fix: no crash on singleton match patterns

Author: jvllmr

src/unparser.rs

@@ -1327,7 +1327,7 @@ impl Unparser {
     }
 
     fn unparse_pattern_match_singleton(&mut self, node: &PatternMatchSingleton<TextRange>) {
-        self.write_str(node.value.as_str().unwrap())
+        self._unparse_constant(&node.value);
     }
 
     fn unparse_pattern_match_sequence(&mut self, node: &PatternMatchSequence<TextRange>) {

test_files/match.py

@@ -8,6 +8,8 @@ class MatchThis:
 
 
 match {name_5: name_2}:
+    case None:
+        pass
     case [value_1, *rest] if []:
         print(value_1, *rest)
     case (value_1, *rest) if []: