Add test for new proc_macro literal methods

Author: GuillaumeGomez

literal-escaper/README.md

@@ -1,4 +1,4 @@
 # literal-escaper
 
 This crate provides code to unescape string literals. It is used by `rustc_lexer`
-and `proc-macro`.
+and `proc_macro`.

proc_macro/src/lib.rs

@@ -61,6 +61,7 @@ use crate::escape::{EscapeOptions, escape_bytes};
 
 /// Errors returned when trying to retrieve a literal unescaped value.
 #[unstable(feature = "proc_macro_value", issue = "136652")]
+#[derive(Debug, PartialEq, Eq)]
 pub enum ConversionErrorKind {
     /// The literal failed to be escaped, take a look at [`EscapeError`] for more information.
     FailedToUnescape(EscapeError),