math

template test(loopCount: int, extraI: int, testBody: untyped): typed =
  block:
    for i in 0..loopCount-1:
      testBody
    echo "done extraI=", extraI

template test(loopCount: int, extraF: float, testBody: untyped): typed =
  block:
    test(loopCount, round(extraF).int, testBody)

template test(loopCount: int, testBody: untyped): typed =
  block:
    test(loopCount, 0, testBody)
    echo "done extraI passed 0"

var
  loops = 0

test 0, 0:
  loops += 1
echo "test 0 complete, loops=", loops

test 1, 1.0:
  loops += 1
echo "test 1.0 complete, loops=", loops

when true:
  # when true we get the following compile time error:
  #   b.nim(35, 6) Error: expression 'loops += 1' has no type (or is ambiguous)
  loops = 0
  test 2:
    loops += 1
  echo "test no extra complete, loops=", loops

# bug #2229
type
  Type1 = object
    id: int
  Type2 = object
    id: int

proc init(self: var Type1, a: int, b: ref Type2) =
  echo "1"

proc init(self: var Type2, a: int) =
  echo """
    Works when this proc commented out
    Otherwise error:
    test.nim(14, 4) Error: ambiguous call; both test.init(self: var Type1, a: int, b: ref Type2) and test.init(self: var Type1, a: int, b: ref Type2) match for: (Type1, int literal(1), ref Type2)
  """

var aa: Type1
init(aa, 1, (
    var bb = new(Type2);
    bb
))



# bug #4545
type
  SomeObject = object
    a: int
  AbstractObject = object
    objet: ptr SomeObject

proc convert(this: var SomeObject): AbstractObject =
  AbstractObject(objet: this.addr)

proc varargProc(args: varargs[AbstractObject, convert]): int =
  for arg in args:
    result += arg.objet.a

var obj = SomeObject(a: 17)
discard varargProc(obj)



# bug #11239

type MySeq*[T] = object

proc foo(a: seq[int]): string = "foo: seq[int]"
proc foo[T](a: seq[T]): string = "foo: seq[T]"
proc foo(a: MySeq[int]): string = "foo: MySeq[int]"
proc foo[T](a: MySeq[T]): string = "foo: MySeq[T]"

doAssert foo(@[1,2,3]) == "foo: seq[int]"
doAssert foo(@["WER"]) == "foo: seq[T]"
doAssert foo(MySeq[int]()) == "foo: MySeq[int]"
doAssert foo(MySeq[string]()) == "foo: MySeq[T]"