ra_syntax: remove message() method and use only Display trait in SyntaxError as per matklad

crates/ra_syntax/src/lib.rs

@@ -115,7 +115,7 @@ impl Parse<SourceFile> {
     pub fn debug_dump(&self) -> String {
         let mut buf = format!("{:#?}", self.tree().syntax());
         for err in self.errors.iter() {
-            writeln!(buf, "error {:?}: {}", err.range(), err.message()).unwrap();
+            writeln!(buf, "error {:?}: {}", err.range(), err).unwrap();
         }
         buf
     }

crates/ra_syntax/src/syntax_error.rs

@@ -27,9 +27,6 @@ impl SyntaxError {
         Self(message.into(), TextRange::offset_len(offset, 0.into()))
     }
 
-    pub fn message(&self) -> &str {
-        &self.0
-    }
     pub fn range(&self) -> TextRange {
         self.1
     }