What
The following code leads to the resulting misleading error message: -
type Person() =
member val Name = "" with get,set
member val Age = 0 with get,set
let p =
Person(Name = "Fred"
Age = 18)error FS0501: The member or object constructor 'Person' takes 0 argument(s) but is here given 1. The required signature is 'new : unit -> Person'
Why
The error above gets confused - it firstly assumes that we're trying to call a constructor with arguments when in fact we're trying to set properties on the object. Also it suggests 1 argument is provided but as far as the developer is concerned they have provided 2. The last point is that the error has nothing to do with this - it's simply that we've missed out the , between the two property assignments.
How
I'm not entirely sure what the real syntax error should be - let's start by my suggesting rewording the error to something like this: -
Syntax error. Were you trying to set the value of multiple properties on the object with object initializer syntax? If so, consider separating arguments with a ,.
What
The following code leads to the resulting misleading error message: -
error FS0501: The member or object constructor 'Person' takes 0 argument(s) but is here given 1. The required signature is 'new : unit -> Person'Why
The error above gets confused - it firstly assumes that we're trying to call a constructor with arguments when in fact we're trying to set properties on the object. Also it suggests 1 argument is provided but as far as the developer is concerned they have provided 2. The last point is that the error has nothing to do with this - it's simply that we've missed out the
,between the two property assignments.How
I'm not entirely sure what the real syntax error should be - let's start by my suggesting rewording the error to something like this: -
Syntax error. Were you trying to set the value of multiple properties on the object with object initializer syntax? If so, consider separating arguments with a ,.