Confusing error message for invalid member declaration

When the name of a member is incorrectly enclosed in parentheses, the error message is confusing.

For example, this code:

type T =
    static member (x) = 0

Causes the error:

Only simple variable patterns can be bound in 'let rec' constructs

This is confusing, because the code above doesn't contain any let rec constructs.

This also happens when a type annotation is included in the parentheses, e.g.:

static member (x:int) = 0

I think a simple way to fix this would be to change the error message in this case to:

Only simple variable patterns can be bound in 'member' constructs

I noticed this when looking at this Stack Overflow question.

@isaacabraham

@isaacabraham Please add to your improved error messages catalog? thanks

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