typo

book.tex

@@ -2139,7 +2139,7 @@ class InterpLint:
         self.interp_exp(value, env)
         return self.interp_stmts(ss[1:], env)
 
-  def interp_P(self, p):
+  def interp(self, p):
     match p:
       case Module(body):
         self.interp_stmts(body, {})