File: t19730.nim

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nim 1.6.10-2
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discard """
  output: '''1.01.01.01.0
1.01.01.01.0
'''
"""

type
  Color = concept c
    c.r is SomeFloat
    c.g is SomeFloat
    c.b is SomeFloat
    c.a is SomeFloat

proc useColor(color: Color) =
  echo(color.r, color.g, color.b, color.a)

let color = (r: 1.0, g: 1.0, b: 1.0, a: 1.0)
useColor(color)

useColor((r: 1.0, g: 1.0, b: 1.0, a: 1.0))