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Downcasting int literals to bytes and shorts does not work on overloaded methods #6708

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scabug opened this issue Nov 24, 2012 · 2 comments
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Downcasting int literals to bytes and shorts does not work on overloaded methods #6708

scabug opened this issue Nov 24, 2012 · 2 comments
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should compile usability won't fix

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@scabug
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scabug commented Nov 24, 2012

def f(x: Byte, b: Boolean) = x
def f(x: Byte, b: Int) = x

f(4, true)

errors out with:
Main.scala:5: error: overloaded method value f with alternatives:
(x: Byte,b: Int)Byte
(x: Byte,b: Boolean)Byte
cannot be applied to (Int, Boolean)
f(4, true)
^
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scabug commented Nov 24, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6708?orig=1
Reporter: Mark Hammons (markehammons)
Affected Versions: 2.9.2

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scabug commented Nov 24, 2012

@paulp said:
This is not really a bug, although I can see why it would feel like one. 4 is an Int, not a Byte. A literal Int within the Byte range will be converted to a Byte if the expected type is Byte, but once you overload the method you lose that condition. It may be obvious in this case to the casual human observer that the first argument has to be a Byte, but in the general case analyzing overloads for expected types would be expensive, complicated, and typically fail to deliver the goods anyway.

If you're not aware, this works: f(4: Byte, true).

@scabug scabug closed this as completed Nov 24, 2012
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