Test case for #1702 - missing scope in references when used in "for".

test/mocha/forReferences-issue1702.js

@@ -0,0 +1,25 @@
+var uglify = require('../../');
+var assert = require("assert");
+
+describe("For statement", function() {
+    it("For variable should list enclosing scope in its references (issue #17022)", function() {
+        var ast = uglify.parse("function f() { var a = 0; for (; a < 10; a++) {} }");
+        ast.figure_out_scope();
+
+        var checkedAST_VarDef = false;
+        var checkWalker = new uglify.TreeWalker(function(node, descend) {
+            if (node instanceof uglify.AST_VarDef) {
+                checkedAST_VarDef = true;
+                // one reference should be in the AST_Defun scope - search for it
+                var foundDefun = false;
+                node.name.thedef.references.forEach(function (r) {
+                    if (r instanceof uglify.AST_Defun) foundDefun = true;
+                });
+
+                assert(foundDefun, "Symbol not referenced in the AST_Defun scope");
+            }
+        });
+        ast.walk(checkWalker);
+        assert(checkedAST_VarDef, "AST_VarDef not found");
+    });
+});