regression in discard statement

[cooldome]

Regression introduced recently, the following valid code snippet no longer compiles

type
  ErrorHandler = proc(e: int): string {.nimcall.}

var handler: ErrorHandler

proc setHandler(newHandler: ErrorHandler): ErrorHandler =
  ## returns previous error handler
  result = handler
  handler = newHandler

proc myHandler(e: int): string =
  $e

discard setHandler(myHandler)

@krux02:
Regression introduced in 16353c2

[Araq]

@krux02 Told ya you should check for n.sym in routineKinds.