Skylark: Allow list slices

--
MOS_MIGRATED_REVID=88727892
diff --git a/src/test/java/com/google/devtools/build/lib/syntax/ParserTest.java b/src/test/java/com/google/devtools/build/lib/syntax/ParserTest.java
index 0e69eff..e08f6d4 100644
--- a/src/test/java/com/google/devtools/build/lib/syntax/ParserTest.java
+++ b/src/test/java/com/google/devtools/build/lib/syntax/ParserTest.java
@@ -214,7 +214,7 @@
   @Test
   public void testSubstring() throws Exception {
     FuncallExpression e = (FuncallExpression) parseExpr("'FOO.CC'[:].lower()[1:]");
-    assertEquals("$substring", e.getFunction().getName());
+    assertEquals("$slice", e.getFunction().getName());
     assertThat(e.getArguments()).hasSize(2);
 
     e = (FuncallExpression) parseExpr("'FOO.CC'.lower()[1:].startswith('oo')");
@@ -222,7 +222,7 @@
     assertThat(e.getArguments()).hasSize(1);
 
     e = (FuncallExpression) parseExpr("'FOO.CC'[1:][:2]");
-    assertEquals("$substring", e.getFunction().getName());
+    assertEquals("$slice", e.getFunction().getName());
     assertThat(e.getArguments()).hasSize(2);
   }