fix export of keyword and redirection

fixes #2141
fixes #2142

lib/parse.js

@@ -2327,6 +2327,14 @@ function parse($TEXT, options) {
     }
 
     function map_name(is_import) {
+        function make_symbol(type) {
+            return new type({
+                name: as_property_name(),
+                start: prev(),
+                end: prev()
+            });
+        }
+
         var foreign_type = is_import ? AST_SymbolImportForeign : AST_SymbolExportForeign;
         var type = is_import ? AST_SymbolImport : AST_SymbolExport;
         var start = S.token;
@@ -2334,16 +2342,16 @@ function parse($TEXT, options) {
         var name;
 
         if (is_import) {
-            foreign_name = as_symbol(foreign_type);
+            foreign_name = make_symbol(foreign_type);
         } else {
-            name = as_symbol(type);
+            name = make_symbol(type);
         }
         if (is("name", "as")) {
             next();  // The "as" word
             if (is_import) {
-                name = as_symbol(type);
+                name = make_symbol(type);
             } else {
-                foreign_name = as_symbol(foreign_type);
+                foreign_name = make_symbol(foreign_type);
             }
         } else if (is_import) {
             name = new type(foreign_name);

lib/scope.js

@@ -263,8 +263,9 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                     s.uses_eval = true;
                 }
             }
-            var sym = node.scope.find_variable(name);
+            var sym;
-            if (!sym) {
+            if (tw.parent() instanceof AST_NameMapping && tw.parent(1).module_name
+                || !(sym = node.scope.find_variable(name))) {
                 sym = self.def_global(node);
             } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
                 sym.scope.uses_arguments = true;

test/compress/export.js

@@ -154,3 +154,45 @@ issue_2134_2: {
         Foo.prototype = {};
     }
 }
+
+redirection: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        let foo = 1;
+        export { foo as var };
+        export { foo as var } from "module.js";
+    }
+    expect: {
+        let o = 1;
+        export { o as var };
+        export { foo as var } from "module.js";
+    }
+}
+
+keyword_invalid: {
+    input: {
+        export { default };
+        export { default as Alias };
+        export { default as default };
+    }
+    expect: {
+        export { default };
+        export { default as Alias };
+        export { default as default };
+    }
+}
+
+keyword_valid: {
+    input: {
+        export { default } from "module.js";
+        export { default as Alias } from "module.js";
+        export { default as default } from "module.js";
+    }
+    expect: {
+        export { default } from "module.js";
+        export { default as Alias } from "module.js";
+        export { default as default } from "module.js";
+    }
+}