Do not re-use ID twice in exists_one macro

PiperOrigin-RevId: 629906268

Author: l46kok

parser/src/main/java/dev/cel/parser/CelStandardMacro.java

@@ -170,20 +170,22 @@ private static Optional<CelExpr> expandExistsOneMacro(
       return Optional.of(reportArgumentError(exprFactory, arg0));
     }
     CelExpr arg1 = checkNotNull(arguments.get(1));
-    CelExpr zeroExpr = exprFactory.newIntLiteral(0);
-    CelExpr oneExpr = exprFactory.newIntLiteral(1);
-    CelExpr accuInit = zeroExpr;
+    CelExpr accuInit = exprFactory.newIntLiteral(0);
     CelExpr condition = exprFactory.newBoolLiteral(true);
     CelExpr step =
         exprFactory.newGlobalCall(
             Operator.CONDITIONAL.getFunction(),
             arg1,
             exprFactory.newGlobalCall(
-                Operator.ADD.getFunction(), exprFactory.newIdentifier(ACCUMULATOR_VAR), oneExpr),
+                Operator.ADD.getFunction(),
+                exprFactory.newIdentifier(ACCUMULATOR_VAR),
+                exprFactory.newIntLiteral(1)),
             exprFactory.newIdentifier(ACCUMULATOR_VAR));
     CelExpr result =
         exprFactory.newGlobalCall(
-            Operator.EQUALS.getFunction(), exprFactory.newIdentifier(ACCUMULATOR_VAR), oneExpr);
+            Operator.EQUALS.getFunction(),
+            exprFactory.newIdentifier(ACCUMULATOR_VAR),
+            exprFactory.newIntLiteral(1));
     return Optional.of(
         exprFactory.fold(
             arg0.ident().name(), target, ACCUMULATOR_VAR, accuInit, condition, step, result));

parser/src/test/resources/parser.baseline

@@ -739,21 +739,21 @@ P: __comprehension__(
   // Init
   0^#5:int64#,
   // LoopCondition
-  true^#7:bool#,
+  true^#6:bool#,
   // LoopStep
   _?_:_(
     f^#4:Expr.Ident#,
     _+_(
-      __result__^#8:Expr.Ident#,
-      1^#6:int64#
+      __result__^#7:Expr.Ident#,
+      1^#8:int64#
     )^#9:Expr.Call#,
     __result__^#10:Expr.Ident#
   )^#11:Expr.Call#,
   // Result
   _==_(
     __result__^#12:Expr.Ident#,
-    1^#6:int64#
-  )^#13:Expr.Call#)^#14:Expr.Comprehension#
+    1^#13:int64#
+  )^#14:Expr.Call#)^#15:Expr.Comprehension#
 L: __comprehension__(
   // Variable
   v,
@@ -764,21 +764,21 @@ L: __comprehension__(
   // Init
   0^#5[1,12]#,
   // LoopCondition
-  true^#7[1,12]#,
+  true^#6[1,12]#,
   // LoopStep
   _?_:_(
     f^#4[1,16]#,
     _+_(
-      __result__^#8[1,12]#,
-      1^#6[1,12]#
+      __result__^#7[1,12]#,
+      1^#8[1,12]#
     )^#9[1,12]#,
     __result__^#10[1,12]#
   )^#11[1,12]#,
   // Result
   _==_(
     __result__^#12[1,12]#,
-    1^#6[1,12]#
-  )^#13[1,12]#)^#14[1,12]#
+    1^#13[1,12]#
+  )^#14[1,12]#)^#15[1,12]#
 M: m^#1:Expr.Ident#.exists_one(
   v^#3:Expr.Ident#,
   f^#4:Expr.Ident#