concept cannot be overloaded with var concept

[dawkot]

So this is valid code:

func foo(x: int): int = x
func foo(x: var int): var int = x
var x = 0
discard foo x

But this isn't:

type Foo = concept foo
func foo(x: Foo): Foo = x
func foo(x: var Foo): var Foo = x
var x = 0
discard foo x

Error: ambiguous call; both inim_1542378399.foo(x: Foo)[declared in inim_1542378399.nim(4, 5)] and inim_1542378399.foo(x: var Foo)[declared in inim_1542378399.nim(5, 5)] match for: (int)

[krux02]

My personal opinion is, don't use concepts, they currently cause more problems than they solve. But yes, this is bad.