Allow creation and modification of scopes in GN.

tools/gn/parser_unittest.cc

Index: tools/gn/parser_unittest.cc
diff --git a/tools/gn/parser_unittest.cc b/tools/gn/parser_unittest.cc
index 39703737a2a8af393cf6b4a60b7c4d07640616d0..6caeeb4079463bbbd162c9ed07c86feb5cb30762 100644
--- a/tools/gn/parser_unittest.cc
+++ b/tools/gn/parser_unittest.cc
@@ -246,8 +246,14 @@ TEST(Parser, Accessor) {
                     "    b\n"
                     "    IDENTIFIER(c)\n"
                     "   LITERAL(2)\n");
+  DoParserPrintTest("a.b = 5",
+                    "BLOCK\n"
+                    " BINARY(=)\n"
+                    "  ACCESSOR\n"
+                    "   a\n"
+                    "   IDENTIFIER(b)\n"
+                    "  LITERAL(5)\n");
   DoParserErrorTest("a = b.c.d", 1, 6);  // Can't nest accessors (currently).
-  DoParserErrorTest("a.b = 5", 1, 1);  // Can't assign to accessors (currently).
 
   // Error at the bad dot in the RHS, not the + operator (crbug.com/472038).
   DoParserErrorTest("foo(a + b.c.d)", 1, 10);
@@ -701,11 +707,38 @@ TEST(Parser, ConditionNoBracesElseIf) {
 // a function with an associated block, or a standalone function with a
 // freestanding block.
 TEST(Parser, StandaloneBlock) {
+  // The error is reported at the end of the block when nothing is done
+  // with it. If we had said "a = { ..." then it would have been OK.
   DoParserErrorTest(
       "if (true) {\n"
       "}\n"
       "{\n"
       "  assert(false)\n"
       "}\n",
-      3, 1);
+      5, 1);
+}
+
+TEST(Parser, BlockValues) {
+  const char* input =
+    "print({a = 1 b = 2}, 3)\n"
+    "a = { b = \"asd\" }";
+  const char* expected =
+    "BLOCK\n"
+    " FUNCTION(print)\n"
+    "  LIST\n"
+    "   BLOCK\n"
+    "    BINARY(=)\n"
+    "     IDENTIFIER(a)\n"
+    "     LITERAL(1)\n"
+    "    BINARY(=)\n"
+    "     IDENTIFIER(b)\n"
+    "     LITERAL(2)\n"
+    "   LITERAL(3)\n"
+    " BINARY(=)\n"
+    "  IDENTIFIER(a)\n"
+    "  BLOCK\n"
+    "   BINARY(=)\n"
+    "    IDENTIFIER(b)\n"
+    "    LITERAL(\"asd\")\n";
+  DoParserPrintTest(input, expected);
 }