Cue: Detect references with unifications (#1065)

Author: spinillos

internal/jennies/golang/templates/types/disjunction_of_refs.json_unmarshal.tmpl

@@ -1,5 +1,4 @@
 {{- $json := importStdPkg "encoding/json" -}}
-{{- $errors := importStdPkg "errors" -}}
 {{- $struct := .def.Type.Struct -}}
 // UnmarshalJSON implements a custom JSON unmarshalling logic to decode `{{ .def.Name|formatObjectName }}` from JSON.
 func (resource *{{ .def.Name|formatObjectName }}) UnmarshalJSON(raw []byte) error {

internal/simplecue/generator.go

@@ -446,6 +446,13 @@ func getReference(v cue.Value) (bool, cue.Value, cue.Value) {
 	if op == cue.AndOp && exprs[0].Subsume(exprs[1]) == nil && exprs[1].Subsume(exprs[0]) == nil {
 		return true, exprs[0], exprs[1]
 	}
+
+	// We could have a reference unified with a cue.TopKind (_). We can assume that if we have an existing path unified with this
+	// it's a valid reference.
+	if path.String() != "" && exprs[1].IncompleteKind() == cue.TopKind {
+		return true, exprs[0], exprs[0]
+	}
+
 	return false, v, v
 }