silence some warnings that were driving me crazy

lalrpop-test/src/generics_issue_104.lalrpop

@@ -1,4 +1,3 @@
-use lalrpop_util::ParseError;
 use generics_issue_104_lib::Generator;
 
 grammar<T> where T: Generator;

lalrpop-test/src/util/tok.rs

@@ -13,6 +13,7 @@ pub enum Tok {
     Times,
     Div,
     Comma,
+    #[allow(dead_code)]
     Fraction(i32, i32), // Not produced by tokenizer, used only in regression tests for #179
 }