Allow inherent_to_string_shadow_display for testing

Author: chansuke

tests/ui/to_string_in_display.rs

@@ -1,4 +1,5 @@
 #![warn(clippy::to_string_in_display)]
+#![deny(clippy::inherent_to_string_shadow_display)]
 
 use std::fmt;
 
@@ -29,11 +30,11 @@ fn fmt(a: A) {
     a.to_string();
 }
 
-pub struct C;
+struct C;
 
 impl C {
-    pub fn to_string(&self) -> String {
-        "I am C".to_string()
+    fn to_string(&self) -> &str {
+        "I am C"
     }
 }
 

tests/ui/to_string_in_display.stderr

@@ -1,27 +1,16 @@
 error: Using to_string in fmt::Display implementation might lead to infinite recursion
-  --> $DIR/to_string_in_display.rs:24:25
+  --> $DIR/to_string_in_display.rs:25:25
    |
 LL |         write!(f, "{}", self.to_string())
    |                         ^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::to-string-in-display` implied by `-D warnings`
 
-error: type `C` implements inherent method `to_string(&self) -> String` which shadows the implementation of `Display`
-  --> $DIR/to_string_in_display.rs:35:5
-   |
-LL | /     pub fn to_string(&self) -> String {
-LL | |         "I am C".to_string()
-LL | |     }
-   | |_____^
-   |
-   = note: `#[deny(clippy::inherent_to_string_shadow_display)]` on by default
-   = help: remove the inherent method from type `C`
-
 error: Using to_string in fmt::Display implementation might lead to infinite recursion
-  --> $DIR/to_string_in_display.rs:42:25
+  --> $DIR/to_string_in_display.rs:43:25
    |
 LL |         write!(f, "{}", self.to_string())
    |                         ^^^^^^^^^^^^^^^^
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors