Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/ast/check.go

@@ -0,0 +1,22 @@
+// Copyright 2017 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package ast
+
+import (
+	v1 "github.com/open-policy-agent/opa/v1/ast"
+)
+
+// UnificationErrDetail describes a type mismatch error when two values are
+// unified (e.g., x = [1,2,y]).
+type UnificationErrDetail = v1.UnificationErrDetail
+
+// RefErrUnsupportedDetail describes an undefined reference error where the
+// referenced value does not support dereferencing (e.g., scalars).
+type RefErrUnsupportedDetail = v1.RefErrUnsupportedDetail
+
+// RefErrInvalidDetail describes an undefined reference error where the referenced
+// value does not support the reference operand (e.g., missing object key,
+// invalid key type, etc.)
+type RefErrInvalidDetail = v1.RefErrInvalidDetail