diff --git a/cue/instance.go b/cue/instance.go
index f793d3c..d27db43 100644
--- a/cue/instance.go
+++ b/cue/instance.go
@@ -22,7 +22,6 @@
 	"cuelang.org/go/cue/errors"
 	"cuelang.org/go/cue/token"
 	"cuelang.org/go/internal"
-	"golang.org/x/exp/errors/fmt"
 )
 
 // An Instance defines a single configuration based on a collection of
@@ -295,9 +294,16 @@
 	value := convert(ctx, root, x)
 	eval := binOp(ctx, baseValue{}, opUnify, root, value)
 	// TODO: validate recursively?
-	st, ok := eval.(*structLit)
-	if !ok {
-		fmt.Errorf("structure at path did not resolve in struct")
+	err := inst.Err
+	var st *structLit
+	switch x := eval.(type) {
+	case *structLit:
+		st = x
+	default:
+		// This should not happen.
+		err = errors.Newf(x.Pos(), "error filling struct")
+	case *bottom:
+		err = inst.Value().toErr(x)
 	}
 	inst = &Instance{
 		rootStruct: st,
@@ -308,9 +314,9 @@
 		ImportPath: inst.ImportPath,
 		Name:       inst.Name,
 		Incomplete: inst.Incomplete,
-		Err:        inst.Err,
+		Err:        err,
 
-		complete: true,
+		complete: err != nil,
 	}
-	return inst, nil
+	return inst, err
 }
diff --git a/go.mod b/go.mod
index 578840c..79e49b3 100644
--- a/go.mod
+++ b/go.mod
@@ -17,7 +17,6 @@
 	github.com/retr0h/go-gilt v0.0.0-20190206215556-f73826b37af2
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/pflag v1.0.3
-	golang.org/x/exp/errors v0.0.0-20181221233300-b68661188fbf
 	golang.org/x/sync v0.0.0-20181108010431-42b317875d0f
 	golang.org/x/text v0.3.2
 	golang.org/x/tools v0.0.0-20181210225255-6a3e9aa2ab77
diff --git a/go.sum b/go.sum
index b33cf2f..5031a3f 100644
--- a/go.sum
+++ b/go.sum
@@ -53,8 +53,6 @@
 github.com/xeipuuv/gojsonpointer v0.0.0-20170225233418-6fe8760cad35/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
 github.com/xeipuuv/gojsonreference v0.0.0-20150808065054-e02fc20de94c/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
 github.com/xeipuuv/gojsonschema v0.0.0-20171230112544-511d08a359d1/go.mod h1:5yf86TLmAcydyeJq5YvxkGPE2fm/u4myDekKRoLuqhs=
-golang.org/x/exp/errors v0.0.0-20181221233300-b68661188fbf h1:4SQtY0VxhI0RZe/PFmCCfHyaPVuC5DgyXEqehsAWjwc=
-golang.org/x/exp/errors v0.0.0-20181221233300-b68661188fbf/go.mod h1:YgqsNsAu4fTvlab/7uiYK9LJrCIzKg/NiZUIH1/ayqo=
 golang.org/x/lint v0.0.0-20181011164241-5906bd5c48cd/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd h1:nTDtHvHSdCn1m6ITfMRqtOd/9+7a3s8RBNOZ3eYZzJA=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=