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ShouldMatchers not work for objects with length and size

3 replies on 1 page. Most recent reply: Oct 18, 2012 7:48 PM by Bill Venners

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Uwe Doerl

Posts: 1
Nickname: grayal
Registered: May, 2012

ShouldMatchers not work for objects with length and size Posted: May 12, 2012 5:21 AM
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I got a compiler error on objects with both implemented methods length and size.

object should be ...

type mismatch; found: expect.type (..) required: ?{val should(x$1: ?>: org.scalatest.matchers.Matcher[Any] <: Any): ?}
Note that implicit conversions are not applicable because they are ambiguous:
both method convertHasIntLengthFieldToLengthShouldWrapper in trait ShouldMatchers of type [T <: AnyRef{val length: Int}](o: T)PathTest.this.LengthShouldWrapper[T]
and method convertHasIntSizeFieldToSizeShouldWrapper in trait ShouldMatchers of type [T <: AnyRef{val size: Int}](o: T)PathTest.this.SizeShouldWrapper[T]
are possible conversion functions from expect.type to ?{val should(x$1: ?>: org.scalatest.matchers.Matcher[Any] <: Any): ?}


Each class with trait scala.collection.SeqLike[+A, +Repr] contains both methods!


Bill Venners

Posts: 2284
Nickname: bv
Registered: Jan, 2002

Re: ShouldMatchers not work for objects with length and size Posted: May 12, 2012 10:36 AM
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That's odd. I'll try that and see what's up.

John Kurkowski

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Nickname: bluu
Registered: Oct, 2012

Re: ShouldMatchers not work for objects with length and size Posted: Oct 18, 2012 3:00 PM
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Any luck with this?

Bill Venners

Posts: 2284
Nickname: bv
Registered: Jan, 2002

Re: ShouldMatchers not work for objects with length and size Posted: Oct 18, 2012 7:48 PM
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Hi John,

Sorry, I think I forgot about this one. But I think I understand it. We have structural type implicit conversions, and they are causing problems if an object's structure fits both. Although I said it before, I *will* check into it.

Bill

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