fix non-string property key

avoid unused variable

lib/compress.js

@@ -2693,7 +2693,10 @@ merge(Compressor.prototype, {
         self.enclosed.forEach(function(def) {
             var_names[def.name] = true;
         });
-        var tt = new TreeTransformer(function(node) {
+        self.variables.each(function(def, name) {
+            var_names[name] = true;
+        });
+        return self.transform(new TreeTransformer(function(node) {
             if (node instanceof AST_VarDef) {
                 var sym = node.name, def, value;
                 if (sym.scope === self
@@ -2731,7 +2734,7 @@ merge(Compressor.prototype, {
             }
 
             function make_sym(key) {
-                var prefix = sym.name + "_" + key.replace(/[^a-z_$]+/ig, "_");
+                var prefix = sym.name + "_" + key.toString().replace(/[^a-z_$]+/ig, "_");
                 var name = prefix;
                 for (var i = 0; var_names[name]; i++) name = prefix + "$" + i;
                 var new_var = make_node(sym.CTOR, sym, {
@@ -2744,8 +2747,7 @@ merge(Compressor.prototype, {
                 var_names[name] = true;
                 return new_var;
             }
-        });
+        }));
-        return self.transform(tt);
     });
 
     // drop_side_effect_free()

test/compress/hoist_props.js

@@ -184,7 +184,7 @@ single_use: {
     }
 }
 
-name_collision: {
+name_collision_1: {
     options = {
         reduce_vars: true,
         hoist_props: true,
@@ -220,3 +220,69 @@ name_collision: {
     }
     expect_stdout: "1 3 4 5 6 7"
 }
+
+name_collision_2: {
+    options = {
+        reduce_vars: true,
+        hoist_props: true,
+        toplevel: true,
+    }
+    input: {
+        var o = {
+            p: 1,
+            0: function(x) {
+                return x;
+            },
+            1: function(x) {
+                return x + 1;
+            }
+        }, o__$0 = 2, o__$1 = 3;
+        console.log(o.p === o.p, o[0](4), o[1](5), o__$0, o__$1);
+    }
+    expect: {
+        var o_p = 1,
+            o__ = function(x) {
+                return x;
+            },
+            o__$2 = function(x) {
+                return x + 1;
+            },
+            o__$0 = 2,
+            o__$1 = 3;
+        console.log(o_p === o_p, o__(4), o__$2(5), o__$0, o__$1);
+    }
+    expect_stdout: "true 4 6 2 3"
+}
+
+name_collision_3: {
+    options = {
+        reduce_vars: true,
+        hoist_props: true,
+        toplevel: true,
+    }
+    input: {
+        var o = {
+            p: 1,
+            0: function(x) {
+                return x;
+            },
+            1: function(x) {
+                return x + 1;
+            }
+        }, o__$0 = 2, o__$1 = 3;
+        console.log(o.p === o.p, o[0](4), o[1](5));
+    }
+    expect: {
+        var o_p = 1,
+            o__ = function(x) {
+                return x;
+            },
+            o__$2 = function(x) {
+                return x + 1;
+            },
+            o__$0 = 2,
+            o__$1 = 3;
+        console.log(o_p === o_p, o__(4), o__$2(5));
+    }
+    expect_stdout: "true 4 6"
+}