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Change to Object Expressions in 1.9.6.16
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I am confused about a change made to object expressions in 1.9.6.16.

Previously, we were able to differentiate between similar record types like so:

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type A = { Foo : int }
type B = { Foo : int }
let a = { new A with Foo = 1 }

With 1.9.6.16, this generates a warning:

warning FS0035: This construct is deprecated: This form of object expression is deprecated. Use 'member this.MemberName ... = ...' to define member implementations in object expressions.

But if I rewrite my example as:

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type A = { Foo : int }
type B = { Foo : int }
let a = { new A with member this.Foo = 1 }

I get the seemingly contradictory error:

error FS0191: Only simple bindings of the form 'id = expr' can be used in construction expressions

Am I doing something wrong? Can anyone offer me some advice? Thanks!

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Can't answer those specific warnings or errors but you can accomplish

the same assignment with either of these two forms. And it's less

typing...

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let a = { Foo = 1 } : A


let a:A = { Foo = 1 }
By on 5/21/2009 7:19 AM ()Reply
Hide this comment

Can't answer those specific warnings or errors but you can accomplish

the same assignment with either of these two forms.

That was very helpful! Thanks so much! =)

By on 5/21/2009 7:29 AM ()Reply

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