nim never terminates and keep write to stderr

[ianfun]

The nim program keeps throwing up errors when I was using sublime-text building source

I was trying concept keyword

In nim playground, process was killed

In sublime-text, process never died (more then 1 minute)

In Terminal, window terminal almost crashed

source

type
  Ordering = enum Lower= -1, Equal=0, Greater=1
  Eq = concept a
    a == a is bool
    a /= a is bool
  Ord = concept o
    compare o o is Ordering
    o < o is bool
    o > o is bool
    o <= o is bool
    o >= o is bool
    max o, o is o
    min o, o is o

when isMainModule:
  type SubClass* = object
    real: float

  func min(x, y: Ord): Ord {.inline.} =
    if x <= y: x else: y

  func max(x, y: Ord): Ord {.inline.} =
    if y <= x: x else: y
  
  func `>=`(x, y: Ord): bool = x > y and x==y
  
  func `<=`(x, y: Ord): bool = x < y and x==y
  
  func `==`(a, b: SubClass): bool = a.real == b.real
  
  func `>`(a, b: SubClass): bool = a.real > b.real
  
  func `<`(a, b: SubClass): bool = a.real < b.real
  
  func compare(a, b: SubClass): Ordering = 
    if a < b:
      Lower
    elif a > b:
      Greater
    else:
      Equal
  let 
    a = SubClass(real: 21)
    b=SubClass(real: 23.1)
  echo a==b
  echo compare(a, b)
  echo max(a, b)  

command line

nim c foo.nim

Current Output

repeat forever...

version

Nim Compiler Version 1.6.2 [Windows: amd64]
Compiled at 2021-12-17
Copyright (c) 2006-2021 by Andreas Rumpf

active boot switches: -d:release

also test in 1.6.0