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discard """
output: '''XY is Node
MyGraph is Graph'''
"""
# bug #3452
import math
type
Node* = concept n
`==`(n, n) is bool
Graph* = concept g
var x: Node
distance(g, x, x) is float
XY* = tuple[x, y: int]
MyGraph* = object
points: seq[XY]
if XY is Node:
echo "XY is Node"
proc distance*( g: MyGraph, a, b: XY): float =
sqrt( pow(float(a.x - b.x), 2) + pow(float(a.y - b.y), 2) )
if MyGraph is Graph:
echo "MyGraph is Graph"
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