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discard """
file: "tmultim1.nim"
output: "7"
"""
# Test multi methods
type
Expression = ref object {.inheritable.}
Literal = ref object of Expression
x: int
PlusExpr = ref object of Expression
a, b: Expression
method eval(e: Expression): int = quit "to override!"
method eval(e: Literal): int = return e.x
method eval(e: PlusExpr): int = return eval(e.a) + eval(e.b)
proc newLit(x: int): Literal =
new(result)
result.x = x
proc newPlus(a, b: Expression): PlusExpr =
new(result)
result.a = a
result.b = b
echo eval(newPlus(newPlus(newLit(1), newLit(2)), newLit(4))) #OUT 7
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