dotcall mismatch

[fowlmouth]

/tmp/aporia/a27.nim(9, 8) Error: type mismatch: got (int, int)
but expected one of:
a27.()(l: string, r: string): string

var x: int

proc foo (some:int):int = some
when true:
  proc `()` (l,r:string): string = nil

block:
  var foo = 42
  echo x.foo

works when no () is defined

[data-man]

Nim-devel now outputs

(9, 9) Error: type mismatch: got <int, int>
but expected one of: 
proc `()`(l, r: string): string
  first type mismatch at position: 1
  required type: string
  but expression 'foo' is of type: int