Add an example to the Configure trait

serde_test/src/de.rs

@@ -16,7 +16,6 @@ use token::Token;
 #[derive(Debug)]
 pub struct Deserializer<'de> {
     tokens: &'de [Token],
-    is_human_readable: Option<bool>,
 }
 
 macro_rules! assert_next_token {
@@ -49,13 +48,7 @@ macro_rules! end_of_tokens {
 
 impl<'de> Deserializer<'de> {
     pub fn new(tokens: &'de [Token]) -> Self {
-        Deserializer::readable(tokens, None)
-    }
-
-    // Not public API
-    #[doc(hidden)]
-    pub fn readable(tokens: &'de [Token], is_human_readable: Option<bool>) -> Self {
-        Deserializer { tokens: tokens, is_human_readable: is_human_readable }
+        Deserializer { tokens: tokens }
     }
 
     fn peek_token_opt(&self) -> Option<Token> {
@@ -373,15 +366,10 @@ impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
     }
 
     fn is_human_readable(&self) -> bool {
-        match self.is_human_readable {
-            Some(is) => is,
-            None => {
-                panic!("There is no serde_test API currently for testing types \
-                        that have different human-readable and compact \
-                        representation. See \
-                        https://github.com/serde-rs/serde/issues/1065.");
-            }
-        }
+        panic!(
+            "Types which have different human-readable and compact representations\
+             must explicitly mark their test cases with `serde_test::Configure`"
+        );
     }
 }