More accurately report text parsing failures for invalid strings.
diff --git a/proto/text_parser_test.go b/proto/text_parser_test.go
index cfc0db6..0754b26 100644
--- a/proto/text_parser_test.go
+++ b/proto/text_parser_test.go
@@ -152,7 +152,7 @@
 	// Bad quoted string
 	{
 		in:  `inner: < host: "\0" >` + "\n",
-		err: `line 1.15: invalid quoted string "\0"`,
+		err: `line 1.15: invalid quoted string "\0": \0 requires 2 following digits`,
 	},
 
 	// Number too large for int64