[update] Allowed a parser to parse the first term with minus.

sjscript/src/sjscript/parse.d

@@ -120,6 +120,10 @@ private class RuleSet {
   static Expression ParseExpressionFromFirstTerm(Term term) {
     return Expression([term]);
   }
+  static Expression ParseExpressionFromFirstNegativeTerm(
+      @(TokenType.Sub) Token, Term term) {
+    return Expression([term * -1f]);
+  }
   static Expression ParseExpressionFromFollowingAddedTerm(
       Expression expr, @(TokenType.Add) Token, Term term) {
     return expr + term;

sjscript/test/test02.sj

@@ -2,6 +2,6 @@ $define beat {0}
 
 $repeat i 100 {
   A [$i*5+$beat..($i+1)*5+$beat] {
-    damage = 1;
+    damage = -1;
   }
 }