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Nesting Parameters-- "precondition analysis failed"?

dave_cowdendave_cowden Member, Developers Posts: 465 ✭✭✭
I'm trying to use a feature to conditionally define other features. I see this done in many of the std features, but I get an error "precondition analysis failed" when using the pattern myself.

Why does this code produce "precondition analysis failed"? 
export enum AnsiOringType{
    annotation { "Name" : "AS568-001" }
    annotation { "Name" : "AS568-002" }
    annotation { "Name" : "AS568-003" }
    //and 932 more :(

export enum LocationOffsetType{
    annotation{ "Name" : "Offset From Plane" }
    annotation{ "Name" : "On Plane" }
    //annotation{ "Name" : "Vertex" }
export const oRing = defineFeature(function(context is Context, id is Id, definition is map)
        annotation { "Name" : "ANSI TYPE" }
        definition.ansiType is AnsiOringType;
        annotation { "Name" : "CylindricalFace", "Filter" : EntityType.FACE, "MaxNumberOfPicks" : 1 }
        definition.referenceFace is Query;
        annotation { "Name" : "LocationType" }
        definition.locationType is LocationOffsetType;
        annotation { "Name" : "ReferencePlane" }
        definition.refPlane is Query;           
         //the conditional definition here is what causes the error. //builtin features do this., but here it doesn't work?
        if ( definition.locationType == LocationOffsetType.PLANE_OFFSET ){
            annotation { "Name" : "OffSet" }
            isLength(definition.offset, LENGTH_BOUNDS);            

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