diff --git a/oracle/testdata/src/main/describe-json.go b/oracle/testdata/src/main/describe-json.go
index 7e4220e1..56c29321 100644
--- a/oracle/testdata/src/main/describe-json.go
+++ b/oracle/testdata/src/main/describe-json.go
@@ -9,6 +9,7 @@ package describe // @describe pkgdecl "describe"
 func main() { //
 	var s struct{ x [3]int }
 	p := &s.x[0] // @describe desc-val-p "p"
+	_ = p
 
 	var i I = C(0)
 	if i == nil {
diff --git a/oracle/testdata/src/main/describe-json.golden b/oracle/testdata/src/main/describe-json.golden
index a9050881..e2b26182 100644
--- a/oracle/testdata/src/main/describe-json.golden
+++ b/oracle/testdata/src/main/describe-json.golden
@@ -11,36 +11,36 @@
 				{
 					"name": "C",
 					"type": "int",
-					"pos": "testdata/src/main/describe-json.go:26:6",
+					"pos": "testdata/src/main/describe-json.go:27:6",
 					"kind": "type",
 					"methods": [
 						{
 							"name": "method (describe.C) f()",
-							"pos": "testdata/src/main/describe-json.go:29:12"
+							"pos": "testdata/src/main/describe-json.go:30:12"
 						}
 					]
 				},
 				{
 					"name": "D",
 					"type": "struct{}",
-					"pos": "testdata/src/main/describe-json.go:27:6",
+					"pos": "testdata/src/main/describe-json.go:28:6",
 					"kind": "type",
 					"methods": [
 						{
 							"name": "method (*describe.D) f()",
-							"pos": "testdata/src/main/describe-json.go:30:13"
+							"pos": "testdata/src/main/describe-json.go:31:13"
 						}
 					]
 				},
 				{
 					"name": "I",
 					"type": "interface{f()}",
-					"pos": "testdata/src/main/describe-json.go:22:6",
+					"pos": "testdata/src/main/describe-json.go:23:6",
 					"kind": "type",
 					"methods": [
 						{
 							"name": "method (describe.I) f()",
-							"pos": "testdata/src/main/describe-json.go:23:2"
+							"pos": "testdata/src/main/describe-json.go:24:2"
 						}
 					]
 				},
@@ -59,15 +59,15 @@
 	"implements": [
 		{
 			"i": "describe.I",
-			"ipos": "testdata/src/main/describe-json.go:22:6",
+			"ipos": "testdata/src/main/describe-json.go:23:6",
 			"c": "describe.C",
-			"cpos": "testdata/src/main/describe-json.go:26:6"
+			"cpos": "testdata/src/main/describe-json.go:27:6"
 		},
 		{
 			"i": "describe.I",
-			"ipos": "testdata/src/main/describe-json.go:22:6",
+			"ipos": "testdata/src/main/describe-json.go:23:6",
 			"c": "*describe.D",
-			"cpos": "testdata/src/main/describe-json.go:27:6"
+			"cpos": "testdata/src/main/describe-json.go:28:6"
 		}
 	]
 }-------- @describe desc-val-p --------
@@ -98,25 +98,25 @@
 	"mode": "describe",
 	"describe": {
 		"desc": "identifier",
-		"pos": "testdata/src/main/describe-json.go:17:6",
+		"pos": "testdata/src/main/describe-json.go:18:6",
 		"detail": "value",
 		"value": {
 			"type": "describe.I",
-			"objpos": "testdata/src/main/describe-json.go:13:6",
+			"objpos": "testdata/src/main/describe-json.go:14:6",
 			"pts": [
 				{
 					"type": "*describe.D",
-					"namepos": "testdata/src/main/describe-json.go:27:6",
+					"namepos": "testdata/src/main/describe-json.go:28:6",
 					"labels": [
 						{
-							"pos": "testdata/src/main/describe-json.go:15:10",
+							"pos": "testdata/src/main/describe-json.go:16:10",
 							"desc": "new"
 						}
 					]
 				},
 				{
 					"type": "describe.C",
-					"namepos": "testdata/src/main/describe-json.go:26:6"
+					"namepos": "testdata/src/main/describe-json.go:27:6"
 				}
 			]
 		}
@@ -126,7 +126,7 @@
 	"mode": "describe",
 	"describe": {
 		"desc": "go statement",
-		"pos": "testdata/src/main/describe-json.go:19:2",
+		"pos": "testdata/src/main/describe-json.go:20:2",
 		"detail": "unknown"
 	}
 }-------- @describe desc-type-C --------
@@ -134,16 +134,16 @@
 	"mode": "describe",
 	"describe": {
 		"desc": "definition of type describe.C",
-		"pos": "testdata/src/main/describe-json.go:26:6",
+		"pos": "testdata/src/main/describe-json.go:27:6",
 		"detail": "type",
 		"type": {
 			"type": "describe.C",
-			"namepos": "testdata/src/main/describe-json.go:26:6",
+			"namepos": "testdata/src/main/describe-json.go:27:6",
 			"namedef": "int",
 			"methods": [
 				{
 					"name": "method (describe.C) f()",
-					"pos": "testdata/src/main/describe-json.go:29:12"
+					"pos": "testdata/src/main/describe-json.go:30:12"
 				}
 			]
 		}
diff --git a/oracle/testdata/src/main/describe.go b/oracle/testdata/src/main/describe.go
index 7d3c407f..b7fe77ad 100644
--- a/oracle/testdata/src/main/describe.go
+++ b/oracle/testdata/src/main/describe.go
@@ -53,6 +53,7 @@ func main() { // @describe func-def-main "main"
 	// type objects
 	type T int      // @describe type-def-T "T"
 	var three T = 3 // @describe type-ref-T "T"
+	_ = three
 
 	print(1 + 2*3)        // @describe const-expr " 2.3"
 	print(real(1+2i) - 3) // @describe const-expr2 "real.*3"
@@ -70,6 +71,7 @@ func deadcode() {
 	var a int // @describe var-decl-stmt "var a int"
 	// Pointer analysis can't run on dead code.
 	var b = &a // @describe b "b"
+	_ = b
 }
 
 type I interface { // @describe def-iface-I "I"