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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!

.

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 ()

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 ()

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